Autonomous system
AS39961 CCSF - San Francisco Department of Telecommunications and Information Services
Unclassified ARIN Government
Summary
San Francisco Department of Telecommunications and Information Services
government municipal it network
CCSF is the autonomous system for the San Francisco Department of Telecommunications and Information Services.
What it's used for
- The address space carries municipal government infrastructure, evidenced by reverse DNS entries such as
sf208-121-80-0.sfgov.organd netnames consistently labeledCCSF. - The AS announces 58,368 IPv4 addresses across 14 prefixes with only 2 observed neighbours, indicating a self-contained internal network rather than a transit or access provider.
- Traffic from this AS consists of internal city government data, administrative services, and IT infrastructure managed by the Department of Telecommunications and Information Services.
Notable
- All registrants in the evidence pack align with the announcer, identifying the San Francisco Department of Telecommunications and Information Services as the sole holder.
- The inventory is a finely subdivided corporate estate within the 208.121.0.0/16 range, segmented into various /18, /19, /20, /21, /22, /23, and /24 blocks.
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
Recorded at 1 exchange in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| San Francisco Metropolitan Internet Exchange | San Francisco, United States | 206.197.187.114 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-05, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 16 prefixes · 58.37K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 16 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS39961- Registry name
- CCSF
- Registrant
- San Francisco Department of Telecommunications and Information Services
- Abuse contact
- cyberdefense@sfgov.org
- Registered
- 2006-05-24
- Last changed
- 2012-03-02
- Allocation
- assigned
Declared
PeeringDB profile
- Name
- CCSF
- Network type
- Government
- Scope
- Regional
- Traffic ratio
- Balanced
- Peering policy
- Open
- Website
- https://sf.gov
PeeringDB records are maintained by the network operator and are not independently verified. Treat them as a statement of intent rather than of fact. For the observed and recorded view, see peering, which lists the exchanges Packet Clearing House has a port on file for.
Routing security
RPKI and IRR
- RPKI
- 100% valid · 13 valid, 0 with no ROA
- ROAs
- 2 authorising AS39961
- ASPA
- 4 declared providers
- IRR
- 100% registered · 13 of 13 announcements
- Route objects
- 2 naming AS39961
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: 453 networks and 1,854 prefixes, as published 2026-11-06. 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