Top 200 Dark Fiber and Lit Fiber Providers in the World

Globally, the top 200 dark fiber and lit fiber providers deliver connectivity services to businesses through fiber optic networks that span millions of miles around the world. These business-to-business (B2B) fiber companies connect various types of facilities, from office buildings to cell towers, and data centers to stadiums. Commonly referred to as dark fiber and lit fiber providers, these companies are also known as carriers of carriers. They offer solutions under various terminologies, including unlit fiber, wholesale fiber, bulk fiber, carrier fiber, enterprise fiber, and business fiber.

In total, the 10 most prominent dark fiber and lit fiber providers in the world, including Lumen, Zayo, Colt Technology Services, Cogent, EXA Infrastructure, Arelion, Telecom Italia (TIM) / Sparkle, NTT, AT&T, and Verizon, collectively operate over 4 million route miles of fiber optic network.

Dgtl Infra has categorized the largest 200 dark fiber and lit fiber providers in the world into 6 groups based on their geographic operating region and several measurable market share factors, including: fiber network size (route miles and strand miles), number of on-net buildings (including data centers and cell towers), and revenue in U.S. Dollars, among others. Our list encompasses both independent dark fiber and lit fiber providers as well as telecommunications companies that offer these services as part of their broader business.

Subsequently, we delve deeper into the businesses and networks of 30 notable dark fiber and lit fiber providers, particularly focusing on companies operating in the United States, Europe, and Latin America. This analysis includes information about the length of their network in fiber route miles, the geographical areas where they serve their customers, and the type of provider they are (dark, lit, or a combination of both).

Top 200 Dark Fiber and Lit Fiber Providers in the World

The top 200 dark fiber and lit fiber providers in the world are categorized into the following geographic segments: multiple regions, North America, Europe, Asia Pacific, Latin America, and the Middle East and Africa.

It is important to note that Dgtl Infra’s list focuses on facilities-based providers of fiber networks, who own and operate their own physical infrastructure, as opposed to relying on leasing or reselling capacity from other network owners to deliver services. Additionally, we exclude companies operating primarily in China and Russia, as well as businesses that mainly own subsea cables, as opposed to terrestrial dark fiber and lit fiber, which our list focuses on.

Multiple Regions

#	Fiber Provider	Type	Key Locations
1	Lumen Technologies	Dark / Lit	United States, Europe, Asia
2	Zayo Group	Dark / Lit	United States, Europe
3	Colt Technology Services	Dark / Lit	Europe, United States, Asia
4	Cogent Communications	Dark / Lit	United States, Europe, LatAm, Asia
5	EXA Infrastructure	Dark / Lit	Europe, United States
6	Arelion	Dark / Lit	Europe, United States, Asia

