Autonomous system profile

Review registration details, announced prefixes, network relationships and historical snapshots.

AS21508

Announcement observedARIN

Comcast Cable Communications, LLC · COMCAST-21508

This profile is assembled from CHA.LA's normalized registration, routing and observation snapshots.

Last active10/22/2026, 06:18:33Snapshot expired

View network topology RDAP registration

ASN: AS21508
Registration country: United States
Name: Comcast Cable Communications, LLC
Abbreviation: COMCAST-21508
Registration date: 5/16/2001, 04:00:00
Status: Announcement observed
RIR: ARIN

Network relationships and announced prefixes

ASN / prefix	Description / organization	Geographic scope	First seen	Last active	IPv4	IPv6	Status
141.104.0.0/16BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/17/2026, 00:00:00	10/15/2026, 16:00:00	✓	×	Currently valid
157.240.147.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	10/1/2026, 00:00:00	10/15/2026, 16:00:00	✓	×	Currently valid
157.240.148.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/17/2026, 00:00:00	10/15/2026, 16:00:00	✓	×	Currently valid
173.242.174.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/17/2026, 00:00:00	10/15/2026, 16:00:00	✓	×	Currently valid
198.90.112.0/22BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/17/2026, 00:00:00	10/15/2026, 16:00:00	✓	×	Currently valid
204.194.47.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/17/2026, 00:00:00	10/15/2026, 16:00:00	✓	×	Currently valid
205.223.19.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/17/2026, 00:00:00	10/15/2026, 16:00:00	✓	×	Currently valid
50.204.101.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/17/2026, 00:00:00	10/15/2026, 16:00:00	✓	×	Currently valid
50.205.217.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/17/2026, 00:00:00	10/15/2026, 16:00:00	✓	×	Currently valid
50.216.229.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/17/2026, 00:00:00	10/15/2026, 16:00:00	✓	×	Currently valid
50.217.1.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/17/2026, 00:00:00	10/15/2026, 16:00:00	✓	×	Currently valid
50.217.207.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/17/2026, 00:00:00	10/15/2026, 16:00:00	✓	×	Currently valid
50.218.47.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/17/2026, 00:00:00	10/15/2026, 16:00:00	✓	×	Currently valid
50.228.113.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/17/2026, 00:00:00	10/15/2026, 16:00:00	✓	×	Currently valid
50.229.113.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/17/2026, 00:00:00	10/15/2026, 16:00:00	✓	×	Currently valid
50.229.114.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/17/2026, 00:00:00	10/15/2026, 16:00:00	✓	×	Currently valid
50.235.34.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/17/2026, 00:00:00	10/15/2026, 16:00:00	✓	×	Currently valid

BGP prefixes have no geographic country; the column is marked not applicable.

Registration and sources

Organization: Comcast Cable Communications, LLC
RIR: ARIN
Registration country: United States
Registration date: 5/16/2001, 04:00:00
Abuse contact: abuse@comcast.net

Snapshot trend

10/22/2026, 06:18:3317 v461 v61 Upstream · 0 Uncertain

10/10/2026, 03:10:1717 v461 v61 Upstream · 0 Uncertain

10/1/2026, 07:28:1317 v461 v61 Upstream · 0 Uncertain

ASN route snapshotThis page reads collected ASN, prefix, relationship and history data. External interfaces are used for initial collection and scheduled refreshes.Source keys: iana-rdap-asn-bootstrap · rir-rdap-asn