AS25 — UCB

AS25 announces 14 IPv4 prefixes covering 201,988 addresses and 17 IPv6 prefixes.

About this network

An early allocation (UCB) belonging to the University of California, Berkeley.

What it's used for

• Campus, research, and administrative networking for the university.

Notable

• A low AS number reflects an allocation from the internet's earliest years, handed out roughly sequentially. An institutional network, not a commercial ISP.

Interesting

• UC Berkeley produced BSD Unix, which carried the reference TCP/IP stack that shaped much of the early internet.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 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
• 169.229.0.0/16
• 169.236.240.0/21
• 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
• 2607:f140::/32
• 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::/34
• 2607:f380::118:9a40:31a0/123
• 2607:f380:1::118:9a43:2140/123

Upstream networks

• AS2152 CENIC

Adjacent networks

• AS2152 CENIC