Autonomous system
AS11188 LACOUNTY-ISD
Unclassified ARIN
Summary
Los Angeles County - Internal Services Department
government legacy
LACOUNTY-ISD is the Internal Services Department of the County of Los Angeles — the county's central IT and telecom organisation. It runs the shared network that the county's departments sit behind.
What it's used for
County government networking at genuine scale. RIS observes 49 IPv4 prefixes and roughly 132,352 addresses, anchored on two /16s: 159.83.0.0/16 and 170.208.0.0/16. There is no IPv6 in the observed routing. Only five BGP neighbours are seen, which is the shape of a large end-user network buying transit, not a carrier — the address count is big, the peering is not.
The registrant data confirms the AS is announcing its own county space rather than anyone else's: the two /16s are registered to LANET and LANET-1, and the long tail of /24s deaggregated out of them carries the same handles. One block, 159.225.155.0/24, is registered separately to LADHS-GOV — Los Angeles County's Department of Health Services, an agency inside the same county, which is exactly what you would expect a shared county AS to carry.
Notable
Los Angeles County is the largest county in the United States by population, and the address footprint reflects that: sheriff, health services, courts-adjacent systems, public works and dozens of other departments are all customers of this one network organisation.
Interesting
Almost the whole prefix list is /24s carved out of the two supernets and announced alongside them. That deaggregation is typical of a network stitching many departmental sites together over multiple upstream circuits.
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 73 prefixes · 132K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 73 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS11188- Registry name
- LACOUNTY-ISD
- Registrant
- LOS ANGELES COUNTY - INTERNAL SERVICESDIVISION
- Abuse contact
- EXD-ISDBreachNotification@isd.lacounty.gov
- Registered
- 1998-05-12
- Last changed
- 2016-11-01
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 49 with no ROA
- ROAs
- 0 authorising AS11188
- ASPA
- no ASPA record
- IRR
- 100% registered · 49 of 49 announcements
- Route objects
- 7 naming AS11188
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