North America

#	Fiber Provider	Type	Key Countries
7	AT&T	Lit	United States
8	Verizon	Lit	United States
9	Charter Communications (Spectrum Enterprise)	Lit	United States
10	Frontier Communications	Lit	United States
11	Windstream Holdings	Dark / Lit	United States
12	Comcast Business	Lit	United States
13	Uniti Group	Dark / Lit	United States
14	Crown Castle	Dark / Lit	United States
15	Rogers Communications (incl. Shaw)	Lit	Canada
16	Consolidated Communications	Dark / Lit	United States
17	Astound Broadband	Dark / Lit	United States
18	Fusion Connect	Lit	United States
19	Cox Business (incl. Segra)	Lit	United States
20	Everstream Solutions	Dark / Lit	United States
21	FirstLight	Dark / Lit	United States
22	altafiber (Cincinnati Bell)	Lit	United States
23	Lightpath (Altice USA)	Lit	United States
24	Ziply Fiber	Dark / Lit	United States
25	Alaska Communications	Dark / Lit	United States
26	Mediacom Business	Lit	United States
27	FiberLight	Dark / Lit	United States
28	Great Plains Communications	Lit	United States
29	Sparklight Business (Cable One)	Dark / Lit	United States
30	BCE (Bell Canada)	Lit	Canada
31	Arvig	Dark / Lit	United States
32	TDS Telecom	Lit	United States
33	Conterra Networks	Dark / Lit	United States
34	Midco (Midcontinent Communications)	Lit	United States
35	Unite Private Networks	Dark / Lit	United States
36	Bluebird Network	Dark / Lit	United States
37	C Spire Business	Lit	United States
38	US Signal	Dark / Lit	United States
39	Telus	Lit	Canada
40	Shentel (Shenandoah Telecommunications)	Dark / Lit	United States
41	LS Networks	Dark / Lit	United States
42	WideOpenWest (WOW!) Business	Dark / Lit	United States
43	LOGIX Fiber Networks	Dark / Lit	United States
44	Cogeco (incl. Breezeline)	Lit	Canada, United States
45	Clearwave Fiber	Lit	United States
46	Horizon Telcom	Lit	United States
47	PS Lightwave (Pure Speed Lightwave)	Dark / Lit	United States
48	Vidéotron (incl. Fibrenoire)	Dark / Lit	Canada
49	Armstrong Business Solutions	Dark / Lit	United States
50	Ritter Communications	Dark / Lit	United States
51	DQE Communications	Dark / Lit	United States
52	Beanfield Metroconnect	Lit	Canada
53	Extenet	Dark	United States
54	Summit Broadband	Dark / Lit	United States
55	NoaNet (Northwest Open Access Network)	Lit	United States
56	Hunter Communications	Lit	United States
57	Metronet Business	Lit	United States
58	Douglas Fast Net (DFN)	Lit	United States
59	ACD.NET (Advanced Comms & Data)	Lit	United States
60	Boldyn Networks (BAI, Mobilitie, ZenFi)	Dark / Lit	United States
61	FirstDigital Telecom	Dark / Lit	United States
62	Mid-Atlantic Broadband (MBC)	Dark / Lit	United States
63	Race Communications	Lit	United States
64	Syringa Networks	Lit	United States
65	Silver Star Communications	Dark / Lit	United States
66	Fatbeam	Dark / Lit	United States
67	WANRack	Dark / Lit	United States
68	SummitIG	Dark	United States
69	United Fiber & Data	Dark / Lit	United States
70	CentraCom	Lit	United States
71	ResurgenceIG	Dark	United States
72	Bandwidth IG	Dark	United States
73	Dark Fiber and Infrastructure (DF&I)	Dark	United States
74	Pilot Fiber	Dark / Lit	United States
75	3Red8	Dark	United States
76	Accelecom	Dark / Lit	United States

Europe

#	Fiber Provider	Type	Key Countries
77	Deutsche Telekom	Lit	Germany, Poland, Czech Republic
78	Vodafone	Lit	United Kingdom, Germany, Spain, Italy
79	Orange	Lit	France, Spain, Belgium, Poland
80	Telefónica	Lit	Spain, Germany, United Kingdom
81	BT Group (British Telecom)	Lit	United Kingdom
82	Telecom Italia (TIM) / Sparkle	Dark / Lit	Italy
83	KPN	Dark / Lit	Netherlands
84	Liberty Global	Lit	United Kingdom, Ireland, Belgium
85	GlobalConnect	Dark / Lit	Sweden, Norway, Denmark, Germany
86	Telenor Group	Lit	Norway, Sweden, Denmark, Finland
87	Telekom Austria Group (A1)	Lit	Austria, Belarus, Bulgaria, Croatia
88	Eurofiber	Dark	Netherlands, Belgium, France
89	Fastweb	Dark / Lit	Italy
90	1&1 Versatel	Lit	Germany
91	Reintel (Redeia)	Dark	Spain
92	Türk Telekom	Lit	Turkey
93	euNetworks	Dark	Europe
94	RETN	Lit	Europe, Asia
95	lyntia Networks	Dark / Lit	Spain
96	Retelit and Irideos	Dark / Lit	Italy
97	Swisscom	Lit	Switzerland
98	Deutsche Glasfaser	Lit	Germany
99	Relined	Dark	Germany, Netherlands, Denmark
100	Neos Networks	Dark / Lit	United Kingdom
101	Aire Networks	Dark	Spain
102	GasLINE	Dark	Germany
103	MyNet	Lit	Italy
104	Sipartech	Dark/Lit	France, Spain, Germany, Belgium, UK
105	DB broadband	Dark	Germany
106	Proximus	Lit	Belgium
107	Elisa Corporation	Lit	Finland, Estonia
108	Altice Europe	Lit	France, Portugal
109	Bouygues	Lit	France
110	Iliad SA	Lit	France, Italy
111	TDC NET	Lit	Denmark
112	Exponential-e	Lit	United Kingdom
113	NGN Fiber Network	Dark / Lit	Germany
114	NetCom BW (EnBW Group)	Lit	Germany
115	Iberfibra	Dark	Spain
116	Adif AV (Telecommunications)	Dark	Spain
117	Celeste	Dark / Lit	France
118	MÁSMÓVIL	Dark / Lit	Spain
119	KCOM	Dark / Lit	United Kingdom
120	Axent (Axión)	Dark	Spain
121	Alliander Telecom	Dark	Netherlands
122	CityFibre	Dark / Lit	United Kingdom
123	TReNT Glasvezel	Dark	Netherlands
124	ewz	Dark / Lit	Switzerland
125	Tampnet	Dark / Lit	North Sea, Gulf of Mexico

