Crown Castle Inc.

Zayo operates one of the most comprehensive fiber backbones across North America, offering dense metro fiber, extensive intercity dark fiber routes, and scalable 10G to 400G+ wavelength transport optimized for enterprise data center interconnect and hyperscale workloads.

Lumen maintains an expansive North American ultra-low-loss fiber footprint and Tier-1 IP backbone, offering high-capacity point-to-point wavelength services up to 400G and customizable dark fiber for enterprise WAN, AI workloads, and mission-critical cloud interconnects.

Operating AS1299—one of the world's most connected Tier-1 global IP backbones—Arelion provides carrier-grade DWDM wavelength services, global IP transit, and high-performance inter-data center transport across major North American metropolitan and long-haul corridors.

Uniti provides extensive long-haul and regional dark fiber and high-capacity wavelength transport across the Central and Southeastern United States, specifically tailored for enterprise DCI, carrier wholesale, and AI network interconnects.

Cogent operates a widespread multinational optical IP network connecting thousands of carrier-neutral data centers, providing high-bandwidth Optical Wave Services and high-capacity IP transit tailored for cost-effective enterprise DCI and backbone traffic.

AT&T Business provides ubiquitous enterprise optical infrastructure across North America, featuring metro and long-haul wavelength services up to 400G and private optical line services connecting enterprise sites to key carrier-neutral data centers and cloud on-ramps.

Verizon offers high-availability optical wave services, dark fiber, and Tier-1 IP transit across a vast US footprint, engineered to support latency-sensitive enterprise WAN architectures and high-throughput data center replication workloads.

FiberLight designs and operates custom, high-strand-count metro and regional dark fiber and wavelength transport networks throughout Texas and the Southeast, offering low-latency, physically diverse paths between key data centers and enterprise campuses.

FirstLight provides dense optical infrastructure and carrier-grade transport across the Northeast and Mid-Atlantic regions, offering low-latency wavelength and dark fiber links connecting key regional enterprise locations and colocation facilities.

Operates extensive long-haul and metro dark fiber across North America and Western Europe, offering high-count dark fiber pairs and 400G+ wavelength transport purpose-built for hyperscale and enterprise data center interconnect.

Controls one of North America's largest intercity fiber backbones with extensive transatlantic routes, providing next-generation ultra-low-loss dark fiber and 400G optical wavelengths connecting thousands of commercial and colocation data centers.

Provides dense pan-European long-haul networks and metro fiber rings connecting over 1,000 data centers, supporting both raw dark fiber IRUs and fully transparent high-speed optical wavelength services across Europe and transatlantic paths.

Operates a global Tier-1 optical backbone across North America and Europe, delivering point-to-point 400GE/DWDM wavelength connectivity and selective long-haul dark fiber routes optimized for low latency between carrier-neutral facilities.

Specializes heavily in Western European data center interconnect, engineering custom high-count dark fiber superhighways and long-haul wavelength infrastructure connecting major cloud clusters across cities like Frankfurt, London, Amsterdam, and Paris.

Maintains dedicated European and transatlantic digital infrastructure, supplying hyperscalers and wholesale carriers with extensive long-haul dark fiber routes, subsea cable connectivity, and 400G wavelength capacity.

Delivers comprehensive national long-haul and regional dark fiber and high-capacity wavelength transport across the United States, linking tier-1 and tier-2 data center clusters, subsea landing stations, and enterprise aggregation points.

Provides long-haul, intercity optical wave transport and high-bandwidth interconnects across both North America and Europe, targeting carrier-neutral data centers with predictable-latency transparent wavelength channels.

Maintains a massive global optical network supplying dedicated long-haul optical wavelength links up to 400G and selective dark fiber infrastructure for hyperscale interconnects, enterprise private backbones, and carrier handoffs.