ASN Lookup Tool

California Institute of Technology caltech.edu US US 13 Routes

AS Data

AS31

AS31 – California Institute of Technology

AS Number 31
AS Name CIT
Organization California Institute of Technology(cit-4-z)
Country US
Website caltech.edu
Number of IPv4 Routes 12
Number of IPv6 Routes 1
ASN type EDUCATION
Registry ARIN
Date Allocated 1984-09-21

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IP Ranges

Route # IPs
131.215.244.0/23 512
131.215.234.0/24 256
2607:f520::/32 ~79×10²⁷
131.215.242.0/23 512
131.215.240.0/24 256
192.12.19.0/24 256
131.215.0.0/16 65536
192.41.208.0/24 256
134.4.0.0/16 65536
131.215.230.0/24 256

Raw Whois Response

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#


ASNumber:       31
ASName:         CIT
ASHandle:       AS31
RegDate:        1984-09-21
Updated:        2023-08-29    
Ref:            https://rdap.arin.net/registry/autnum/31


OrgName:        California Institute of Technology
OrgId:          CIT-4-Z
Address:        1200 East California Boulevard
Address:        MS 1-10
City:           Pasadena
StateProv:      CA
PostalCode:     91125
Country:        US
RegDate:        2023-08-22
Updated:        2023-08-22
Ref:            https://rdap.arin.net/registry/entity/CIT-4-Z


OrgTechHandle: CI2-ORG-ARIN
OrgTechName:   Caltech Network Operations Center
OrgTechPhone:  +1-626-395-3500 
OrgTechEmail:  noc@caltech.edu
OrgTechRef:    https://rdap.arin.net/registry/entity/CI2-ORG-ARIN

OrgAbuseHandle: CI2-ORG-ARIN
OrgAbuseName:   Caltech Network Operations Center
OrgAbusePhone:  +1-626-395-3500 
OrgAbuseEmail:  noc@caltech.edu
OrgAbuseRef:    https://rdap.arin.net/registry/entity/CI2-ORG-ARIN

RTechHandle: CI2-ORG-ARIN
RTechName:   Caltech Network Operations Center
RTechPhone:  +1-626-395-3500 
RTechEmail:  noc@caltech.edu
RTechRef:    https://rdap.arin.net/registry/entity/CI2-ORG-ARIN


#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#

Parsed Whois Response

Peers

AS Number Description Country
AS2153 CENIC US
AS13335 Cloudflare, Inc. US
AS2152 CENIC US

Upstreams

AS Number Description Country
AS2153 CENIC US
AS13335 Cloudflare, Inc. US
AS2152 CENIC US

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Frequently Asked Questions

ASN AS31 is an Autonomous System Number used to identify a network for BGP internet routing.
AS31 is listed under California Institute of Technology.
Peers are lateral network interconnections, upstreams are transit providers, and downstreams are customer networks receiving connectivity.
Routes and IP ranges are the network prefixes announced by the ASN on the internet and show the address space it originates.
WHOIS provides registration and contact context for ASN ownership, administration, and operational reference.
This page previews large ASN datasets. Use See more to load additional rows, and upgrade your plan to view complete peer, route, upstream, and downstream data.