Asia Pacific

#	Fiber Provider	Type	Key Countries
126	NTT Communications	Lit	Japan
127	HGC Global Communications	Lit	Hong Kong
128	BSNL / BBNL	Lit	India
129	KDDI Corporation	Lit	Japan
130	KT Corporation (Korea Telecom)	Lit	South Korea
131	Chunghwa Telecom	Lit	Taiwan
132	Reliance Jio / Reliance Infratel	Lit	India
133	Telstra	Dark / Lit	Australia
134	Telesonic Networks (Bharti Airtel)	Lit	India
135	Vodafone Idea	Dark / Lit	India
136	PLDT	Lit	Philippines
137	Singtel	Lit	Singapore
138	Tata Teleservices	Lit	India
139	POWERGRID	Dark / Lit	India
140	RailTel	Dark / Lit	India
141	Tata Communications	Lit	India
142	Optus	Dark / Lit	Australia
143	TPG Telecom	Dark / Lit	Australia
144	CAT Telecom	Lit	Thailand
145	StarHub	Lit	Singapore
146	SPTel (Singapore Power)	Dark / Lit	Singapore
147	Sify Technologies	Dark / Lit	India
148	Vocus Group	Dark / Lit	Australia, New Zealand
149	PCCW Global	Lit	Hong Kong
150	HKBN (Hong Kong Broadband)	Lit	Hong Kong
151	Advanced Info Service (AIS)	Lit	Thailand
152	Indosat Ooredoo	Lit	Indonesia
153	LG Uplus	Lit	South Korea
154	Globe Telecom	Lit	Philippines
155	TM One (Telekom Malaysia)	Lit	Malaysia
156	XL Axiata	Lit	Indonesia
157	MyRepublic	Lit	Singapore, Indonesia, New Zealand
158	One New Zealand (Vodafone)	Lit	New Zealand
159	SK Telecom	Lit	South Korea
160	Aircel	Lit	India
161	BB Backbone (SoftBank)	Dark	Japan
162	QCN Fibre	Dark / Lit	Australia
163	SEJONG Telecom	Lit	South Korea
164	TOKAI Communications	Lit	Japan
165	ARTERIA Networks	Dark / Lit	Japan
166	HyperOne	Dark	Australia
167	Aussie Broadband	Dark	Australia
168	Xenith IG	Dark	Hong Kong, Singapore, Australia

