AS13506 — US-DEPARTMENT-OF-THE-TREASURY

AS13506 announces 2 IPv4 prefixes covering 131,072 addresses and 2 IPv6 prefixes.

About this network

Two /16-sized ranges cut into twenty-four announcements, all under one netname, and nothing answering in DNS.

What it's used for

• A federal government department's network. 131,072 addresses across twenty-four IPv4 prefixes, two IPv6 /40s, and two observed BGP neighbours.

Notable

• Every block is netname US-DEPARTMENT-OF-THE-TREASURY, matching the AS handle exactly.
• The announcements split 164.95 and 166.123 into every size from a /17 down to /24s.
• Eighteen addresses were queried for reverse DNS and none returned a name.

Interesting

• Twenty-four routes out of two ranges, through only two upstreams, is fragmentation with no traffic engineering benefit visible from outside. What it does give is a specific announcement for every piece, so no part of the space can be announced by somebody else without an obvious conflict.
• A department this size having only two neighbours means its connectivity is bought through a small number of authorised paths rather than peered widely. Government networks are gated at the edge on purpose, and the routing table shows the gate.
• Not one sampled address answering, across 131,072 of them, is a reverse zone that was never populated or is not served publicly. For most organisations that is neglect; here it is consistent with publishing nothing that is not required.

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

Announced prefixes

• 164.95.0.0/16
• 166.123.0.0/16
• 2610:108:3100::/40
• 2610:108:4100::/40

Upstream networks

• AS6461 Zayo Bandwidth
• AS14244 NSI Hosting

Adjacent networks

• AS6461 Zayo Bandwidth
• AS14244 NSI Hosting