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ASN Lookup Tool
AS21508 Comcast Cable Communications, LLC

An Autonomous System (AS) is a network (or collection of networks) that are all managed and supervised by a single entity or organisation. This tool provides a comprehensive ownership and connectivity report for any given AS number.

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ASN Lookup for:

AS21508

Powered By:
ASN Extended Info API
BGP Active Prefixes API
ASN Details JSON View

ASN Details

ASN
AS21508
Organisation
Comcast Cable Communications, LLC
AS Name
COMCAST-21508
IPv4 Addresses Announced
1,248,463
IPv4 Prefixes Announced
163
IPv6 Prefixes Announced
94
IPv4 Bogon Prefixes
0
IPv6 Bogon Prefixes
0
IPv4 Space Rank
#323 out of 75,565
Registry
Arin
Registered Country
US
Registration Date
2001-05-16
Registration Change
2021-01-25

Receiving From

ASN
Organisation
AS7922
Comcast Cable Communications, LLC

Transit To

ASN
Organisation
AS13335
Cloudflare, Inc.
AS2134
Santander Global Technology, S.L.U
AS15173
Newmarket Corporation
AS395527
Virginia State University
AS27336
Sentara Healthcare
AS8360
Allianz Technology SE
AS40641
MGW Telephone Company, Inc.
AS46847
nexVortex
AS17381
Williams-Sonoma
AS393861
Inova Health System Foundation

Active Prefixes IPv4

Prefix
Range From
Range To
Prefix 141.104.0.0/16
Range From 141.104.0.0
Range To 141.104.255.255
Prefix 157.240.147.0/24
Range From 157.240.147.0
Range To 157.240.147.255
Prefix 157.240.148.0/24
Range From 157.240.148.0
Range To 157.240.148.255
Prefix 162.151.162.0/23
Range From 162.151.162.0
Range To 162.151.163.255
Prefix 162.151.255.0/24
Range From 162.151.255.0
Range To 162.151.255.255
Prefix 162.151.58.0/23
Range From 162.151.58.0
Range To 162.151.59.255
Prefix 173.14.112.0/20
Range From 173.14.112.0
Range To 173.14.127.255
Prefix 173.14.193.0/24
Range From 173.14.193.0
Range To 173.14.193.255
Prefix 173.15.192.0/20
Range From 173.15.192.0
Range To 173.15.207.255
Prefix 173.163.192.0/20
Range From 173.163.192.0
Range To 173.163.207.255
Showing 10 of 163 Results View More >

Active Prefixes IPv6

Prefix
Range From
Range To
Prefix 2001:558:180::/44
Range From 2001:558:180::
Range To 2001:558:18f:ffff:ffff:ffff:ffff:ffff
Prefix 2001:558:230::/44
Range From 2001:558:230::
Range To 2001:558:23f:ffff:ffff:ffff:ffff:ffff
Prefix 2001:558:701a::/48
Range From 2001:558:701a::
Range To 2001:558:701a:ffff:ffff:ffff:ffff:ffff
Prefix 2001:558:fe30::/48
Range From 2001:558:fe30::
Range To 2001:558:fe30:ffff:ffff:ffff:ffff:ffff
Prefix 2001:559:220::/48
Range From 2001:559:220::
Range To 2001:559:220:ffff:ffff:ffff:ffff:ffff
Prefix 2001:559:243::/48
Range From 2001:559:243::
Range To 2001:559:243:ffff:ffff:ffff:ffff:ffff
Prefix 2001:559:280::/48
Range From 2001:559:280::
Range To 2001:559:280:ffff:ffff:ffff:ffff:ffff
Prefix 2001:559:37d::/48
Range From 2001:559:37d::
Range To 2001:559:37d:ffff:ffff:ffff:ffff:ffff
Prefix 2001:559:39d::/48
Range From 2001:559:39d::
Range To 2001:559:39d:ffff:ffff:ffff:ffff:ffff
Prefix 2001:559:3ac::/48
Range From 2001:559:3ac::
Range To 2001:559:3ac:ffff:ffff:ffff:ffff:ffff
Showing 10 of 94 Results View More >