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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
#2,104 out of 79,143
Registry
Arin
Registered Country
US flagUS
Registered Country Name
United States of America (the)
Registered Date
1987-04-09
Registration Last Change
2019-06-25
Receiving From
ASN
Organisation
AS3356
US flagLevel 3 Parent, LLC
AS209
US flagCenturyLink Communications, LLC
AS14041
US flagUniversity Corporation for Atmospheric Research
IPv4 Active Prefixes
PrefixRange FromRange To
128.138.0.0/16128.138.0.0128.138.255.255
129.19.192.0/18129.19.192.0129.19.255.255
146.5.20.0/22146.5.20.0146.5.23.255
192.12.238.0/24192.12.238.0192.12.238.255
192.12.240.0/24192.12.240.0192.12.240.255
Showing 5 of 20
IPv6 Active Prefixes
PrefixRange FromRange To
2001:468:501::/482001:468:501::2001:468:501:ffff:ffff:ffff:ffff:ffff
2620:18f::/322620:18f::2620:18f:ffff:ffff:ffff:ffff:ffff:ffff