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 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
Comcast Cable Communications, LLC
Transit To
ASN
Organisation
Cloudflare, Inc.
Santander Global Technology, S.L.U
Newmarket Corporation
Virginia State University
Sentara Healthcare
Allianz Technology SE
MGW Telephone Company, Inc.
nexVortex
Williams-Sonoma
Inova Health System Foundation
Active Prefixes IPv6
Prefix
Range From
Range To
Prefix
2001:558:701a::/48
Range From
2001:558:701a::
Prefix
2001:558:fe30::/48
Range From
2001:558:fe30::
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