Autonomous system
AS11901 COSWAN - County of Sacramento
Unclassified ARIN
Summary
County of Sacramento
government legacy
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.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-31, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 1 prefixes · 1.02K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 1 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS11901- Registry name
- COSWAN
- Registrant
- County of Sacramento
- Abuse contact
- cosdns@saccounty.net
- Registered
- 2007-05-29
- Last changed
- 2012-03-02
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 2 with no ROA
- ROAs
- 0 authorising AS11901
- ASPA
- no ASPA record
- IRR
- 100% registered · 2 of 2 announcements
- Route objects
- 10 naming AS11901
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 447 networks and 1,843 prefixes, as published 2026-11-01. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere