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AS25 University of California at Berkeley

UCB - University of California at Berkeley · registered in the United States

IPv4 addresses199,94015 prefixes · 0.006% of announced IPv4
Rank in United States#320largest network in US by IPv4 space, of 18,338 · 0.01% of US
Rank worldwide#1,084of 79,396 networks with IPv4
IPv665,535 x /4832 prefixes
CountryUnited States18,679 ASNs registered there
Open AS25 in ASN lookup Look up an IP in this network (67.21.36.1) All networks in United States

IPv4 prefixes

All 15 prefixes, in address order.

  • 67.21.36.0/24
  • 128.32.0.0/16
  • 136.152.0.0/16
  • 137.164.3.26/31
  • 137.164.50.20/31
  • 169.229.0.0/17
  • 169.229.128.0/18
  • 169.229.192.0/18
  • 192.12.234.0/24
  • 192.35.209.0/24
  • 192.150.186.0/23
  • 192.154.4.0/23
  • 192.154.6.0/24
  • 208.68.240.0/22
  • 209.129.246.0/24

IPv6 prefixes

All 32 prefixes.

  • 2607:f140::/33
  • 2607:f140:8000::/35
  • 2607:f140:a001::/48
  • 2607:f140:a002::/47
  • 2607:f140:a004::/46
  • 2607:f140:a008::/45
  • 2607:f140:a010::/44
  • 2607:f140:a020::/43
  • 2607:f140:a040::/42
  • 2607:f140:a080::/41
  • 2607:f140:a100::/40
  • 2607:f140:a200::/39
  • 2607:f140:a400::/38
  • 2607:f140:a800::/37
  • 2607:f140:b000::/36
  • 2607:f140:c000::/35
  • 2607:f140:e000::/48
  • 2607:f140:e001::/48
  • 2607:f140:e002::/47
  • 2607:f140:e004::/46
  • 2607:f140:e008::/45
  • 2607:f140:e010::/44
  • 2607:f140:e020::/43
  • 2607:f140:e040::/42
  • 2607:f140:e080::/41
  • 2607:f140:e100::/40
  • 2607:f140:e200::/39
  • 2607:f140:e400::/38
  • 2607:f140:e800::/37
  • 2607:f140:f000::/36
  • 2607:f380::118:9a40:31a0/123
  • 2607:f380:1::118:9a43:2140/123

Other ASNs named University of California at Berkeley

1 other network uses the same organisation name; together with AS25 they announce 201,492 IPv4 addresses.

ASNNameIPv4 addresses
AS393282UCB-1 - University of California at Berkeley US1,552

Similar-sized networks in United States

ASNNameIPv4 addresses
AS1637#317 DNIC-AS-01637 - Headquarters, USAISC201,728
AS400619#318 AROSS-AS - AROSSCLOUD INC.201,472
AS6431#319 ATT-RESEARCH - AT&T Enterprises, LLC200,192
AS1602#321 DNIC-AS-01602 - Headquarters, USAISC199,936
AS30449#322 AZSTATE - State of Arizona199,168
AS13541#323 SIEMENS-DISW-WIV-B-ORW - Siemens Industry Software Inc.198,656

IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources