asn.dev

Autonomous system

AS17025 ZAYO-CUSTOMER-17025

Unclassified ARIN

IPv4 addresses 14.85K 42 prefixes
IPv6 prefixes 2 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 5 1 downstream
Flagged prefixes 0 none

Summary

Zayo Bandwidth

United States of America · AI-generated

transit leased enterprise education

ZAYO-CUSTOMER-17025 is operated by Zayo Bandwidth.

What it's used for

  • The address space carries a mix of enterprise and educational traffic, evidenced by registrants such as Northwest Nazarene University (netnames NNU-2, NNU-199-104), BAE Systems Inc. (BAE-SYSTEMS-INC), and Siemens Industry Inc., Building Technology Division (ABOV-Z00020-64-124-134-0-24).
  • With 14,592 IPv4 addresses announced across 42 prefixes and only 6 observed neighbours, the ratio suggests a transit or aggregation role rather than a large-scale access network, consistent with Zayo's infrastructure provider status.

Notable

  • Registrants vary significantly from the announcer, including Northwest Nazarene University, BAE Systems Inc., Lansing Technology, Escalate, Siemens Industry Inc., TERRASPRING, and Latisys-Denver, LLC, indicating the AS aggregates space for multiple distinct customers.
  • Zayo Bandwidth is the current holder, having acquired the assets of Level 3 Communications, which previously operated this AS number.
  • The inventory includes two IPv6 prefixes (2001:438:38::/48, 2001:438:8022::/48) alongside a fragmented IPv4 estate with many /24 blocks.

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

Full topology · Graph

Internet exchanges

No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.

Transit providers

5 upstream, 1 downstream and 9 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS6461Zayo Bandwidth2,361
AS15290Zayo Bandwidth118
AS11427Charter Communications Inc46
AS10753Level 3 Parent, LLC44
AS812Rogers Communications Canada Inc.42

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-15, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.

Address space

Summary

Shape and geography

IPv4 42 prefixes · 14.85K addresses IPv6 2 prefixes

CountryNamePrefixes
USUnited States of America44

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS17025
Registry name
ZAYO-CUSTOMER-17025
Registrant
Zayo Bandwidth
Abuse contact
abuse@zayo.com
Registered
2000-07-14
Last changed
2023-05-10
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
56% valid · 25 valid, 20 with no ROA
ROAs
49 authorising AS17025
ASPA
no ASPA record
IRR
33% registered · 15 of 45 announcements 4 other origin
Route objects
28 naming AS17025

Reputation

Classification and threat

Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.

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: 442 networks and 1,781 prefixes, as published 2026-10-16. 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

Cross-check