ASN AS25 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS25?

AS25 is listed under University of California at Berkeley.

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.

AS25 University of California at Berkeley

ASN Lookup Tool

University of California at Berkeley berkeley.edu

US 15 Routes

AS Data

AS25

AS25 – University of California at Berkeley

AS Number	25
AS Name	UCB
Organization	University of California at Berkeley(ucab-1-z)
Country	US
Website	berkeley.edu
Number of IPv4 Routes	13
Number of IPv6 Routes	2
ASN type	EDUCATION
Registry	ARIN
Date Allocated	1984-08-03

ASN Intelligence API for production workflows

Use ASN data for AS25 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
67.21.36.0/24	AS25	University of California at Berkeley	ICSI	256
192.150.186.0/23	AS25	University of California at Berkeley	University of California at Berkeley	512
192.35.209.0/24	AS25	University of California at Berkeley	University of California Office of the President	256
169.229.0.0/16	AS25	University of California at Berkeley	University of California at Berkeley	65536
192.154.6.0/24	AS25	University of California at Berkeley	University of California at Berkeley	256
208.68.240.0/22	AS25	University of California at Berkeley	SETIATHOME	1024
169.236.240.0/21	AS25	University of California at Berkeley	University of California, Merced	2048
128.32.0.0/16	AS25	University of California at Berkeley	University of California at Berkeley	65536
2607:f140::/32	AS25	University of California at Berkeley	University of California at Berkeley	~79×10²⁷
192.154.4.0/23	AS25	University of California at Berkeley	University of California at Berkeley	512

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:       25
ASName:         UCB
ASHandle:       AS25
RegDate:        1984-08-03
Updated:        2023-12-14
Comment:        DMCA Designated Agent is policy@berkeley.edu    
Ref:            https://rdap.arin.net/registry/autnum/25


OrgName:        University of California at Berkeley
OrgId:          UCAB-1-Z
Address:        IST - Telecommunications
Address:        ATTN Network Services and Operations
Address:        2850 Telegraph Ave
Address:        NOTE See Comment for DMCA INFO
City:           Berkeley
StateProv:      CA
PostalCode:     94705
Country:        US
RegDate:        2010-01-13
Updated:        2023-07-20
Comment:        DMCA Designated Agent is dmca@berkeley.edu
Ref:            https://rdap.arin.net/registry/entity/UCAB-1-Z


OrgNOCHandle: UCB-NOC-ARIN
OrgNOCName:   IST Communication and Network Services
OrgNOCPhone:  +1-510-664-9000 
OrgNOCEmail:  noc@berkeley.edu
OrgNOCRef:    https://rdap.arin.net/registry/entity/UCB-NOC-ARIN

OrgAbuseHandle: UCBSE-ARIN
OrgAbuseName:   UCB-SECURIT-ARIN
OrgAbusePhone:  +1-510-664-9000 
OrgAbuseEmail:  abuse@security.berkeley.edu
OrgAbuseRef:    https://rdap.arin.net/registry/entity/UCBSE-ARIN

OrgTechHandle: UCB-NOC-ARIN
OrgTechName:   IST Communication and Network Services
OrgTechPhone:  +1-510-664-9000 
OrgTechEmail:  noc@berkeley.edu
OrgTechRef:    https://rdap.arin.net/registry/entity/UCB-NOC-ARIN

RNOCHandle: UCB-NOC-ARIN
RNOCName:   IST Communication and Network Services
RNOCPhone:  +1-510-664-9000 
RNOCEmail:  noc@berkeley.edu
RNOCRef:    https://rdap.arin.net/registry/entity/UCB-NOC-ARIN

RTechHandle: UCB-NOC-ARIN
RTechName:   IST Communication and Network Services
RTechPhone:  +1-510-664-9000 
RTechEmail:  noc@berkeley.edu
RTechRef:    https://rdap.arin.net/registry/entity/UCB-NOC-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
AS2152	CENIC	US

Upstreams

AS Number	Description	Country
AS2152	CENIC	US

Contacts

Email Contacts

noc@berkeley.edu

Abuse Contacts

abuse@security.berkeley.edu