Autonomous system
AS13968 CAISO-NET-BLK
Unclassified ARIN
Summary
California ISO
infrastructure government enterprise
The organisation that balances a state's electricity grid, announcing six small blocks behind one upstream.
What it's used for
- A grid operator's network. 2,048 addresses across six IPv4 prefixes, one observed BGP neighbour, and no IPv6 announced.
Notable
- Three blocks are netname
CALIFO-22, registered toCALIFORNIA ISO. - Three more are
ATT-NET-12-200-57-0,ATT-NET-12-200-60-0andATT-NET-12-231-58-0, also registered to the operator. - The blocks split between an older carrier range and a range only recently in circulation.
- Eighteen addresses were queried for reverse DNS and none returned a name.
Interesting
- An independent system operator matches electricity supply to demand across a whole state, second by second. Its network is one of the least public and most consequential on this list, and from the outside it looks like any other company with a couple of thousand addresses.
- One upstream is the detail worth pausing on. Control systems of this kind do not run over the public internet, so what is announced here is the small outward-facing edge and the real resilience lives on circuits that never appear in a routing table.
- The netname truncates the organisation to six characters and appends a counter, which is the registry's old fixed-width habit surviving into records that had no need of 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.
Transit providers
1 upstream, 0 downstream and 1 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS55002 | F5, Inc. | 580 |
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 6 prefixes · 2.56K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 6 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS13968- Registry name
- CAISO-NET-BLK
- Registrant
- CALIFORNIA ISO
- Abuse contact
- ylim@caiso.com
- Registered
- 1999-09-24
- Last changed
- 2023-07-11
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 10 with no ROA
- ROAs
- 0 authorising AS13968
- ASPA
- no ASPA record
- IRR
- 100% registered · 10 of 10 announcements
- Route objects
- 5 naming AS13968
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 1,781 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