Latin America

#	Fiber Provider	Type	Key Countries
169	América Móvil (Claro, Telmex, Embratel)	Lit	17 Countries
170	Telefónica LatAm (Movistar, Vivo)	Lit	Brazil, Argentina, Colombia
171	Telecom Argentina	Lit	Argentina
172	TIM Brasil	Lit	Brazil
173	Ufinet International	Dark / Lit	Latin America, United States
174	Cirion Technologies	Dark / Lit	Latin America
175	Millicom (Tigo)	Lit	Latin America
176	Liberty Latin America	Lit	Chile, Panama, Caribbean
177	Axtel / Alestra	Lit	Mexico
178	GTD Group	Lit	Chile
179	Comisión Federal de Electricidad (CFE)	Dark	Mexico
180	Entel	Lit	Chile
181	ON*NET Fibra (KKR, Telefónica)	Dark / Lit	Chile
182	Wirelink	Dark	Brazil
183	ETB (Empresa de Telecomunicaciones)	Lit	Colombia
184	Totalplay	Lit	Mexico
185	ANTEL	Lit	Uruguay
186	Flo Networks	Lit	Mexico, United States
187	Algar Telecom	Lit	Brazil
188	Ascenty	Dark	Brazil, Mexico, Chile
189	Neutral Networks	Dark / Lit	Mexico

Middle East and Africa

#	Fiber Provider	Type	Key Countries
190	MTN (incl. MTN GlobalConnect)	Dark / Lit	Pan-Africa
191	Liquid Intelligent Technologies	Dark / Lit	Pan-Africa
192	Dark Fibre Africa (DFA)	Dark	South Africa
193	Saudi Telecom Company (stc)	Lit	Saudi Arabia
194	Maroc Telecom	Lit	Morocco
195	Etisalat	Lit	UAE, Saudi Arabia
196	Airtel Africa	Lit	Africa
197	Telkom SA	Lit	South Africa
198	Vodacom and Safaricom (Vodafone)	Lit	South Africa, Tanzania, Kenya
199	Zain Group	Lit	Kuwait, Bahrain, Iraq, Jordan
200	Ooredoo	Lit	Qatar, Oman, Kuwait

1. Lumen Technologies

Lumen Technologies (NYSE: LUMN) operates a global dark and lit fiber network, comprising both owned and leased infrastructure. The company’s network includes 400,000 route miles of fiber optic plant, which consists of 25,000 route miles of subsea fiber optic cable systems. This fiber network connects to 160,000 on-net buildings, positioning Lumen among the largest providers of lit communications services to domestic and global enterprise customers.

Lumen’s terrestrial and subsea fiber optic long-haul network spans across North America, Europe, and Asia Pacific, connecting to metropolitan fiber networks that the company operates. Additionally, Lumen manages multiple gateway and transmission facilities utilized in operating its network throughout North America and Europe.

2. Zayo Group

Zayo Group operates a dark and lit fiber network in the United States and Europe, spanning 139,000 route miles and over 16 million strand miles. This represents an average strand count of more than 115 strands per route mile.

Across 400 markets worldwide, Zayo’s network provides access to over 44,000 on-net buildings, more than 1,400 on-net data centers, and over 380 cloud on-ramps.

3. Colt Technology Services

Colt Technology Services operates a dark and lit fiber network that spans 32 countries, 212 cities, and 51 major metropolitan area networks in Europe, North America, and Asia Pacific. The company’s fiber network extends 187,000 kilometers (116,196 miles), connecting to over 29,000 buildings, more than 900 data centers, and over 200 cloud points-of-presence (PoPs).

4. Cogent Communications

Cogent Communications (NASDAQ: CCOI) operates a network backbone, leased on indefeasible right of use (IRU) contracts from 308 different dark fiber suppliers worldwide. The company’s network totals 78,908 route miles, which comprises 61,292 long-haul route miles and 17,616 metro route miles.

Cogent serves 1,264 carrier-neutral data center buildings (1,458 nodes) with its fiber network, and its network connects to 3,155 total on-net buildings, including 1,837 multi-tenant office buildings in major North American cities.

Additionally, Cogent is acquiring T-Mobile’s Wireline Business, which consists of 20,305 owned route miles, of which approximately 19,000 are long-haul route miles and around 1,300 are metro route miles. Furthermore, the unit possesses 16,843 leased route miles. This transaction transforms Cogent into a larger, facilities-based carrier through ownership of its own nationwide network.

