AS31

Name: AS31 — California Institute of Technology
Creator: ipdex

California Institute of Technology Unknown registered in United States

12IPv4 prefixes

1IPv6 prefixes

#12,710AS Rank

327/327RIS visibility

#2,580Rank in United States

1984-09-21Allocated

California Institute of Technology (AS31) — Unknown, registered in United States. announces 12 IPv4 prefixes + 1 IPv6 prefixes. Rank in United States: #2580. Allocated: 1984-09-21.

IPv4 12IPv6 1

Announced prefixes · 13

v4 131.215.0.0/16 unknown
v4 131.215.229.0/24 unknown
v4 131.215.230.0/24 unknown
v4 131.215.234.0/24 unknown
v4 131.215.239.0/24 unknown
v4 131.215.240.0/24 unknown
v4 131.215.242.0/23 unknown
v4 131.215.244.0/23 unknown
v4 134.4.0.0/16 unknown
v4 192.12.19.0/24 unknown
v4 192.31.43.0/24 unknown
v4 192.41.208.0/24 unknown
v6 2607:f520::/32 unknown

Routing: 12 IPv4 · 1 IPv6 announced · RIS visibility 327/327 RIS peers · RIPEstat · 2026-06-17

Prefix history

Announced prefixes Source: ipdex daily snapshot · sparse rows, value holds until the next change (steps)

Data table

Day	Announced prefixes
2026-06-12	13
2026-06-13	13

AS topology · Customer cone 1

Providers · 3

AS13335 Cloudflare, Inc.
AS2152 CENIC
AS2153 CENIC

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