Autonomous system
AS33661 CMCS
Unclassified ARIN Cable/DSL/ISP
Summary
Comcast
cable residential isp us
CMCS is the AS handle for Comcast Cable Communications, LLC, a major US cable operator.
What it's used for
- The space carries residential cable internet access, evidenced by reverse DNS entries like
c-76-148-64-0.hsd1.fl.comcast.netand netnames such asNAPLES-CPE-18andWESTFLORIDA-15. - With 630,528 IPv4 addresses announced across 165 prefixes and only 23 observed neighbours, the high address-to-neighbour ratio indicates a large access/eyeball network rather than a transit provider.
Notable
- Registrants consistently identify as Comcast Cable Communications, LLC or its historical variants (Inc., IP Services), aligning with the announcer.
- The address inventory is finely subdivided into regional blocks (e.g., Naples, West Florida, Lake County), reflecting site-by-site segmentation of a corporate estate.
- The AS was first seen in RIS in 2007, consistent with Comcast's expansion of its IP services infrastructure.
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
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Transit providers
1 upstream, 20 downstream and 24 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS7922 | Comcast Cable Communications, LLC | 803 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-13, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 164 prefixes · 630K addresses IPv6 43 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 207 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS33661- 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
- Name
- Comcast - West Florida
- 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
- RPKI
- 100% valid · 21 valid, 0 with no ROA
- ROAs
- 268 authorising AS33661
- ASPA
- no ASPA record
- IRR
- 76% registered · 16 of 21 announcements
- Route objects
- 56 naming AS33661
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: 440 networks and 1,773 prefixes, as published 2026-10-13. 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