5. EXA Infrastructure

EXA Infrastructure operates a dark and lit fiber network that spans 34 countries and over 300 cities in Europe and North America. The company’s fiber network extends 114,000 kilometers (70,836 miles), connecting to over 500 optical points-of-presence (PoPs), 13 Tier 3-equivalent data centers, and more than 270 edge and network colocation sites.

6. Arelion

Arelion operates a dark and lit fiber network in more than 125 countries across Europe, North America, and Asia Pacific. The company’s network spans 70,000 kilometers (43,496 miles) of its own fiber and over 350 points-of-presence (PoPs). Using DWDM and IP technology, Arelion’s fiber network allows users to connect directly to more than 2,500 wholesale customers.

7. Charter Communications (Spectrum Enterprise)

Charter Communications (NASDAQ: CHTR) operates a lit fiber network that spans more than 230,000 route miles from coast to coast in the United States, encompassing over 279,000 fiber-lit buildings. Through its Spectrum Enterprise division, Charter serves businesses nationwide by combining its large serviceable footprint with a portfolio of fiber-lit buildings and a significant wholesale partner network.

In terms of network technology, both Charter’s national backbone and regional/metro network components utilize a redundant IP ring/mesh fiber architecture.

8. Frontier Communications

Frontier Communications (NASDAQ: FYBR) operates a lit fiber network, consisting of over 180,000 route miles of fiber and 6,400 fiber-connected cell towers (serving 7,200 carrier cell sites on those towers) in the United States. The company also owns fiber optic cable, which is used as a transport technology between its central offices, remote facilities, and interconnection points with other telecommunications carriers.

9. Windstream Holdings

Windstream Holdings operates a nationwide dark and lit fiber network covering 170,000 route miles in the United States. Excluding assets associated with or encumbered by Uniti Group’s master lease agreements (MLAs), Windstream operates 84,000 route miles, of which 75% are owned by the company. Through this network, Windstream owns 1,338 points-of-presence (PoPs), with data transfer capacity at each of these PoPs of 100 gigabits per second (Gbps).

10. Comcast Business

Comcast Corporation (NASDAQ: CMCSA), through its division Comcast Business, operates a lit fiber footprint spanning 29 regional networks across 39 states in the U.S. The company’s fiber optic network consists of more than 150,000 miles of fiber, serving 18 of the top markets and providing high-speed services to numerous large companies.

11. Uniti Group

Uniti Group (NASDAQ: UNIT) owns and operates a dark and lit fiber network in the United States, spanning 135,000 route miles and 8.0 million strand miles. This represents an average strand count of 59.3 strands per route mile.

Uniti serves approximately 300 metro markets with its owned metro fiber or enterprise services, reaching over 275,000 on-net and near-net buildings.

READ MORE: Dark Fiber – What is it? and How Does it Work?

12. Crown Castle

Crown Castle (NYSE: CCI) owns and operates a dark and lit fiber network in the United States, consisting of 85,000 route miles of fiber primarily supporting its fiber solutions and small cells. The majority of the company’s fiber assets are located in major metropolitan areas, including a presence within every major U.S. market.

In terms of customers, Crown Castle’s dark and lit fiber network serves wireless carriers, wholesale carriers, educational institutions, healthcare providers, and financial services companies.

13. Consolidated Communications

Consolidated Communications (NASDAQ: CNSL) operates a dark and lit fiber network in the United States, spanning 57,865 route miles across numerous rural areas and metro communities. This network includes long-haul, metropolitan, and fiber-to-the-premises (FTTP) networks, connecting 14,427 lit or on-net buildings.

Through its dark and lit fiber network, Consolidated offers business products, such as data and internet solutions, as well as wholesale services to wireless and wireline carriers and other service providers. These services include network connections, custom fiber builds, and last-mile connections.

14. Astound Broadband

Astound Broadband owns and operates a dark and lit fiber network in the United States, spanning 31,000 route miles, which is concentrated in clusters across the country. Additionally, the company plans to add up to 1,500 more route miles every year to its fiber network.

