University of Colorado at Boulder
AS104 is University of Colorado at Boulder (colorado.edu). It announces 91,136 IPv4 addresses in 21 prefixes, and 4 IPv6 prefixes.
United States· ARIN· allocated 1987-04-09· education
Where its space is
The IPv4 it announces that IP Geolocation places, by country. A /24 counts for the AS announcing most of it.
- United States91,136 · 100.00%
Registry record
Its ASN Whois record, as the registry publishes it.
- handle
- COLORADO-AS
- name
- University of Colorado at Boulder
- org
- UCAB-2
- org name
- University of Colorado at Boulder
- org address
- Campus Box 455, Boulder, CO, 80309-0455
- org city
- Boulder
- org country
- US
- country
- US
- source
- arin
- created
- 1987-04-09
- updated
- 2019-06-25
- abuse name
- Abuse
- abuse email
- abuse@colorado.edu
- abuse phone
- +1-303-735-4357
- abuse kind
- role
- abuse city
- Boulder
- abuse country
- US
- admin name
- CUBoulder
- admin email
- arinadmin@colorado.edu
- admin phone
- +1-303-735-4357
- admin kind
- role
- admin city
- Boulder
- admin country
- US
- tech
- CUBOU-ARIN
- tech name
- CUBoulder
- tech email
- arinadmin@colorado.edu
- tech phone
- +1-303-735-4357
- tech kind
- role
- tech city
- Boulder
- tech country
- US
What the databases see
Addresses each address-keyed database holds in the IPv4 it announces, as a share of that space, with its largest providers. Counts overlap.
- VPN IP300.03%
- geonode, anyip, thordata0.18%
- None here
- None here
- None here
- None here
- Hosting IP44,54448.88%
- None here
- None here
- None here
- SSH IP1250.14%
- 0.01%
- 0.01%
IPv4 prefixes
Every IPv4 prefix BGP Route saw it announce. A prefix another AS also announces says so.
| PREFIX | COUNTRY | RPKI | PEERS | FIRST SEEN |
|---|---|---|---|---|
| 128.138.0.0/16 | United States | not found | 19 | 2026-10-02 |
| 129.19.192.0/18 | United States | valid | 19 | 2026-10-02 |
| 129.19.240.0/20 | United States | valid | 19 | 2026-10-02 |
| 146.5.20.0/22 | United States | not found | 19 | 2026-10-02 |
| 192.12.238.0/24 | United States | not found | 19 | 2026-10-02 |
| 192.12.240.0/24 | United States | not found | 19 | 2026-10-02 |
| 192.12.241.0/24 | United States | not found | 19 | 2026-10-02 |
| 192.12.242.0/24 | United States | not found | 19 | 2026-10-02 |
| 192.12.244.0/24 | United States | not found | 19 | 2026-10-02 |
| 192.12.245.0/24 | United States | not found | 19 | 2026-10-02 |
| 198.11.16.0/20 | United States | not found | 19 | 2026-10-02 |
| 198.59.7.0/24 | United States | not found | 19 | 2026-10-02 |
| 198.59.51.0/24 | United States | not found | 19 | 2026-10-02 |
| 198.59.52.0/24 | United States | not found | 19 | 2026-10-02 |
| 198.59.54.0/24 | United States | not found | 19 | 2026-10-02 |
| 198.59.55.0/24 | United States | not found | 19 | 2026-10-02 |
| 198.59.70.0/24 | United States | not found | 19 | 2026-10-02 |
| 198.59.81.0/24 | United States | not found | 19 | 2026-10-02 |
| 198.59.82.0/24 | United States | not found | 19 | 2026-10-02 |
| 198.59.83.0/24 | United States | not found | 19 | 2026-10-02 |
| 204.228.80.0/24 | United States | not found | 19 | 2026-10-02 |
IPv6 prefixes
Every IPv6 prefix BGP Route saw it announce.
| PREFIX | COUNTRY | RPKI | PEERS | FIRST SEEN |
|---|---|---|---|---|
| 2001:468:501::/48 | United States | valid | 2 | 2026-10-02 |
| 2401:eee0:1c0::/42 | Bangladesh | invalid:origin | 3 | 2026-10-02 |
| 2401:eee0:200::/42 | Bangladesh | invalid:origin | 3 | 2026-10-02 |
| 2620:18f::/32 | United States | not found | 20 | 2026-10-02 |
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