AS15130 — USDOJ-GOV

AS15130 announces 34 IPv4 prefixes covering 16,128 addresses and 5 IPv6 prefixes.

About this network

A federal department with thirty-four announcements and one observed upstream.

What it's used for

• A national justice department's network. Thirty-four IPv4 prefixes and seventeen IPv6 prefixes announced from the United States, with a single observed BGP neighbour.

Notable

• Every IPv4 prefix falls inside 149.101, split down to individual /24 blocks, so one allocation is announced as thirty-four separate routes.
• Every resolved block carries the same netname, USDOJ, and the same registrant, so the registry distinguishes none of them.
• The registrant spells the country abbreviation with spaces inside it, which is enough to defeat an exact-match search for the more common form.
• The IPv6 announcements form a ladder from a /37 down through successive lengths to two adjacent /48 blocks, with two further /48 prefixes from an unrelated part of the allocation.
• Eighteen addresses were queried for reverse DNS and none returned a name.

Interesting

• One observed neighbour for a department this size is the finding, and it is a statement about what the collectors see rather than about the network. Government traffic that transits a shared federal network reaches the public internet through it, so the department's own peering is invisible from outside.
• Splitting one range into thirty-four routes while publishing nothing in reverse DNS is a network organised entirely for its own purposes. The deaggregation shows internal structure exists; nothing in the record says what any piece of it is.

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

Announced prefixes

• 149.101.1.0/24
• 149.101.17.0/24
• 149.101.21.0/24
• 149.101.22.0/24
• 149.101.25.0/24
• 149.101.26.0/24
• 149.101.29.0/24
• 149.101.30.0/24
• 149.101.32.0/24
• 149.101.40.0/24
• 149.101.45.0/24
• 149.101.47.0/24
• 149.101.50.0/23
• 149.101.52.0/24
• 149.101.57.0/24
• 149.101.68.0/22
• 149.101.72.0/21
• 149.101.80.0/22
• 149.101.84.0/23
• 149.101.92.0/22
• 149.101.107.0/24
• 149.101.111.0/24
• 149.101.127.0/24
• 149.101.128.0/24
• 149.101.150.0/23
• 149.101.160.0/22
• 149.101.180.0/22
• 149.101.184.0/23
• 149.101.192.0/22
• 149.101.207.0/24
• 149.101.218.0/24
• 149.101.222.0/24
• 149.101.226.0/24
• 149.101.228.0/24
• 2607:f330:5000::/48
• 2607:f330:5fa1::/48
• 2607:f330:6000::/36
• 2607:f330:a001::/48
• 2607:f330:a002::/48

Upstream networks

• AS7018 AT&T Enterprises, LLC

Adjacent networks

• AS7018 AT&T Enterprises, LLC

Routing security

• RPKI: 41 valid, 0 invalid and 0 not-found announcements; 2 ROAs.
• ASPA: none published.
• IRR: 0% of announcements registered; 2 route objects.