asn.dev

Autonomous system

AS33287 COMCAST-33287

Unclassified ARIN

IPv4 addresses 1.31M 158 prefixes
IPv6 prefixes 291 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 2 131 downstream
Flagged prefixes 0 none

Summary

Comcast

United States of America · AI-generated

residential cable isp us

COMCAST-33287 is operated by Comcast Cable Communications, LLC.

What it's used for

  • The address space carries residential and small business cable internet access, evidenced by reverse DNS entries like c-68-80-128-0.hsd1.pa.comcast.net and netnames such as PA-METRO-7, PA-CPE-33, and PHILADELPHIA-SMB-1.
  • The AS announces 1,312,512 IPv4 addresses across 158 prefixes and 294 IPv6 prefixes, while maintaining 132 observed neighbours. This high address-to-neighbour ratio indicates a large-scale access network rather than a transit provider.

Notable

  • Registrants for the largest prefixes are consistently Comcast Cable Communications, Inc. or Comcast Cable Communications, LLC, aligning with the AS holder.
  • The inventory is dominated by large /15 and /16 blocks in the 68.0.0.0/8, 71.0.0.0/8, and 76.0.0.0/8 ranges, reflecting a substantial legacy cable footprint.
  • The address inventory is finely subdivided into regional and service-specific blocks, such as PA-WEST-6 and PHILADELPHIA-CBC-33, supporting site-by-site segmentation for a major 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

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

2 upstream, 131 downstream and 143 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS7922Comcast Cable Communications, LLC11,530
AS3356Level 3 Parent, LLC180

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

Shape and geography

IPv4 158 prefixes · 1.31M addresses IPv6 291 prefixes

CountryNamePrefixes
USUnited States of America449

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS33287
Registry name
COMCAST-33287
Registrant
Comcast Cable Communications, LLC
Abuse contact
abuse@comcast.net
Registered
2004-11-16
Last changed
2021-01-25
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
96% valid · 339 valid, 12 with no ROA 1 RPKI-invalid
ROAs
2,953 authorising AS33287
ASPA
no ASPA record
IRR
0.6% registered · 2 of 352 announcements 10 other origin
Route objects
21 naming AS33287

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 1,773 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

Cross-check