Autonomous System
AS31 California Institute of Technology
EducationActiveUnited StatesARIN
AS31 (CIT) is an education network operated by California Institute of Technology in United States, registered with ARIN. It has 12 IPv4 prefixes with 134,144 addresses and 1 IPv6 prefix, which makes it the 1,778th largest of 82,200 active autonomous systems by IPv4 space.
IPv4 addresses134,144in 12 prefixes
IPv6 prefixes1≈ 7.9 × 10²⁸ addresses
Size rank#1,778of 82,200 active ASNs
Details
OrganizationCalifornia Institute of Technology
AS nameCIT
Websitecaltech.edu
Country United States (US)
Network typeEducation
RegistryARIN
Abuse contactnoc@caltech.edu
Registered1984-09-21
Last updated2023-08-29
IPv4 prefixes
12 prefixes · 134,144 addresses| Network | Addresses | First – last address |
|---|---|---|
| 131.215.0.0/16 | 65,536 | 131.215.0.0 – 131.215.255.255 |
| 134.4.0.0/16 | 65,536 | 134.4.0.0 – 134.4.255.255 |
| 131.215.242.0/23 | 512 | 131.215.242.0 – 131.215.243.255 |
| 131.215.244.0/23 | 512 | 131.215.244.0 – 131.215.245.255 |
| 131.215.229.0/24 | 256 | 131.215.229.0 – 131.215.229.255 |
| 131.215.230.0/24 | 256 | 131.215.230.0 – 131.215.230.255 |
| 131.215.234.0/24 | 256 | 131.215.234.0 – 131.215.234.255 |
| 131.215.239.0/24 | 256 | 131.215.239.0 – 131.215.239.255 |
| 131.215.240.0/24 | 256 | 131.215.240.0 – 131.215.240.255 |
| 192.12.19.0/24 | 256 | 192.12.19.0 – 192.12.19.255 |
| 192.31.43.0/24 | 256 | 192.31.43.0 – 192.31.43.255 |
| 192.41.208.0/24 | 256 | 192.41.208.0 – 192.41.208.255 |
131.215.0.0/16 134.4.0.0/16 131.215.242.0/23 131.215.244.0/23 131.215.229.0/24 131.215.230.0/24 131.215.234.0/24 131.215.239.0/24 131.215.240.0/24 192.12.19.0/24 192.31.43.0/24 192.41.208.0/24
IPv6 prefixes
1 prefix- 2607:f520::/32
2607:f520::/32
Query AS31 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=AS31&key=YOUR_API_KEY"Any address in its prefixes resolves to AS31, with or without a key:
curl "https://api.ipapi.is/?q=131.215.0.1"Largest networks in United States
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