asn.dev

Autonomous system

AS33656 CMCS

Unclassified ARIN Cable/DSL/ISP

IPv4 addresses 166K 48 prefixes
IPv6 prefixes 13 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 1 1 downstream
Flagged prefixes 0 none

Summary

Comcast

United States of America · AI-generated

residential cable isp us

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

What it's used for

  • The address space carries residential broadband access, evidenced by reverse DNS entries such as c-71-238-223-254.hsd1.ar.comcast.net and c-67-162-200-0.hsd1.ar.comcast.net.
  • With 165,632 IPv4 addresses announced across 48 prefixes and only 2 observed neighbours, the high address-to-neighbour ratio indicates a large-scale access network rather than a transit provider.

Notable

  • Registrants for the largest prefixes include both "Comcast Cable Communications, Inc." and "Comcast Cable Communications, LLC", reflecting the corporate entity name change over time.
  • Netnames such as LITTLE-ROCK-10 and LITTLEROCK-CBC-28 identify this specific AS as serving the Little Rock, Arkansas region within Comcast's broader infrastructure.
  • The inventory includes 13 IPv6 prefixes, including a /26 block, supporting dual-stack residential connectivity.

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, 1 downstream and 3 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 2026-10-20, 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 48 prefixes · 166K addresses IPv6 13 prefixes

CountryNamePrefixes
USUnited States of America61

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS33656
Registry name
CMCS
Registrant
Comcast Cable Communications, LLC
Abuse contact
abuse@comcast.net
Registered
2005-02-16
Last changed
2021-01-25
Allocation
assigned

Declared

PeeringDB profile

self-reported
Name
Comcast - Little Rock
Network type
Cable/DSL/ISP
Scope
Regional
Traffic ratio
Not Disclosed
Peering policy
Restrictive

PeeringDB records are maintained by the network operator and are not independently verified. Treat them as a statement of intent rather than of fact. For the observed and recorded view, see peering, which lists the exchanges Packet Clearing House has a port on file for.

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 7 valid, 0 with no ROA
ROAs
71 authorising AS33656
ASPA
no ASPA record
IRR
0% registered · 0 of 7 announcements
Route objects
10 naming AS33656

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 1,778 prefixes, as published 2026-10-20. 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