ZAYO GROUP HOLDINGS, INC.

Zayo Bandwidth
Data as of 2026-08-16
GLEIF verified
LEI
529900Z6OTS7RT0V0I47
Registered name
ZAYO GROUP HOLDINGS, INC.
Jurisdiction
US-DE
Ultimate parent
No parent on file in GLEIF
Cluster stats
Netblocks2,066 · 3,733,904 IPv4 addresses
IPv6 360 prefixes (largest 2600:100::/28)
Registered in United States (1,706) · Canada (44) · United Kingdom (24) · Germany (14) · Netherlands (10) · France (6)
All fragments 2,471 blocks across 92 clusters
Cluster ID222371093
RegistryBGP
Owner jurisdictionUS-DE
Customersfind customers using this network →
Evidence & provenance ?
Attribution GLEIF legal-entity match
Legal identityLEI 529900Z6OTS7RT0V0I47
Shared handles clustered on 62 shared RIR contact/maintainer handles
Registry names 8 distinct registrant names across these blocks
full provenance (JSON) → · how attribution works · report an issue

Footprint over time

8 weekly snapshots · JSON
2,211 +1,302 netblocks since 2026-07-05
2026-07-05 peak 2,211 2026-08-16

IP Ranges (2,066)

showing 50 of 2,066 — see all — ⬇ export CSV (free export limited to 500 rows — subscribe for the full export)
CIDR Org name Registry Status Confidence
5.57.80.201/32 Zayo PEERINGDB ASSIGNED ● high
8.3.234.0/24 Zayo Bandwidth BGP ANNOUNCED ● high
23.247.180.0/24 Zayo Bandwidth BGP ANNOUNCED ● high
27.111.230.52/32 Zayo PEERINGDB ASSIGNED ● high
36.255.57.55/32 Zayo PEERINGDB ASSIGNED ● high
37.49.232.62/32 Zayo PEERINGDB ASSIGNED ● high
37.49.237.180/32 Zayo PEERINGDB ASSIGNED ● high
38.82.195.0/24 Zayo Bandwidth BGP ANNOUNCED ● high
38.82.200.0/22 Zayo Bandwidth BGP ANNOUNCED ● high
38.82.202.0/24 Zayo Bandwidth BGP ANNOUNCED ● high
38.82.203.0/24 Zayo Bandwidth BGP ANNOUNCED ● high
38.91.120.0/21 Zayo Bandwidth BGP ANNOUNCED ● high
38.91.122.0/24 Zayo Bandwidth BGP ANNOUNCED ● high
38.107.160.0/22 Zayo Bandwidth BGP ANNOUNCED ● high
38.107.162.0/24 Zayo Bandwidth BGP ANNOUNCED ● high
38.128.72.0/22 Zayo Bandwidth BGP ANNOUNCED ● high
38.128.72.0/24 Zayo Bandwidth BGP ANNOUNCED ● high
38.128.73.0/24 Zayo Bandwidth BGP ANNOUNCED ● high
38.128.76.0/22 Zayo Bandwidth BGP ANNOUNCED ● high
38.128.78.0/24 Zayo Bandwidth BGP ANNOUNCED ● high
38.128.79.0/24 Zayo Bandwidth BGP ANNOUNCED ● high
45.127.173.4/32 Zayo PEERINGDB ASSIGNED ● high
62.69.146.139/32 Zayo PEERINGDB ASSIGNED ● high
64.20.96.0/19 Zayo Bandwidth BGP ANNOUNCED ● high
64.20.160.0/19 Zayo Bandwidth BGP ANNOUNCED ● high
64.20.160.0/20 Zayo Bandwidth BGP ANNOUNCED ● high
64.20.168.0/24 Zayo Bandwidth BGP ANNOUNCED ● high
64.20.175.0/24 Zayo Bandwidth BGP ANNOUNCED ● high
64.20.176.0/20 Zayo Bandwidth BGP ANNOUNCED ● high
64.20.177.0/24 Zayo Bandwidth BGP ANNOUNCED ● high
64.20.178.0/24 Zayo Bandwidth BGP ANNOUNCED ● high
64.20.179.0/24 Zayo Bandwidth BGP ANNOUNCED ● high
64.20.180.0/24 Zayo Bandwidth BGP ANNOUNCED ● high
64.20.186.0/24 Zayo Bandwidth BGP ANNOUNCED ● high
64.20.187.0/24 Zayo Bandwidth BGP ANNOUNCED ● high
64.95.166.0/24 Zayo Bandwidth BGP ANNOUNCED ● high
64.124.127.0/24 Zayo Bandwidth BGP ANNOUNCED ● high
64.124.190.0 – 64.125.255.255 Zayo Bandwidth ARIN DIRECT ALLOCATION ● high
64.184.0.0/17 Zayo Bandwidth BGP ANNOUNCED ● high
64.184.1.0/24 Zayo Bandwidth BGP ANNOUNCED ● high
64.184.2.0/23 Zayo Bandwidth BGP ANNOUNCED ● high
64.184.105.0/24 Zayo Bandwidth BGP ANNOUNCED ● high
64.191.233.36/32 Zayo PEERINGDB ASSIGNED ● high
65.38.180.0/24 Zayo Group, LLC BGP ANNOUNCED ● high
66.45.192.0/19 Zayo Bandwidth BGP ANNOUNCED ● high
66.46.20.0/24 Zayo Bandwidth BGP ANNOUNCED ● high
66.46.26.0/24 Zayo Bandwidth BGP ANNOUNCED ● high
66.46.46.0/24 Zayo Bandwidth BGP ANNOUNCED ● high
66.46.47.0/24 Zayo Bandwidth BGP ANNOUNCED ● high
66.46.102.0/24 Zayo Bandwidth BGP ANNOUNCED ● high

