asn.dev

Autonomous system

AS33490 COMCAST-33490

Unclassified ARIN

IPv4 addresses 853K 130 prefixes
IPv6 prefixes 61 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 2 63 downstream
Flagged prefixes 0 none

Summary

Comcast

United States of America · AI-generated

residential cable isp xfinity

COMCAST-33490 is operated by Comcast Cable Communications, LLC.

What it's used for

  • The address space carries residential cable internet traffic, evidenced by reverse DNS entries such as c-76-115-64-0.hsd1.or.comcast.net and netnames like OREGON-23 and BEAVERTON-CPE-11.
  • With 851712 IPv4 addresses announced across 126 prefixes and 67 observed neighbours, the high address-to-neighbour ratio indicates a large-scale access network rather than a transit provider.

Notable

  • Registrants vary slightly across prefixes, including Comcast Cable Communications, Inc., Comcast Cable Communications, LLC, Comcast Cable Communications, IP Services, and Comcast Cable Communications Holdings, Inc, reflecting internal corporate restructuring and historical acquisitions.
  • The inventory consists of numerous /16, /17, and /18 blocks concentrated in the Pacific Northwest, specifically Oregon and Washington, consistent with Comcast's regional cable infrastructure footprint.

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, 63 downstream and 76 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS7922Comcast Cable Communications, LLC3,031
AS3356Level 3 Parent, LLC202

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-15, 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 130 prefixes · 853K addresses IPv6 61 prefixes

CountryNamePrefixes
USUnited States of America191

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS33490
Registry name
COMCAST-33490
Registrant
Comcast Cable Communications, LLC
Abuse contact
abuse@comcast.net
Registered
2004-12-30
Last changed
2021-01-25
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
70% valid · 68 valid, 14 with no ROA 15 RPKI-invalid
ROAs
2,306 authorising AS33490
ASPA
no ASPA record
IRR
61% registered · 59 of 97 announcements 20 other origin
Route objects
128 naming AS33490

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 1,782 prefixes, as published 2026-10-16. 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