Autonomous system
AS19739 COUNTY-SANBERNARDINO
Unclassified ARIN
Summary
County of San Bernardino
government municipal network usa
COUNTY-SANBERNARDINO is the autonomous system for the County of San Bernardino.
What it's used for
- The address space carries internal county network infrastructure, identified by the consistent netname
SANBDNOacross all registered prefixes. - The AS announces 10,240 IPv4 addresses across 21 prefixes with only 3 observed neighbours, indicating a self-contained internal network rather than a transit or access provider.
Notable
- All registrants in the RDAP data are listed as "San Bernardino County," which aligns directly with the AS holder name.
- The address inventory is finely subdivided into 21 distinct prefixes, ranging from a /21 down to multiple /24s, suggesting site-by-site segmentation for different county facilities or departments.
- No IPv6 prefixes are currently announced in the inventory.
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 2026-10-28, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 21 prefixes · 10.50K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 21 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS19739- Registry name
- COUNTY-SANBERNARDINO
- Registrant
- County of San Bernardino
- Abuse contact
- david.robbins@itd.sbcounty.gov
- Registered
- 2001-02-08
- Last changed
- 2021-08-19
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 27 with no ROA
- ROAs
- 0 authorising AS19739
- ASPA
- no ASPA record
- IRR
- 100% registered · 27 of 27 announcements
- Route objects
- 4 naming AS19739
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: 448 networks and 1,849 prefixes, as published 2026-10-29. 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