@ZayoGroup, the ~$20B fiber company, just published their 2025 bandwidth report. Key highlights: unsurprising: hyperscalers drove the majority of growth in "big deals" (>1TB waves capacity) surprising: manufacturers bought nearly as many fiber connections as telcos (carriers)

In just four years, Zayo's "400G" service (4x faster than the legacy 100G plan) has grown to half of all bandwidth sales and is now offered across the entirety of Zay'os network

Expected: Zayo's biggest markets are Phoenix, NYC, DC, Dallas (followed by Denver, Chicago, Atlanta) Unexpected: cities with datacenters represent the bulk of long-haul demand: Seattle and San Jose (45-55 datacenters each), Phoenix and Chicago (160+ datacenters each)

dark fiber purchases tripled in 2024 long-haul purchases grew +50% mostly driven by AI/datacenter/hyperscaler demand

link to full report: