Autonomous system
AS33666 CMCS - Comcast Cable Communications, LLC
Unclassified ARIN Cable/DSL/ISP
Summary
Comcast Cable Communications
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 access, evidenced by reverse DNS entries such as
c-67-177-80-0.hsd1.fl.comcast.netandc-68-35-208-0.hsd1.al.comcast.net. - With 247,296 IPv4 addresses announced across 89 prefixes and only 6 observed neighbours, the high address-to-neighbour ratio indicates this is an access network serving end-users rather than a transit provider.
Notable
- Registrants are consistent with the announcer, appearing as both Comcast Cable Communications, LLC and Comcast Cable Communications, Inc. across the largest prefixes.
- The inventory is finely subdivided into regional blocks, with netnames like
TALLAHASSEE-1,JUMPSTART-1, andNORTH-GULF-21reflecting site-by-site segmentation of the corporate estate. - The AS was first seen in RIS in 2007, indicating it has been active for nearly two decades.
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, 5 downstream and 8 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS7922 | Comcast Cable Communications, LLC | 273 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-03, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 89 prefixes · 247K addresses IPv6 12 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 101 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS33666- 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 - Tallahassee (North Gulf)
- Also known as
- Comcast - Tallahassee (North Gulf)
- Network type
- Cable/DSL/ISP
- Scope
- Regional
- Traffic ratio
- Not Disclosed
- Peering policy
- Restrictive
- Facilities
- 1 facilities
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
- 50% valid · 3 valid, 3 with no ROA
- ROAs
- 110 authorising AS33666
- ASPA
- no ASPA record
- IRR
- 50% registered · 3 of 6 announcements 2 other origin
- Route objects
- 109 naming AS33666
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: 451 networks and 1,853 prefixes, as published 2026-11-04. 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