Autonomous system
AS10309 MARIN-MIDAS
Unclassified ARIN
Summary
County of Marin (MIDAS)
government county public-sector consortium california
MARIN-MIDAS is the network of the County of Marin, California, run under the banner of MIDAS — Marin Information and Data Access Systems, a shared-infrastructure consortium of county, city, school and non-profit agencies across the county.
What it's used for
MIDAS provides internet connectivity at public buildings, access to law-enforcement, emergency-response and justice systems, and inter-agency data sharing. The county's Information Services and Technology department operates it on behalf of the member agencies, so the AS carries a public-sector user population rather than a commercial one.
Notable
This is government, and the shape of the routing is the argument. RIS observes 12 IPv4 prefixes carrying 9,472 addresses and only 3 BGP neighbours. Almost all of the space is one run — 199.88.64.0/21, 199.88.72.0/22, 199.88.80.0/21, 199.88.88.0/22 and a string of longer prefixes up through 199.88.120.0/23 — i.e. a single legacy block being deaggregated for internal traffic engineering, plus one outlier (107.0.46.0/23). A network that announces one estate and buys from three neighbours is consuming connectivity for its own sites, not selling it.
The consortium model also explains the deaggregation: distinct member agencies sit in distinct sub-blocks and get advertised separately so each can be steered independently.
Interesting
The MIDAS name is worth flagging because the handle looks like a vendor brand and is not one. It is a shared government network, so addresses inside it can legitimately belong to a city, a school district or a non-profit partner rather than to the county itself — geolocating this space to "Marin County offices" is the obvious over-read to avoid.
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 2026-10-15, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 9 prefixes · 8.19K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 9 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS10309- Registry name
- MARIN-MIDAS
- Registrant
- County of Marin
- Abuse contact
- jason.balderama@marincounty.gov
- Registered
- 1997-06-23
- Last changed
- 1997-06-23
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 8% valid · 1 valid, 11 with no ROA
- ROAs
- 1 authorising AS10309
- ASPA
- no ASPA record
- IRR
- 75% registered · 9 of 12 announcements 1 other origin
- Route objects
- 9 naming AS10309
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 1,782 prefixes, as published 2026-10-16. 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