Autonomous system
AS33491 COMCAST-33491
Unclassified ARIN Cable/DSL/ISP
Summary
Comcast
cable residential isp xfinity
The AS handle COMCAST-33491 is held by Comcast Cable Communications, LLC.
What it's used for
- The address space carries residential customer premises equipment, evidenced by netnames like
CHICAGO-CPE-1andINDIANA-CPE-11, and reverse DNS records such asc-24-13-0-0.hsd1.il.comcast.net. - With 3,142,400 IPv4 addresses announced across 325 prefixes and 257 observed neighbours, the high address-to-neighbour ratio indicates a large-scale access network rather than a transit provider.
Notable
- Registrants consistently identify as Comcast Cable Communications, LLC or its historical variants, aligning with the announcer.
- The address inventory is finely subdivided into hundreds of /16 and /17 blocks, reflecting site-by-site segmentation for a major US cable operator.
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 2026-10-13, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 324 prefixes · 3.14M addresses IPv6 200 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 524 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS33491- Registry name
- COMCAST-33491
- Registrant
- Comcast Cable Communications, LLC
- Abuse contact
- abuse@comcast.net
- Registered
- 2004-12-30
- Last changed
- 2021-01-25
- Allocation
- assigned
Declared
PeeringDB profile
- Name
- Comcast - Chicago
- Also known as
- Comcast - Chicago
- 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
- 93% valid · 267 valid, 20 with no ROA
- ROAs
- 7,817 authorising AS33491
- ASPA
- no ASPA record
- IRR
- 70% registered · 201 of 287 announcements 12 other origin
- Route objects
- 400 naming AS33491
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: 436 networks and 1,771 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