AS257 — DNIC-AS-00257

AS257 announces 8 IPv4 prefixes covering 716 addresses and 5 IPv6 prefixes.

About this network

An early US Department of Defense allocation (DNIC-AS-00257), registered through the DoD Network Information Center (DNIC), which holds many federal ASNs.

What it's used for

• US government / military networking. The generic DNIC registration does not identify a specific base or unit.

Notable

• A US government / DoD network, not a commercial ISP or host.
• The low AS number reflects a very early allocation, handed out roughly sequentially in the internet's first years.

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

Announced prefixes

• 137.164.24.188/31
• 137.164.50.148/30
• 137.164.50.252/30
• 204.102.228.128/25
• 204.102.229.0/24
• 204.102.230.112/31
• 205.155.65.0/24
• 209.129.248.192/26
• 2607:f380:1::108:9a41:8bc0/123
• 2607:f380:1::118:9a43:2940/122
• 2607:f380:1::118:9a43:2fc0/122
• 2607:f380:1::11c:c66e:6700/123
• 2607:f380:804::/48

Upstream networks

• AS2152 CENIC
• AS2153 CENIC

Adjacent networks

• AS2152 CENIC
• AS2153 CENIC