Autonomous system profile

Review registration details, announced prefixes, network relationships and historical snapshots.

AS39961

Announcement observedARIN

San Francisco Department of Telecommunications and Information Services · CCSF

This profile is assembled from CHA.LA's normalized registration, routing and observation snapshots.

Last active10/3/2026, 07:56:11Snapshot expired

View network topology RDAP registration

ASN: AS39961
Registration country: United States
Name: San Francisco Department of Telecommunications and Information Services
Abbreviation: CCSF
Registration date: 5/24/2006, 17:46:37
Status: Announcement observed
RIR: ARIN

Network relationships and announced prefixes

ASN / prefix	Description / organization	Geographic scope	First seen	Last active	IPv4	IPv6	Status
208.121.0.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/19/2026, 00:00:00	10/3/2026, 00:00:00	✓	×	Historical record
208.121.1.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/19/2026, 00:00:00	10/3/2026, 00:00:00	✓	×	Historical record
208.121.128.0/17BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/19/2026, 00:00:00	10/3/2026, 00:00:00	✓	×	Historical record
208.121.203.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/19/2026, 00:00:00	10/3/2026, 00:00:00	✓	×	Historical record
208.121.224.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/19/2026, 00:00:00	10/3/2026, 00:00:00	✓	×	Historical record
208.121.225.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/19/2026, 00:00:00	10/3/2026, 00:00:00	✓	×	Historical record
208.121.226.0/23BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/19/2026, 00:00:00	10/3/2026, 00:00:00	✓	×	Historical record
208.121.230.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/25/2026, 00:00:00	10/3/2026, 00:00:00	✓	×	Historical record
208.121.32.0/20BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/19/2026, 00:00:00	10/3/2026, 00:00:00	✓	×	Historical record
208.121.48.0/20BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/19/2026, 00:00:00	10/3/2026, 00:00:00	✓	×	Historical record
208.121.5.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/19/2026, 00:00:00	10/3/2026, 00:00:00	✓	×	Historical record
208.121.6.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/19/2026, 00:00:00	10/3/2026, 00:00:00	✓	×	Historical record
208.121.64.0/18BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/19/2026, 00:00:00	10/3/2026, 00:00:00	✓	×	Historical record

BGP prefixes have no geographic country; the column is marked not applicable.

Registration and sources

Organization: San Francisco Department of Telecommunications and Information Services
RIR: ARIN
Registration country: United States
Registration date: 5/24/2006, 17:46:37
Abuse contact: cyberdefense@sfgov.org

Snapshot trend

10/3/2026, 07:56:1113 v40 v63 Upstream · 0 Uncertain

ASN route snapshotThis page reads collected ASN, prefix, relationship and history data. External interfaces are used for initial collection and scheduled refreshes.Source keys: cha-la-external-routing · iana-rdap-asn-bootstrap · rir-rdap-asn