IPv6 ranges (360)

showing the 15 largest allocations
CIDR
2600:100::/28
2a01:a9e0::/29
2a0b:7ec0::/29
2001:1910::/32
2001:438::/32
2001:4c8::/32
2604:1a00::/32
2604:200::/32
2604:ce00::/32
2604:e500::/32
2605:a700::/32
2605:a900::/32
2606:4000::/32
2606:8180::/32
2607:2b00::/32

Domains hosted in this network

what's this?
aarki.net mathtag.com broadcloudpbx.net cnbcfm.com synology.com bfsfcu.org fortinet.com gwmtracking.com threatlocker.com ciqtracking.com fmcna.com cvnt.net quickconnect.to ihost.com dealercenter.net infragistics.com carzing.com coretelligent.com deepgram.com sumnerschools.org

Customer-delegated space

how is this classified?
Unclassified 2,061 (99.8%)
Operator infrastructure (named) 105 (5.1%)
Customer access pools 45 (2.2%)

Network trust

what's this?
RPKI hygiene: D how networks compare →
27.4% of checked blocks have valid RPKI ROA coverage (548 of 2,000, sampled from 2,211)
Possible discrepancies (5)

These blocks are registered to Zayo Bandwidth but cryptographically authorized for a different, unrelated network (5 distinct holders) — often M&A history, multi-homing, or outsourced/managed hosting, occasionally worth a closer look.

2a0b:7ec0::/29 /29 authorized for AS206728 — Media Land LLC
2604:ce00::/32 /32 authorized for AS27425 — IdeaTek Telcom, LLC
199.36.64.0/22 /22 authorized for AS53256 — Mulberry Telecommunications
206.254.231.0/24 /24 authorized for AS3354 — University of Texas System
208.187.29.0/24 /24 authorized for AS7385 — Allstream Business US, LLC

NIC Handles

ABOVENET-MNT ABUSE5675-ARIN ABUSE5675-ARIN AS11074 AS11079 AS11359 AS11686 AS13555 AS13592 AS15290 AS16503 AS16657 +50 more