Autonomous System

AS21508 Comcast Cable Communications, LLC

ISPActiveUnited StatesARIN

AS21508 (COMCAST-21508) is an ISP network operated by Comcast Cable Communications, LLC in United States, registered with ARIN. It has 16 IPv4 prefixes with 70,144 addresses and 61 IPv6 prefixes, which makes it the 3,001st largest of 82,200 active autonomous systems by IPv4 space.

IPv4 addresses70,144in 16 prefixes
IPv6 prefixes61≈ 7.4 × 10²⁵ addresses
Size rank#3,001of 82,200 active ASNs
Abuser scoreVery Lowunder 0.01% of its addresses flagged · method

Details

OrganizationComcast Cable Communications, LLC
AS nameCOMCAST-21508
Websitecomcast.com
Country United States (US)
Network typeISP
RegistryARIN
Abuse contactabuse@comcast.net
Registered2001-05-16
Last updated2021-01-25

IPv4 prefixes

16 prefixes · 70,144 addresses
NetworkAddressesFirst – last address
141.104.0.0/1665,536141.104.0.0 – 141.104.255.255
198.90.112.0/221,024198.90.112.0 – 198.90.115.255
50.204.101.0/2425650.204.101.0 – 50.204.101.255
50.205.217.0/2425650.205.217.0 – 50.205.217.255
50.216.229.0/2425650.216.229.0 – 50.216.229.255
50.217.1.0/2425650.217.1.0 – 50.217.1.255
50.217.207.0/2425650.217.207.0 – 50.217.207.255
50.218.47.0/2425650.218.47.0 – 50.218.47.255
50.228.113.0/2425650.228.113.0 – 50.228.113.255
50.229.113.0/2425650.229.113.0 – 50.229.113.255
50.229.114.0/2425650.229.114.0 – 50.229.114.255
50.235.34.0/2425650.235.34.0 – 50.235.34.255
157.240.148.0/24256157.240.148.0 – 157.240.148.255
173.242.174.0/24256173.242.174.0 – 173.242.174.255
204.194.47.0/24256204.194.47.0 – 204.194.47.255
205.223.19.0/24256205.223.19.0 – 205.223.19.255

IPv6 prefixes

61 prefixes
  • 2001:559:8a::/48
  • 2001:559:c0::/48
  • 2001:559:f7::/48
  • 2001:559:220::/48
  • 2001:559:243::/48
  • 2001:559:280::/48
  • 2001:559:37d::/48
  • 2001:559:3ac::/48
  • 2001:559:3b9::/48
  • 2001:559:3c8::/48
  • 2001:559:40a::/48
  • 2001:559:49a::/48
  • 2001:559:49b::/48
  • 2001:559:53c::/48
  • 2001:559:5c9::/48
  • 2001:559:5db::/48
  • 2001:559:72b::/48
  • 2001:559:73c::/48
  • 2001:559:788::/48
  • 2001:559:78a::/48
  • 2001:559:79d::/48
  • 2001:559:79e::/48
  • 2001:559:7a7::/48
  • 2001:559:7db::/48
  • 2001:559:804c::/48
The 25 largest of 61. The API and the database have all of them.

Query AS21508 with the API

The ASN lookup returns everything on this page as JSON, including every prefix. ASN lookups need an API key: a free account comes with 1,000 requests a day. 

curl "https://api.ipapi.is/?q=AS21508&key=YOUR_API_KEY"

Any address in its prefixes resolves to AS21508, with or without a key:

curl "https://api.ipapi.is/?q=141.104.0.1"

Other networks of Comcast Cable Communications, LLC

6 of 11
AS7922 Comcast Cable Communications, LLC68,336,896 IPv4 addressesAS20214 Comcast Cable Communications, LLC140,544 IPv4 addressesAS33651 Comcast Cable Communications, LLC83,456 IPv4 addressesAS33491 Comcast Cable Communications, LLC48,128 IPv4 addressesAS7015 Comcast Cable Communications, LLC47,104 IPv4 addressesAS33659 Comcast Cable Communications, LLC31,488 IPv4 addresses

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