Autonomous System details
AS21508
Comcast Cable Communications, LLC — comcast.net
Keep users in the loop.
Ship release notes that get read
Try Noticeable
Interested in advertising here?
Contact us
Summary
| Country |
 United States
|
| Organization | Comcast Cable Communications, LLC |
| Domain | comcast.net |
| Number of IPv4 | 71,424 |
| Number of IPv6 | 7.7371× 1025 |
| AS Type | ISP |
| Registry | ARIN |
| Allocated | May 16, 2001 (about 25 years ago) |
| Updated | January 25, 2021 (about 5 years ago) |
IP Ranges
AS21508 announces 18 IPv4 ranges and 64 IPv6 ranges.
That's a total of 71,424 IPv4 addresses and 7.7371× 1025 IPv6 addresses.
| Prefix | Organization | Size | Registry | Status |
|---|---|---|---|---|
| 50.204.101.0/24 |
Comcast Cable Communications, LLC
|
256 | ARIN | ALLOCATION |
| 50.205.217.0/24 |
Comcast Cable Communications, LLC
|
256 | ARIN | ALLOCATION |
| 50.216.229.0/24 |
Comcast Cable Communications, LLC
|
256 | ARIN | ALLOCATION |
| 50.217.1.0/24 |
Comcast Cable Communications, LLC
|
256 | ARIN | ALLOCATION |
| 50.217.207.0/24 |
Comcast Cable Communications, LLC
|
256 | ARIN | ALLOCATION |
| 50.218.47.0/24 |
Comcast Cable Communications, LLC
|
256 | ARIN | ALLOCATION |
| 50.219.12.0/22 |
Comcast Cable Communications, LLC
|
1,024 | ARIN | ALLOCATION |
| 50.228.113.0/24 |
Comcast Cable Communications, LLC
|
256 | ARIN | ALLOCATION |
| 50.229.113.0/24 |
Comcast Cable Communications, LLC
|
256 | ARIN | ALLOCATION |
| 50.229.114.0/24 |
Comcast Cable Communications, LLC
|
256 | ARIN | ALLOCATION |
| 50.235.34.0/24 |
Comcast Cable Communications, LLC
|
256 | ARIN | ALLOCATION |
| 141.104.0.0/16 |
Virginia Department of Education
|
65,536 | ARIN | ALLOCATION |
| 157.240.147.0/24 |
Facebook, Inc.
|
256 | ARIN | ALLOCATION |
| 157.240.148.0/24 |
Facebook, Inc.
|
256 | ARIN | ALLOCATION |
| 173.242.174.0/24 |
County of Henrico
|
256 | ARIN | ALLOCATION |
| 198.90.112.0/22 |
Whitesky Communications, Llc.
|
1,024 | ARIN | ALLOCATION |
| 204.194.47.0/24 |
Va. Dept. of Rehabilitative Services
|
256 | ARIN | ALLOCATION |
| 205.223.19.0/24 |
Virginia State Lottery Department
|
256 | ARIN | ALLOCATION |
| Prefix | Organization | Size | Registry | Status |
|---|---|---|---|---|
| 2001:559:8a::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:c0::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:f7::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:220::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:243::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:280::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:37d::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:3ac::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:3b9::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:3c8::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:40a::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:49a::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:49b::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:53c::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:5c9::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:5db::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:72b::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:73c::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:788::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:78a::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:79d::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:79e::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:7a7::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:7db::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:804c::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:81bf::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:81d7::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:81d8::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:8201::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:82fd::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:833e::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:8416::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:841c::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:8445::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:84a7::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:8535::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:85c1::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:85ff::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:8604::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:871a::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:875f::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:8773::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:87b2::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:c071::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:c0f6::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:c0f7::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:c10a::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:c174::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:c1a5::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:c1ca::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:c28f::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:c290::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:c2a7::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:c344::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:c3e9::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:c458::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:c45f::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:c460::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:c4c8::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:c4c9::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:c4db::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:c4f6::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:c515::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
| 2001:559:c538::/48 |
Comcast Cable Communications, LLC
|
1.2089× 1024 | ARIN | ALLOCATION |
Peers
AS21508 actively fosters the following peering relationships that enhance network performance through direct, settlement-free traffic exchange. Even with a modest number of peers, each connection serves as a strategic asset—optimizing routing, reducing latency, and minimizing transit costs.
Upstreams
AS21508 connects to the global Internet via at least 1 upstream provider. In this setup, AS21508 acts as a customer, subscribing to these transit services to obtain full BGP routing information and ensure reliable, redundant access to external networks.
Downstreams
AS21508 serves as a transit provider the following ASes, delivering the BGP routes needed for global connectivity. This downstream relationship underscores AS21508's role in extending Internet access beyond its own infrastructure.
AS2134
AS10794
AS11679
AS11739
AS14583
AS15173
AS15297
AS17381
AS18773
AS19404
AS19923
AS22274
AS23209
AS27326
AS27341
AS30299
AS32540
AS36040
AS36244
AS36364
AS40641
AS46643
AS54219
AS54391
AS54883
AS62971
AS63468
AS393415
AS393591
AS393613
AS394058
AS395441
AS395527
AS395772
AS396083
AS396452
AS397039
AS397190
AS397483
AS398475
AS399099
AS399232
AS399607
AS399938
AS400114