AS39961 — CCSF

AS39961 announces 6 IPv4 prefixes covering 58,368 addresses and 0 IPv6 prefixes.

About this 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.org and netnames consistently labeled CCSF.
• 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.

Announced prefixes

• 208.121.0.0/23
• 208.121.5.0/24
• 208.121.6.0/24
• 208.121.32.0/19
• 208.121.64.0/18
• 208.121.128.0/17

Upstream networks

• AS11404 Wave Broadband
• AS7018 AT&T Enterprises, LLC
• AS6939 Hurricane Electric LLC

Downstream networks

• AS64866

Adjacent networks

• AS11404 Wave Broadband
• AS7018 AT&T Enterprises, LLC
• AS6939 Hurricane Electric LLC
• AS64866