Through its Astound Wholesale division, the company delivers solutions including wavelength, Ethernet, E-NNI (Ethernet Network-to-Network Interface), IP transit, dark fiber, cellular backhaul, VXC/VIX (Virtual Cross Connect/Virtual Internet Exchange), and private line.

15. Cox Business

Cox Business owns and operates a lit fiber network in the United States through its national fiber optic backbone, which comprises over 30,000 miles of metro fiber. The company operates a Multiprotocol Label Switching (MPLS) network over this backbone, enabled by fully redundant core routers deployed in each of its internet peering locations and regional data centers (RDCs). These core routers are interconnected to Cox’s backbone by multiple high-bandwidth connections.

Within Cox’s operations is the commercial enterprise and carrier business of Segra, a U.S. dark fiber and lit fiber provider, which Cox acquired in 2021.

16. Everstream Solutions

Everstream Solutions owns and operates dark and lit fiber networks in the United States, spanning more than 27,500 route miles. The company’s network traverses 10 states in the Midwest and Northeast, specifically Delaware, Illinois, Indiana, Kentucky, Michigan, Missouri, New Jersey, Ohio, Pennsylvania, and Wisconsin. Everstream’s fiber optic network connects to 5,790 on-net buildings, including 63 data centers.

17. FirstLight

FirstLight owns and operates dark and lit fiber networks in the United States, particularly in the Northeast and Mid-Atlantic regions. The company’s fiber network spans 25,000 route miles throughout Maine, Massachusetts, New Hampshire, New York, Pennsylvania, and Vermont. Additionally, FirstLight’s network connects nearly 13,000 lit locations with access to a further 125,000 locations.

18. altafiber (Cincinnati Bell)

altafiber, which is the brand that Cincinnati Bell does business under in Ohio, Kentucky, and Indiana, operates a lit fiber network in the United States totaling 20,400 route miles. The company’s fiber network spans more than 14,600 route miles in Greater Cincinnati and 5,800 route miles in Hawaii.

altafiber’s total number of commercial addresses with fiber-based services, known as lit addresses, stands at 36,200 in Greater Cincinnati and 27,300 in Hawaii. Additionally, the company provides cell site backhaul services to 90% of the 1,075 cell sites in the Greater Cincinnati market, all of which are lit with fiber, and 90% of the 1,120 cell sites in Hawaii, nearly all of which are lit with fiber.

19. Lightpath (Altice USA)

Lightpath, majority-owned by Altice USA (NYSE: ATUS), operates a lit fiber network in the United States, spanning 20,000 route miles and providing connectivity to 13,500 service locations and 2,000 wireless towers. The company offers products and services to both large enterprise customers and small and medium-sized businesses (SMBs), serving 381,200 SMB customers across its footprint.

Lightpath primarily serves the business market in the New York metropolitan area, offering Ethernet, data transport, IP-based virtual private networks, Internet access, telephony services, and VoIP services. The company has recently expanded into the Boston and Miami metropolitan areas. Lightpath’s bandwidth connectivity service delivers speeds of up to 100 gigabits per second (Gbps).

20. GlobalConnect

GlobalConnect owns and operates dark and lit fiber networks in Sweden, Norway, Denmark, Germany, and Finland. The company’s total fiber footprint spans over 155,000 kilometers (96,313 miles), of which more than 105,000 kilometers (65,244 miles) are wholly-owned. Through this network, GlobalConnect serves over 30,000 business-to-business (B2B) customers.

21. Eurofiber

Eurofiber owns and operates a dark fiber network in the Netherlands, Belgium, France, and Germany. The company’s network stretches over 61,700 kilometers (38,339 miles) and connects to over 12,000 locations. Eurofiber’s managed dark fiber connects to 215 data centers, of which 117 data centers have redundant connections.

22. Reintel (Redeia)

Reintel, a subsidiary of Redeia (formerly Red Eléctrica), an electric utility company in Spain, owns and operates a dark fiber network in Spain. The company’s fiber network spans 52,956 kilometers (32,905 miles) and is deployed along Redeia’s electricity transmission network as well as the rail network of Adif AV, Spain’s state-owned railway manager.

