Autonomous System
AS104 University of Colorado at Boulder
EducationActiveUnited StatesARIN
AS104 (COLORADO-AS) is an education network operated by University of Colorado at Boulder in United States, registered with ARIN. It has 21 IPv4 prefixes with 95,232 addresses and 1 IPv6 prefix, which makes it the 2,405th largest of 82,200 active autonomous systems by IPv4 space.
IPv4 addresses95,232in 21 prefixes
IPv6 prefixes1≈ 7.9 × 10²⁸ addresses
Size rank#2,405of 82,200 active ASNs
Details
OrganizationUniversity of Colorado at Boulder
AS nameCOLORADO-AS
Websitecolorado.edu
Country United States (US)
Network typeEducation
RegistryARIN
Abuse contactabuse@colorado.edu
Registered1987-04-09
Last updated2019-06-25
IPv4 prefixes
21 prefixes · 95,232 addresses| Network | Addresses | First – last address |
|---|---|---|
| 128.138.0.0/16 | 65,536 | 128.138.0.0 – 128.138.255.255 |
| 129.19.192.0/18 | 16,384 | 129.19.192.0 – 129.19.255.255 |
| 129.19.240.0/20 | 4,096 | 129.19.240.0 – 129.19.255.255 |
| 198.11.16.0/20 | 4,096 | 198.11.16.0 – 198.11.31.255 |
| 146.5.20.0/22 | 1,024 | 146.5.20.0 – 146.5.23.255 |
| 192.12.238.0/24 | 256 | 192.12.238.0 – 192.12.238.255 |
| 192.12.240.0/24 | 256 | 192.12.240.0 – 192.12.240.255 |
| 192.12.241.0/24 | 256 | 192.12.241.0 – 192.12.241.255 |
| 192.12.242.0/24 | 256 | 192.12.242.0 – 192.12.242.255 |
| 192.12.244.0/24 | 256 | 192.12.244.0 – 192.12.244.255 |
| 192.12.245.0/24 | 256 | 192.12.245.0 – 192.12.245.255 |
| 198.59.7.0/24 | 256 | 198.59.7.0 – 198.59.7.255 |
| 198.59.51.0/24 | 256 | 198.59.51.0 – 198.59.51.255 |
| 198.59.52.0/24 | 256 | 198.59.52.0 – 198.59.52.255 |
| 198.59.54.0/24 | 256 | 198.59.54.0 – 198.59.54.255 |
| 198.59.55.0/24 | 256 | 198.59.55.0 – 198.59.55.255 |
| 198.59.70.0/24 | 256 | 198.59.70.0 – 198.59.70.255 |
| 198.59.81.0/24 | 256 | 198.59.81.0 – 198.59.81.255 |
| 198.59.82.0/24 | 256 | 198.59.82.0 – 198.59.82.255 |
| 198.59.83.0/24 | 256 | 198.59.83.0 – 198.59.83.255 |
| 204.228.80.0/24 | 256 | 204.228.80.0 – 204.228.80.255 |
128.138.0.0/16 129.19.192.0/18 129.19.240.0/20 198.11.16.0/20 146.5.20.0/22 192.12.238.0/24 192.12.240.0/24 192.12.241.0/24 192.12.242.0/24 192.12.244.0/24 192.12.245.0/24 198.59.7.0/24 198.59.51.0/24 198.59.52.0/24 198.59.54.0/24 198.59.55.0/24 198.59.70.0/24 198.59.81.0/24 198.59.82.0/24 198.59.83.0/24 204.228.80.0/24
IPv6 prefixes
1 prefix- 2620:18f::/32
2620:18f::/32
Query AS104 with the API
The ASN lookup returns everything on this page as JSON, including every prefix. ASN lookups need an API key: a free account comes with 1,000 requests a day.
curl "https://api.ipapi.is/?q=AS104&key=YOUR_API_KEY"Any address in its prefixes resolves to AS104, with or without a key:
curl "https://api.ipapi.is/?q=128.138.0.1"Largest networks in United States
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