AS21508 Comcast - Richmond

AS21508 is operated by Comcast - Richmond and registered with ARIN (US) since 2001-05-16.

It announces 17 IPv4 and 61 IPv6 prefixes, 91% of them RPKI valid.

RIPE RIS sees 1 upstream and peer networks and 50 downstream networks next to it.

PeeringDB lists it as a Cable/DSL/ISP network at 1 facility. Its peering policy is restrictive.

Run the full network report BGP lookup WHOIS PeeringDB lookup

Name	Comcast - Richmond
Registry handle	COMCAST-21508
Registry (RIR)	ARIN
Country	United States (US)
Delegated on	2001-05-16
Network type	Cable/DSL/ISP, Regional
Peering policy	Restrictive
Prefixes (IPv4 / IPv6)	17 / 61
RPKI valid	91% (71 / 78)
Upstreams and peers	1
Downstream networks	50

Routing health

AS21508 announces 17 IPv4 and 61 IPv6 prefixes.
71 of 78 announced prefixes are RPKI valid.
7 announced prefixes are not covered by a ROA of AS21508 (they may have none, or another network’s).
One upstream or peer seen (AS7922): an outage there takes the whole network off the internet.

For every check with the fix (IRR route objects, the RPKI state of each route, reverse DNS and the registration), run the full network report.

Announced prefixes 78

50.204.101.0/24
50.205.217.0/24
50.216.229.0/24
50.217.1.0/24
50.217.207.0/24
50.218.47.0/24
50.228.113.0/24
50.229.113.0/24
50.229.114.0/24
50.235.34.0/24
141.104.0.0/16
157.240.147.0/24
157.240.148.0/24
173.242.174.0/24
198.90.112.0/22
204.194.47.0/24
205.223.19.0/24
2001:559:3ac::/48
2001:559:3b9::/48
2001:559:3c8::/48
2001:559:5c9::/48
2001:559:5db::/48
2001:559:7a7::/48
2001:559:7db::/48
2001:559:8a::/48
2001:559:37d::/48
2001:559:40a::/48
2001:559:49a::/48
2001:559:49b::/48
2001:559:53c::/48
2001:559:72b::/48
2001:559:73c::/48
2001:559:78a::/48
2001:559:79d::/48
2001:559:79e::/48
2001:559:81bf::/48
2001:559:81d7::/48
2001:559:81d8::/48
2001:559:82fd::/48
2001:559:85c1::/48
2001:559:85ff::/48
2001:559:87b2::/48
2001:559:220::/48
2001:559:243::/48
2001:559:280::/48
2001:559:788::/48
2001:559:804c::/48
2001:559:833e::/48
2001:559:841c::/48
2001:559:871a::/48
2001:559:875f::/48
2001:559:8201::/48
2001:559:8416::/48
2001:559:8445::/48
2001:559:8535::/48
2001:559:8604::/48
2001:559:8773::/48
2001:559:c0::/48
2001:559:c0f6::/48
2001:559:c0f7::/48
2001:559:c071::/48
2001:559:c1a5::/48
2001:559:c1ca::/48
2001:559:c2a7::/48
2001:559:c3e9::/48
2001:559:c4db::/48
2001:559:c4f6::/48
2001:559:c10a::/48
2001:559:c28f::/48
2001:559:c45f::/48
2001:559:c174::/48
2001:559:c290::/48
2001:559:c344::/48
2001:559:c458::/48
2001:559:c460::/48
2001:559:c515::/48
2001:559:c538::/48
2001:559:f7::/48

Upstreams and peers 1

The networks RIPE RIS sees next to AS21508 in BGP paths, the most visible first.

AS7922 Comcast

Peering

Peering policy: Restrictive. Suggested max-prefix limits: 0 IPv4, 0 IPv6. PeeringDB record

Facilities 1

Facility	City	Country
EdgeConneX Richmond (EDCRIC01)	Richmond	US

More about AS21508

← AS21507 AS21509 →

Sources: RIR delegation data and PeeringDB (updated daily); routing from RIPEstat (RIPE NCC RIS and RPKI), refreshed daily. Routing data from 2026-11-14 12:55 UTC. The country is where the AS number was registered, not necessarily where the network operates.