Additionally, Reintel offers colocation facilities and telecommunications shelters at 1,344 sites along its dark fiber network. Of this total, 810 are electricity grid sites and 534 are railway sites.

23. euNetworks

euNetworks owns and operates a dark fiber network spanning 45,800 kilometers (28,459 miles) throughout Western Europe. The company manages 17 fiber-based metropolitan networks across Western Europe, totaling 3,200 kilometers (1,988 miles), which are interconnected by its long-haul network of 42,600 kilometers (26,470 miles). Additionally, euNetworks’ fiber network directly connects to 2,539 locations, including over 510 data centers in Europe.

24. RETN

RETN operates a lit fiber network, which is 35% owned, with the remaining on long-term leases, connecting 40 countries in Europe and Asia Pacific. The company’s fiber optic network spans 45,500 kilometers (28,272 miles) and includes deep metro networks in certain cities.

RETN’s network connects to almost 900 on-net data centers and buildings worldwide, providing a comprehensive range of data transmission services. Geographically, many of RETN’s fiber routes and points-of-presence (PoPs) are located in Central and Eastern Europe (CEE), Russia, and Central Asia.

25. lyntia Networks

lyntia Networks owns and operates dark and lit fiber networks in Spain, particularly nationwide metro and long-haul fiber networks spanning 43,600 kilometers (27,092 miles). The company provides services to 4,011 towns and cities across Spain, including major cities like Madrid, Barcelona, Valencia, Seville, and Bilbao. This network connects to over 60,000 on-net buildings and is built primarily alongside electric power and gas distribution infrastructure of utility companies, including Naturgy, Iberdrola, and Endesa.

26. Retelit and Irideos

Retelit and Irideos own and operate dark and lit fiber networks in Italy, spanning 43,000 kilometers (26,719 miles). These soon-to-be-merged companies offer wholesale access and business-to-business (B2B) connectivity to customers, ranging from large telecommunications companies to small- and medium-sized businesses. Retelit and Irideos’ network traverses along motorways, the Adriatic coast, and through several metropolitan areas of Italy’s largest cities.

27. Relined

Relined operates a dark fiber network spanning 39,325 kilometers (24,435 miles) in Germany, the Netherlands, and Denmark. In these countries, the company offers complete national coverage and can establish connections to virtually any location. In areas where Relined does not own a fiber network, the company partners with various regional and local dark and lit fiber network providers, including TenneT, ProRail, BT, NGN, and Energienet.

28. Neos Networks

Neos Networks (formerly SSE Enterprise Telecoms) operates dark and lit fiber networks across the United Kingdom, spanning 34,000 kilometers (21,127 miles). The company’s network connects to 676 points-of-presence (PoPs) and over 90 data centers in the UK. Neos Networks’ business connectivity solutions, including dark fiber, Ethernet, optical wavelength, cloud connect, dedicated internet access, and WAN, all offer service with speeds of up to 100 gigabits per second (Gbps).

READ MORE: Dark Fiber in Europe and its Leading Network Providers

29. Ufinet International

Ufinet International owns and operates dark and lit fiber networks in Latin America and the United States. Collectively, across 17 countries and 2,210 towns and cities, Ufinet operates more than 100,000 kilometers (62,137 miles) of optical fiber, of which over 62,600 kilometers (38,898 miles) is owned fiber. The company’s fiber network connects to over 56,000 on-net buildings and more than 5,000 on-net towers.

Ufinet provides connectivity through backbone and access networks, backhaul and local loop, as well as national and international connections.

30. Cirion Technologies

Cirion Technologies (formerly Lumen’s LATAM business) owns and operates dark and lit fiber networks in Latin America. The company’s network spans 86,000 kilometers (53,438 miles) of terrestrial fiber and subsea cable routes, as well as 19 cable landing stations. Through its dark and lit fiber network, Cirion serves over 6,400 Latin America-based and multinational customers, including enterprises, government agencies, cloud service providers (CSPs), wireline and wireless carriers, and internet service providers (ISPs).

READ MORE: Dark Fiber and Enterprise Fiber Connect The Global Network