Autonomous system
AS33668 CMCS
Residential ARIN
Summary
Comcast (regional)
isp residential eyeball cable
Comcast Cable Communications (CC04) — one of Comcast's regional ASNs, part of the Xfinity residential network.
What it's used for
- Cable and fibre home internet for US households.
Notable
- An "eyeball" network: addresses here are home connections, commonly behind carrier-grade NAT, not servers.
- Comcast operates several regional ASNs that all roll up to the Xfinity network; the primary one is AS7922.
Interesting
- Regional Comcast ASNs like this reflect the company's growth by acquiring and integrating local cable systems across the country.
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.
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
IPv4 191 prefixes · 1.86M addresses IPv6 75 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 266 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS33668- 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
- RPKI
- 92% valid · 87 valid, 8 with no ROA
- ROAs
- 3,355 authorising AS33668
- ASPA
- no ASPA record
- IRR
- 24% registered · 23 of 95 announcements 2 other origin
- Route objects
- 61 naming AS33668
Reputation
Classification and threat
Residential Fixed-line consumer ISP. Addresses here are homes.
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 1,772 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