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ASN Lookup Tool
AS21508 COMCAST-21508

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ASN Extended Info API & BGP Active Prefixes API
ASN Details
ASN
AS21508
Organisation
Comcast Cable Communications, LLC
Name
COMCAST-21508
Total IPv4 Addresses
1266172
Total IPv4 Prefixes
165
Total IPv6 Prefixes
79
Total IPv4 Bogon Prefixes
0
Total IPv6 Bogon Prefixes
0
IPv4 Space Rank
#318 out of 77,288
Registry
Arin
Registered Country
US flag US
Registered Country Name
United States of America (the)
Registered Date
2001-05-16
Registration Last Change
2021-01-25
Receiving From

The list of active Autonomous Systems (ASs) which send traffic to that ASN.

ASN
Organisation
AS7922
US flagComcast Cable Communications, LLC
Transit To

The list of active Autonomous Systems (ASs) which receive traffic from that ASN.

 

ASN
Organisation
AS13335
US flagCloudflare, Inc.
AS2134
ES flagSantander Global Technology, S.L.U
AS15173
US flagNewmarket Corporation
AS395527
ZZ flagProxy registered route object for Virginia State..
AS27336
US flagSentara Healthcare
Showing 5 of 48
IPv4 Active Prefixes

This provides the list of IPv4 address space routes/prefixes currently announced on Border Gateway Protocol (BGP).

Prefix23.25.96.0/19
Range From23.25.96.0
Range To23.25.127.255
Prefix23.25.186.0/23
Range From23.25.186.0
Range To23.25.187.255
Prefix23.31.96.0/20
Range From23.31.96.0
Range To23.31.111.255
Prefix24.124.151.0/24
Range From24.124.151.0
Range To24.124.151.255
Prefix24.124.162.0/23
Range From24.124.162.0
Range To24.124.163.255
Showing 5 of 165
IPv6 Active Prefixes
Prefix2001:558:180::/44
Range From2001:558:180::
Range To2001:558:18f:ffff:ffff:ffff:ffff:ffff
Prefix2001:558:230::/44
Range From2001:558:230::
Range To2001:558:23f:ffff:ffff:ffff:ffff:ffff
Prefix2001:558:701a::/48
Range From2001:558:701a::
Range To2001:558:701a:ffff:ffff:ffff:ffff:ffff
Prefix2001:558:fe30::/48
Range From2001:558:fe30::
Range To2001:558:fe30:ffff:ffff:ffff:ffff:ffff
Prefix2001:559:8a::/48
Range From2001:559:8a::
Range To2001:559:8a:ffff:ffff:ffff:ffff:ffff
Showing 5 of 79
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.