Autonomous system
AS6461 ZAYO-6461
Transit ARIN
Summary
Zayo Group
transit backbone fiber
Zayo is a large fibre and IP-transit provider (ZAYO-6461), best known for its extensive metro and long-haul dark-fibre network across North America and Europe.
What it's used for
- IP transit and wavelength/dark-fibre services to carriers, data centers, hyperscalers, and enterprises.
- Backbone and metro connectivity underpinning many other networks.
Notable
- Zayo is primarily an infrastructure (fibre/transport) provider; a lot of its value is the physical routes, with IP transit layered on top.
- Its rDNS encodes PoP/city codes, making Zayo routers useful path landmarks.
Interesting
- Zayo assembled its footprint through dozens of acquisitions of regional fibre operators during the 2010s.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
Recorded at 52 exchanges in 18 countries, largest first.
| Exchange | Location | Their address |
|---|---|---|
| IX.br (PTT.br) São Paulo | São Paulo, Brazil | 187.16.209.48 |
| DE-CIX Frankfurt | Frankfurt, Germany | 80.81.194.26 |
| LINX LON1 | London, United Kingdom | 195.66.225.227 |
| AMS-IX Amsterdam | Amsterdam, Netherlands | 80.249.208.122 |
| Neutral Internet Exchange | Amsterdam, Netherlands | 193.239.119.162 |
| France-IX Paris | Paris, France | 37.49.237.147 |
| Equinix Internet Exchange Singapore | Singapore, Singapore | 27.111.230.52 |
| Milan Internet Exchange | Milan, Italy | 217.29.66.152 |
Transit providers
55 upstream, 2,539 downstream and 2,627 adjacent networks observed; most-used upstreams first.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-11, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 1,154 prefixes · 1.59M addresses IPv6 112 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 1,266 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS6461- Registry name
- ZAYO-6461
- Registrant
- Zayo Bandwidth
- Abuse contact
- abuse@zayo.com
- Registered
- 1996-04-22
- Last changed
- 2016-06-21
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 58% valid · 139 valid, 96 with no ROA 3 RPKI-invalid
- ROAs
- 274 authorising AS6461
- ASPA
- no ASPA record
- IRR
- 24% registered · 57 of 238 announcements 18 other origin
- Route objects
- 198 naming AS6461
Reputation
Classification and threat
Transit Tier-1 or major backbone carrying other networks’ traffic.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 431 networks and 1,768 prefixes, as published 2026-10-12. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere