asn.dev

Autonomous system

AS33655 CMCS

Unclassified ARIN

IPv4 addresses 89.60K 40 prefixes
IPv6 prefixes 13 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 1 3 downstream
Flagged prefixes 0 none

Summary

Comcast

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 address space carries residential cable internet services, evidenced by reverse DNS entries such as c-69-242-144-0.hsd1.mo.comcast.net and c-69-254-247-254.hsd1.ks.comcast.net.
  • With 89,600 IPv4 addresses announced across 40 prefixes and only 4 observed neighbours, the high address-to-neighbour ratio indicates a large-scale access or eyeball network rather than a transit provider.

Notable

  • Registrants consistently identify as Comcast Cable Communications, LLC or its predecessors, including "Comcast Cable Communications, Inc" and "Comcast Cable Communications, IP Services," aligning with the current holder.
  • The address inventory is finely subdivided into regional blocks with netnames like INDEPENDENCE-5, OLATHE-6, and CONNECTICUT-17, reflecting site-by-site segmentation within the corporate estate.

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, 3 downstream and 5 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS7922Comcast Cable Communications, LLC224

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-14, 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 40 prefixes · 89.60K addresses IPv6 13 prefixes

CountryNamePrefixes
USUnited States of America53

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS33655
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 · 7 valid, 0 with no ROA
ROAs
63 authorising AS33655
ASPA
no ASPA record
IRR
0% registered · 0 of 7 announcements
Route objects
3 naming AS33655

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 1,771 prefixes, as published 2026-10-15. 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