ASN AS26397 is an Autonomous System Number used to identify a network for BGP internet routing.

What do peers, upstreams, and downstreams mean in ASN data?

Peers are lateral network interconnections, upstreams are transit providers, and downstreams are customer networks receiving connectivity.

What are routes and IP ranges for an ASN?

Routes and IP ranges are the network prefixes announced by the ASN on the internet and show the address space it originates.

Why is WHOIS data shown for an ASN?

WHOIS data provides registration and contact context for ASN ownership, administration, and operational reference.

How can I access the full ASN tables?

The page shows a preview of large ASN datasets. Use the page controls to load more rows, and upgrade to a paid plan for complete access.

AS26397 The Regents of the University of California University of California, San Diego.

Q: Who manages ASN AS26397?

AS26397 is listed under The Regents of the University of California University of California, San Diego..

The Regents of the University of California University of California, San Diego. ucsd.edu

US 4 Routes

AS Data

AS26397

AS26397 – The Regents of the University of California University of California, San Diego.

AS Number	26397
AS Name	OPTIPUTER
Organization	The Regents of the University of California University of California, San Diego.(there-41)
Country	US
Website	ucsd.edu
Number of IPv4 Routes	4
Number of IPv6 Routes	0
ASN type	EDUCATION
Registry	ARIN
Date Allocated	2006-12-21

ASN Intelligence API for production workflows

Use ASN data for AS26397 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

Access complete peers, upstreams, downstreams, routes, WHOIS, and contact intelligence via our API. Learn more

Get ASN API Key ASN API Docs

IP Ranges

Route	Origin	Origin Name	ISP	# IPs
67.58.32.0/19	AS26397	The Regents of the University of California University of California, San Diego.	The Regents of the University of California University of California, San Diego.	8192
169.228.130.0/23	AS26397	The Regents of the University of California University of California, San Diego.	University of California, San Diego	512
67.58.48.0/20	AS26397	The Regents of the University of California University of California, San Diego.	The Regents of the University of California University of California, San Diego.	4096
169.228.132.0/24	AS26397	The Regents of the University of California University of California, San Diego.	University of California, San Diego	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:       26397
ASName:         OPTIPUTER
ASHandle:       AS26397
RegDate:        2006-12-21
Updated:        2015-10-19
Comment:        contact SDSC NOC for emergencies at 858-534-5090.  Request SDSC/PRISM Network Support    
Ref:            https://rdap.arin.net/registry/autnum/26397


OrgName:        The Regents of the University of California - University of California, San Diego.
OrgId:          THERE-41
Address:        Prism Project,University of California, San Diego
Address:        9500 Gilman Drive
Address:        MS-0505
City:           La Jolla
StateProv:      CA
PostalCode:     92093-0505
Country:        US
RegDate:        2009-05-15
Updated:        2024-04-17
Ref:            https://rdap.arin.net/registry/entity/THERE-41


OrgTechHandle: BDU62-ARIN
OrgTechName:   dunne, brian 
OrgTechPhone:  +1-858-334-9579 
OrgTechEmail:  bdunne@ucsd.edu
OrgTechRef:    https://rdap.arin.net/registry/entity/BDU62-ARIN

OrgTechHandle: TH60-ARIN
OrgTechName:   Hutton, Thomas 
OrgTechPhone:  +1-858-534-5136 
OrgTechEmail:  thomas.e.hutton@gmail.com
OrgTechRef:    https://rdap.arin.net/registry/entity/TH60-ARIN

OrgNOCHandle: SDSCN-ARIN
OrgNOCName:   SDSC NOC
OrgNOCPhone:  +1-858-534-5090 
OrgNOCEmail:  noc@sdsc.edu
OrgNOCRef:    https://rdap.arin.net/registry/entity/SDSCN-ARIN

OrgTechHandle: UTC1-ARIN
OrgTechName:   UCSD Technical Contact
OrgTechPhone:  +1-858-822-4040 
OrgTechEmail:  architects@ucsd.edu
OrgTechRef:    https://rdap.arin.net/registry/entity/UTC1-ARIN

OrgNOCHandle: TH60-ARIN
OrgNOCName:   Hutton, Thomas 
OrgNOCPhone:  +1-858-534-5136 
OrgNOCEmail:  thomas.e.hutton@gmail.com
OrgNOCRef:    https://rdap.arin.net/registry/entity/TH60-ARIN

OrgAbuseHandle: TH60-ARIN
OrgAbuseName:   Hutton, Thomas 
OrgAbusePhone:  +1-858-534-5136 
OrgAbuseEmail:  thomas.e.hutton@gmail.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/TH60-ARIN

RTechHandle: TECHO2-ARIN
RTechName:   Tech Optiputer
RTechPhone:  +1-858-534-3036 
RTechEmail:  tech@optiputer.net
RTechRef:    https://rdap.arin.net/registry/entity/TECHO2-ARIN

RNOCHandle: NOCOP5-ARIN
RNOCName:   NOC Optiputer
RNOCPhone:  +1-858-534-3036 
RNOCEmail:  noc@optiputer.net
RNOCRef:    https://rdap.arin.net/registry/entity/NOCOP5-ARIN

RAbuseHandle: PAPAD12-ARIN
RAbuseName:   Papadopoulos, Phil 
RAbusePhone:  +1-858-922-7305 
RAbuseEmail:  philip.papadopoulos@gmail.com
RAbuseRef:    https://rdap.arin.net/registry/entity/PAPAD12-ARIN

RTechHandle: SDSCN-ARIN
RTechName:   SDSC NOC
RTechPhone:  +1-858-534-5090 
RTechEmail:  noc@sdsc.edu
RTechRef:    https://rdap.arin.net/registry/entity/SDSCN-ARIN

RNOCHandle: SDSCN-ARIN
RNOCName:   SDSC NOC
RNOCPhone:  +1-858-534-5090 
RNOCEmail:  noc@sdsc.edu
RNOCRef:    https://rdap.arin.net/registry/entity/SDSCN-ARIN

RAbuseHandle: ABUSE1467-ARIN
RAbuseName:   Abuse Optiputer
RAbusePhone:  +1-858-534-3036 
RAbuseEmail:  abuse@optiputer.net
RAbuseRef:    https://rdap.arin.net/registry/entity/ABUSE1467-ARIN

RNOCHandle: PAPAD12-ARIN
RNOCName:   Papadopoulos, Phil 
RNOCPhone:  +1-858-922-7305 
RNOCEmail:  philip.papadopoulos@gmail.com
RNOCRef:    https://rdap.arin.net/registry/entity/PAPAD12-ARIN

RTechHandle: TH60-ARIN
RTechName:   Hutton, Thomas 
RTechPhone:  +1-858-534-5136 
RTechEmail:  thomas.e.hutton@gmail.com
RTechRef:    https://rdap.arin.net/registry/entity/TH60-ARIN

RAbuseHandle: TH60-ARIN
RAbuseName:   Hutton, Thomas 
RAbusePhone:  +1-858-534-5136 
RAbuseEmail:  thomas.e.hutton@gmail.com
RAbuseRef:    https://rdap.arin.net/registry/entity/TH60-ARIN

RNOCHandle: TH60-ARIN
RNOCName:   Hutton, Thomas 
RNOCPhone:  +1-858-534-5136 
RNOCEmail:  thomas.e.hutton@gmail.com
RNOCRef:    https://rdap.arin.net/registry/entity/TH60-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
AS7377	University of California, San Diego	US
AS293	ESnet	US

Upstreams

AS Number	Description	Country
AS2153	CENIC	US
AS7377	University of California, San Diego	US

ASN Lookup Tool

ASN Summary