asn.dev

Autonomous system

AS22139 MARIN-COUNTY-01

Unclassified ARIN

IPv4 addresses 1.28K 3 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 1 0 downstream
Flagged prefixes 0 none

Summary

County of Marin

United States of America · AI-generated

government municipal network

The AS handle MARIN-COUNTY-01 is held by County of Marin.

What it's used for

  • The address space carries internal government infrastructure, evidenced by the netname MARIN-COUNTY and registrant County of Marin across all announced prefixes.
  • The AS announces 1280 IPv4 addresses across 3 prefixes with only 1 observed neighbour, indicating a small, self-contained municipal network rather than a transit or access provider.

Notable

  • All registrants align with the announcer, consistently identified as County of Marin for the prefixes 199.88.76.0/23, 199.88.114.0/23, and 199.88.79.0/24.
  • The inventory consists of three distinct IPv4 blocks in the 199.88.0.0/16 range, with no IPv6 prefixes announced.

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

Full topology · Graph

Internet exchanges

No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.

Transit providers

1 upstream, 0 downstream and 1 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS46375Sonic Telecom LLC111

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-14, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.

Address space

Summary

Shape and geography

IPv4 3 prefixes · 1.28K addresses IPv6 0 prefixes

CountryNamePrefixes
USUnited States of America3

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS22139
Registry name
MARIN-COUNTY-01
Registrant
County of Marin
Abuse contact
hostmaster@marincounty.gov
Registered
2023-08-10
Last changed
2023-08-10
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 3 with no ROA
ROAs
0 authorising AS22139
ASPA
no ASPA record
IRR
100% registered · 3 of 3 announcements
Route objects
6 naming AS22139

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: 442 networks and 1,773 prefixes, as published 2026-10-13. 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

Cross-check