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
74752
Total IPv4 Prefixes
19
Total IPv6 Prefixes
2
Total IPv4 Bogon Prefixes
0
Total IPv6 Bogon Prefixes
0
IPv4 Space Rank
#2,378 out of 76,964
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
US flagCenturyLink Communications, LLC
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).

Range From146.5.20.0
Range To146.5.23.255
Showing 5 of 19
IPv6 Active Prefixes
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.