AS13611 — CDC

AS13611 announces 2 IPv4 prefixes covering 73,728 addresses and 0 IPv6 prefixes.

About this network

A public health agency announcing a whole /16 and a /19 through exactly one upstream.

What it's used for

• A federal public health agency's network. 73,728 addresses across two IPv4 prefixes, 158.111.0.0/16 and 198.246.96.0/19, one observed BGP neighbour, and no IPv6 announced.

Notable

• The /19 is netname CDC3, the agency's initials with a counter.
• The /16's registry lookup failed, so nothing is known about its registration here.
• The AS handle is the bare initials, with nothing appended.
• Six addresses were queried for reverse DNS and none returned a name.

Interesting

• Announcing a /16 whole, with no subdivision at all, is the opposite of what most organisations this size do. Two routes for 73,728 addresses is the smallest possible footprint in everyone else's routing table, and it means nothing inside is being steered separately.
• One upstream for an agency whose data the country depends on looks fragile until you remember how federal networks are built. The redundancy lives inside the government's own transit arrangements, below the level a public routing table can see.
• A counter reaching three means two earlier objects exist under the same initials, so the agency's address space was registered in at least three separate rounds.

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

Announced prefixes

• 158.111.0.0/16
• 198.246.96.0/19

Upstream networks

• AS19050 U.S. Department of Health & Human Services

Adjacent networks

• AS19050 U.S. Department of Health & Human Services