AS11901 COSWAN

COSWAN is the County of Sacramento's wide-area network in California — a local-government AS, not a service provider. ARIN registers it to the county at 799 G Street, Sacramento, the address of the county's technology department, with the ASN assigned in 2007.

What it's used for

RIS shows a deliberately small footprint: 2 IPv4 prefixes, 1,024 addresses in total (208.79.244.0/23 and 208.79.246.0/23), no IPv6, and 4 observed neighbours. Both blocks are registered to the County of Sacramento itself under the COS-INET-01 handle, so origin and registrant match exactly — there is no leased or third-party space here.

That combination — a kilo-address inventory reached through a small handful of upstreams — is what a public-sector enterprise network looks like. The AS exists so the county can multi-home its own internet edge rather than depend on a single carrier: public-facing county services, the perimeter through which departmental staff reach the internet, and the county's own published resources. It carries the county's traffic and nobody else's. There are no eyeball access pools, no customer reassignments, and no sign of hosting on behalf of third parties.

Notable

The handle is a reminder that a name meaning nothing outside the organisation is normal in this range: COSWAN expands to County of Sacramento Wide Area Network, an internal label that reveals its owner only once you read the registry address behind it.