Network
AS21508 Comcast Cable Communications, LLC
- Autonomous system number
- AS21508
- Registered in
- US
- Registry
- ARIN
- ASN registered
- 2001-05-16
- IPv4 prefixes announced
- 17
- IPv6 prefixes announced
- 61
- Internet exchanges
- 0
- Data centres
- 1
- Internet users (estimate)
- ~511
Prefix counts from the global routing table as of 2026-10-04. Not counted: 138 more prefixes this network originates that few routers see, inside address space AS7922 announces widely. Exchange and data-centre counts are what the network lists in PeeringDB. User estimate by APNIC Labs, 2026-09-30. This network participates in MANRS.
Upstreams and peers, traceroute paths through it, where it hands off to its transit providers, routing history and alerts - free with an account, and queryable from Claude, ChatGPT and other AI agents through the BGPScout MCP server.
Open the full network page