AS21508 Comcast Cable Communications, LLC
AS21508 (COMCAST-21508) is registered to Comcast Cable Communications, LLC in US. It originates 78 prefixes in the global routing table.
Who holds AS21508
Names from RIPE NCC’s daily list of every allocated AS number. The ASN lookup fetches the full WHOIS record live.
What AS21508 announces
Prefixes originated by AS21508 in the RouteViews table (refreshed every four hours), each checked against the RPKI (every ten minutes) and the IRR (daily).
Announced prefixes
Each opens its own page: who announces it, the paths our collectors see, its ROAs and route objects.
RPKI valid RPKI invalid no ROA covers it
Who AS21508 is reached through
The AS just before AS21508 in the paths our looking glass collectors hold, for 60 of its prefixes. Usually a transit provider, sometimes a peer. The number is how many of those prefixes it was seen on.
Routing registry objects
From the mirrored IRR databases (RADB, the five RIRs and more). Look it up live.
| Source | as-name | Maintained by |
|---|---|---|
| LEVEL3 | N | MNT-CMCS |
Route objects with origin AS21508: RADB 24 · LEVEL3 12 · ARIN 3