asn.dev

Autonomous system

AS33654 CMCS

Unclassified ARIN

IPv4 addresses 338K 64 prefixes
IPv6 prefixes 22 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 1 14 downstream
Flagged prefixes 0 none

Summary

Comcast Cable Communications

United States of America · AI-generated

residential cable isp us

The AS handle CMCS is held by Comcast Cable Communications, LLC.

What it's used for

  • The space carries residential cable internet and VoIP services, evidenced by reverse DNS entries like c-98-60-127-255.hsd1.nm.comcast.net and netnames such as COMCAST-VOIP-4.
  • With 337,920 IPv4 addresses announced across 64 prefixes and only 14 observed neighbours, the high address-to-neighbour ratio indicates a large access/eyeball network rather than a transit provider.

Notable

  • Registrants are consistent with the announcer, appearing as either Comcast Cable Communications, LLC or Comcast Cable Communications, Inc.
  • The address inventory is heavily concentrated in the Albuquerque region, as indicated by netnames like ALBUQUERQUE-24, ALBUQUERQUE-14, and ALBUQUERQUE-17.
  • The inventory includes a mix of /16, /17, and /18 blocks, with the largest being 98.60.0.0/16.

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

1 upstream, 14 downstream and 19 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS7922Comcast Cable Communications, LLC512

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-16, 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 64 prefixes · 338K addresses IPv6 22 prefixes

CountryNamePrefixes
USUnited States of America86

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS33654
Registry name
CMCS
Registrant
Comcast Cable Communications, LLC
Abuse contact
abuse@comcast.net
Registered
2005-02-16
Last changed
2021-01-25
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 16 valid, 0 with no ROA
ROAs
109 authorising AS33654
ASPA
no ASPA record
IRR
100% registered · 16 of 16 announcements
Route objects
108 naming AS33654

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 1,783 prefixes, as published 2026-10-17. 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