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ASN Lookup Tool
AS31 CIT

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ASN Extended Info API & BGP Active Prefixes API
ASN Details
ASN
AS31
Organisation
California Institute of Technology
Name
CIT
Total IPv4 Addresses
131,850
Total IPv4 Prefixes
26
Total IPv6 Prefixes
3
Total IPv4 Bogon Prefixes
0
Total IPv6 Bogon Prefixes
0
IPv4 Space Rank
#1,539 out of 78,221
Registry
Arin
Registered Country
US flag US
Registered Country Name
United States of America (the)
Registered Date
1984-09-21
Registration Last Change
2023-08-29
Receiving From

The list of active Autonomous Systems (ASs) which send traffic to that ASN.

ASN
Organisation
AS2152
US flagCENIC
AS13335
US flagCloudflare, Inc.
AS226
US flagLos Nettos
AS2153
US flagCENIC
IPv4 Active Prefixes

This provides the list of IPv4 address space routes/prefixes currently announced on Border Gateway Protocol (BGP).

Prefix131.215.0.0/17
Range From131.215.0.0
Range To131.215.127.255
Prefix131.215.128.0/18
Range From131.215.128.0
Range To131.215.191.255
Prefix131.215.192.0/19
Range From131.215.192.0
Range To131.215.223.255
Prefix131.215.224.0/22
Range From131.215.224.0
Range To131.215.227.255
Prefix131.215.228.0/24
Range From131.215.228.0
Range To131.215.228.255
Showing 5 of 26
IPv6 Active Prefixes
Prefix2607:f380:1::118:9a40:34a0/123
Range From2607:f380:1::118:9a40:34a0
Range To2607:f380:1::118:9a40:34bf
Prefix2607:f380:1::118:9a41:8480/121
Range From2607:f380:1::118:9a41:8480
Range To2607:f380:1::118:9a41:84ff
Prefix2607:f520::/32
Range From2607:f520::
Range To2607:f520:ffff:ffff:ffff:ffff:ffff:ffff
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.