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ASN Lookup Tool
AS104 COLORADO-AS

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ASN Extended Info API & BGP Active Prefixes API
ASN Details
ASN
AS104
Organisation
University of Colorado at Boulder
Name
COLORADO-AS
Total IPv4 Addresses
91,136
Total IPv4 Prefixes
20
Total IPv6 Prefixes
2
Total IPv4 Bogon Prefixes
0
Total IPv6 Bogon Prefixes
0
IPv4 Space Rank
#2,042 out of 78,225
Registry
Arin
Registered Country
US flag US
Registered Country Name
United States of America (the)
Registered Date
1987-04-09
Registration Last Change
2019-06-25
Receiving From

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

ASN
Organisation
AS3356
US flagLevel 3 Parent, LLC
AS209
US flagCenturyLink Communications, LLC
AS14041
US flagUniversity Corporation for Atmospheric Research
IPv4 Active Prefixes

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

Prefix128.138.0.0/16
Range From128.138.0.0
Range To128.138.255.255
Prefix129.19.192.0/18
Range From129.19.192.0
Range To129.19.255.255
Prefix146.5.20.0/22
Range From146.5.20.0
Range To146.5.23.255
Prefix192.12.238.0/24
Range From192.12.238.0
Range To192.12.238.255
Prefix192.12.240.0/24
Range From192.12.240.0
Range To192.12.240.255
Showing 5 of 20
IPv6 Active Prefixes
Prefix2001:468:501::/48
Range From2001:468:501::
Range To2001:468:501:ffff:ffff:ffff:ffff:ffff
Prefix2620:18f::/32
Range From2620:18f::
Range To2620:18f:ffff:ffff:ffff:ffff:ffff:ffff
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.