AS11684 JCDH

JCDH is the Jefferson County Department of Health, the county public-health agency for Birmingham, Alabama. ARIN registers the ASN to 1400 6th Avenue South in Birmingham — the department's own address — and the ASN record itself dates from July 2023, so the low number is a recycled one and carries no early-internet history.

What it's used for

A single public-sector organisation's network. The AS announces one v4 prefix, 205.142.248.0/22 (1,024 addresses), and nothing in IPv6, with two observed neighbours. Two upstreams and one block is the ordinary shape of an institution that wants its own address space to survive a carrier outage: enough BGP to be independent of any single provider, no more. The peer count rules out any provider role — a network selling transit or access would show many more adjacencies.

Notable

The /22 is registered in ARIN directly to the Jefferson County Department of Health under the matching JCDH handle. Holder, registrant and the postal address on the record are the same county agency, so there is no gap between who owns the space and who announces it, and none of the third-party-registrant pattern that marks leased or brokered address blocks.

Interesting

County-level health departments rarely hold their own AS numbers — most sit inside a county or state government network. Running its own ASN and its own space means this agency's clinical and public-facing systems are addressed independently of the wider county IT footprint.