Skip to content
thenetworkery

AS numbers

AS33657 Comcast - Baltimore and D.C.

AS33657 is operated by Comcast - Baltimore and D.C. and registered with ARIN (US) since 2005-02-16.

It announces 27 IPv4 and 238 IPv6 prefixes, 98% of them RPKI valid.

RIPE RIS sees 2 upstream and peer networks and 133 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
NameComcast - Baltimore and D.C.
Registry handleCMCS
Registry (RIR)ARIN
CountryUnited States (US)
Delegated on2005-02-16
Network typeCable/DSL/ISP, Regional
Peering policyRestrictive
Prefixes (IPv4 / IPv6)27 / 238
RPKI valid98% (260 / 265)
Upstreams and peers2
Downstream networks133

Routing health

  • AS33657 announces 27 IPv4 and 238 IPv6 prefixes.
  • 260 of 265 announced prefixes are RPKI valid.
  • 5 announced prefixes are not covered by a ROA of AS33657 (they may have none, or another network’s).
  • 2 upstreams and peers, 133 downstream networks seen.

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 265

  • 50.201.252.0/24
  • 50.202.117.0/24
  • 50.202.155.0/24
  • 50.203.251.0/24
  • 50.204.116.0/24
  • 50.204.128.0/24
  • 50.205.74.0/24
  • 50.207.162.0/24
  • 50.216.214.0/24
  • 50.219.87.0/24
  • 50.223.158.0/24
  • 50.223.159.0/24
  • 50.224.212.0/24
  • 50.232.109.0/24
  • 50.232.173.0/24
  • 50.232.184.0/24
  • 50.235.98.0/24
  • 50.235.236.0/24
  • 50.236.38.0/24
  • 50.236.234.0/24
  • 50.238.163.0/24
  • 69.67.80.0/20
  • 76.78.2.0/24
  • 107.1.101.0/24
  • 192.110.220.0/23
  • 192.189.235.0/24
  • 208.87.105.0/24
  • 2001:559:1da::/48
  • 2001:559:1f8::/48
  • 2001:559:2b6::/48
  • 2001:559:2ca::/48
  • 2001:559:2cb::/48
  • 2001:559:2f3::/48
  • 2001:559:3ba::/48
  • 2001:559:3ca::/48
  • 2001:559:3d2::/48
  • 2001:559:3dc::/48
  • 2001:559:3eb::/48
  • 2001:559:3f1::/48
  • 2001:559:4a0::/48
  • 2001:559:4a5::/48
  • 2001:559:4a8::/48
  • 2001:559:5b7::/48
  • 2001:559:5cb::/48
  • 2001:559:5cd::/48
  • 2001:559:5d3::/48
  • 2001:559:5ef::/48
  • 2001:559:7a1::/48
  • 2001:559:7a::/48
  • 2001:559:7be::/48
  • 2001:559:7d0::/48
  • 2001:559:7e2::/48
  • 2001:559:7e5::/48
  • 2001:559:7e6::/48
  • 2001:559:7e9::/48
  • 2001:559:7fe::/48
  • 2001:559:16a::/48
  • 2001:559:25a::/48
  • 2001:559:25b::/48
  • 2001:559:30d::/48
  • 2001:559:42c::/48
  • 2001:559:43a::/48
  • 2001:559:45a::/48
  • 2001:559:48::/48
  • 2001:559:70d::/48
  • 2001:559:74b::/48
  • 2001:559:75e::/48
  • 2001:559:80b0::/48
  • 2001:559:80b1::/48
  • 2001:559:80b5::/48
  • 2001:559:80c2::/48
  • 2001:559:80cb::/48
  • 2001:559:80d3::/48
  • 2001:559:80e9::/48
  • 2001:559:80f5::/48
  • 2001:559:80fc::/48
  • 2001:559:80fd::/48
  • 2001:559:81b5::/48
  • 2001:559:81ca::/48
  • 2001:559:81f0::/48
  • 2001:559:81ff::/48
  • 2001:559:82c9::/48
  • 2001:559:82d8::/48
  • 2001:559:83b9::/48
  • 2001:559:83eb::/48
  • 2001:559:84bc::/48
  • 2001:559:84be::/48
  • 2001:559:84cc::/48
  • 2001:559:84de::/48
  • 2001:559:84e1::/48
  • 2001:559:85a7::/48
  • 2001:559:85ab::/48
  • 2001:559:85bc::/48
  • 2001:559:85cd::/48
  • 2001:559:85e4::/48
  • 2001:559:85ec::/48
  • 2001:559:85f0::/48
  • 2001:559:86ba::/48
  • 2001:559:87::/48
  • 2001:559:87b4::/48

Showing the first 100.

Upstreams and peers 2

The networks RIPE RIS sees next to AS33657 in BGP paths, the most visible first.

Peering

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

Facilities 1
FacilityCityCountry
Digital Realty IAD (43940 Digital Loudoun)AshburnUS

More about AS33657

Sources: RIR delegation data and PeeringDB (updated daily); routing from RIPEstat (RIPE NCC RIS and RPKI), refreshed daily. Routing data from 2026-11-14 23:18 UTC. The country is where the AS number was registered, not necessarily where the network operates.