HomeASN LookupAS31

AS31

🇺🇸

CIT - California Institute of Technologye8d4bb82379dad7e164461514a88eb06

ARINassigned
Announced Prefixes (BGP)
13total
12 IPv41 IPv6
IPv4 Addresses ⓘ
Allocated (RIR)132,352
Announced (BGP)134,144
IPv6 Addresses ⓘ
Allocated (RIR)7.9×10^28
Announced (BGP)7.9×10^28
Prefix Limit (IPv4)
200
Prefix Limit (IPv6)
5
Country
🇺🇸 US
RIR
ARIN
Status
assigned
Allocated
9/21/1984

Announced Prefixes

(BGP)13
|
Prefix
RPKI
IRR
Last Seen
131.215.0.0/16
No ROA
RADB
5/25/2026
131.215.229.0/24
No ROA—5/25/2026
131.215.230.0/24
No ROA—5/25/2026
131.215.234.0/24
No ROA—5/25/2026
131.215.239.0/24
No ROA—5/25/2026
131.215.240.0/24
No ROA—5/25/2026
131.215.242.0/23
No ROA—5/25/2026
131.215.244.0/23
No ROA—5/25/2026
134.4.0.0/16
No ROA
RADB
5/25/2026
192.12.19.0/24
No ROA
RADB
5/25/2026
1–10 of 13
1 / 2

Allocated Prefixes

(RIR)8
Prefix
Country
RIR
Status
131.215.0.0/16🇺🇸 USARINallocated
134.4.0.0/16🇺🇸 USARINallocated
192.12.19.0/24🇺🇸 USARINallocated
192.31.43.0/24🇺🇸 USARINallocated
192.41.208.0/24🇺🇸 USARINallocated
192.43.243.0/24🇺🇸 USARINallocated
192.54.249.0/24🇺🇸 USARINallocated
2607:f520::/32🇺🇸 USARINallocated
ASPA
No ASPA
External Links
ARIN WhoisHurricane Electric BGPRIPEstatPeeringDB
API
Open
GEThttps://api.ipctl.io/v1/asn/31

Returns ASN details, announced prefixes, and BGP routing data.

curl -s "https://api.ipctl.io/v1/asn/31" | jq