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Network

AS21508

United States

Comcast Cable Communications, LLC

Comcast Cable Communications announces 142 IPv4 prefixes (689.2K addresses) and 73 IPv6 prefixes from the United States. 97% of them are covered by valid RPKI records.

Prefixes

142 · 73

IPv4 · IPv6

Address space

689.2K

IPv4 addresses · 8.5M IPv6 /48s

RPKI

97% valid

0 invalid · 6 without a record

Peering

Restrictive

0 exchanges · 1 facility

Where it is

1 facility with known locations

Details

Network

Name
Comcast Cable Communications, LLC
Type
Cable/DSL/ISP
Country
United StatesUnited States
Registry
ARIN
Registered
May 16, 200125 years ago
UsersCloudflare Radar's estimate of people who reach the internet through this network.
About 511
Abuse contact
abuse@comcast.net

Connectivity

Cloudflare Radar
UpstreamsNetworks this one buys transit from.
Comcast
PeersNetworks it exchanges traffic with directly, without paying either way.
0
CustomersNetworks that buy transit from it.
50

Routing security

ASPAAn RPKI record listing the only networks allowed to be its upstream providers, so routers can reject leaked or forged paths.
Not published
RPKI coverageShare of its announcements that a signed record (ROA) authorizes.
209 of 215 valid
IncidentsPossible BGP hijacks (high-confidence detections) and route leaks involving this network in the last 30 days, from Cloudflare Radar.
None in 30 days

AS21508 on Cloudflare Radar →PeeringDB →

Largest prefixes

215 announcements in all

IPv4

142
  1. 71.62.0.0/16RPKI valid
  2. 141.104.0.0/16No ROA
  3. 174.179.0.0/16RPKI valid
  4. 71.63.0.0/17RPKI valid
  5. 76.104.0.0/17RPKI valid
  6. 50.189.192.0/18RPKI valid
  7. 71.206.128.0/18RPKI valid
  8. 75.75.0.0/18RPKI valid
  9. 76.120.192.0/18RPKI valid
  10. 76.123.0.0/18RPKI valid
  11. 184.115.0.0/18RPKI valid
  12. 23.25.96.0/19RPKI valid
  13. 50.184.128.0/19RPKI valid
  14. 50.186.32.0/19RPKI valid
  15. 50.211.32.0/19RPKI valid
  16. 50.215.32.0/19RPKI valid
  17. 50.242.32.0/19RPKI valid
  18. 50.245.224.0/19RPKI valid
  19. 67.163.96.0/19RPKI valid
  20. 67.166.160.0/19RPKI valid
  21. 67.172.192.0/19RPKI valid
  22. 67.187.0.0/19RPKI valid
  23. 71.24.32.0/19RPKI valid
  24. 71.56.160.0/19RPKI valid