ASN AS39961 is an Autonomous System Number used to identify a network for BGP internet routing.

What do peers, upstreams, and downstreams mean in ASN data?

Peers are lateral network interconnections, upstreams are transit providers, and downstreams are customer networks receiving connectivity.

What are routes and IP ranges for an ASN?

Routes and IP ranges are the network prefixes announced by the ASN on the internet and show the address space it originates.

Why is WHOIS data shown for an ASN?

WHOIS data provides registration and contact context for ASN ownership, administration, and operational reference.

How can I access the full ASN tables?

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AS39961 San Francisco Department of Telecommunications and Information Services

Q: Who manages ASN AS39961?

AS39961 is listed under San Francisco Department of Telecommunications and Information Services.

ASN Lookup Tool

San Francisco Department of Telecommunications and Information Services sf.gov

US 12 Routes

AS Data

AS39961

AS39961 – San Francisco Department of Telecommunications and Information Services

AS Number	39961
AS Name	CCSF
Organization	San Francisco Department of Telecommunications and Information Services(sfdtis)
Country	US
Website	sf.gov
Number of IPv4 Routes	12
Number of IPv6 Routes	0
ASN type	GOVERNMENT
Registry	ARIN
Date Allocated	2006-05-24

ASN Intelligence API for production workflows

Use ASN data for AS39961 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
208.121.32.0/20	AS39961	San Francisco Department of Telecommunications and Information Services	San Francisco Department of Telecommunications and Information Services	4096
208.121.226.0/23	AS39961	San Francisco Department of Telecommunications and Information Services	San Francisco Department of Telecommunications and Information Services	512
208.121.203.0/24	AS39961	San Francisco Department of Telecommunications and Information Services	San Francisco Department of Telecommunications and Information Services	256
208.121.48.0/20	AS39961	San Francisco Department of Telecommunications and Information Services	San Francisco Department of Telecommunications and Information Services	4096
208.121.64.0/18	AS39961	San Francisco Department of Telecommunications and Information Services	San Francisco Department of Telecommunications and Information Services	16384
208.121.1.0/24	AS39961	San Francisco Department of Telecommunications and Information Services	San Francisco Department of Telecommunications and Information Services	256
208.121.6.0/24	AS39961	San Francisco Department of Telecommunications and Information Services	San Francisco Department of Telecommunications and Information Services	256
208.121.0.0/24	AS39961	San Francisco Department of Telecommunications and Information Services	San Francisco Department of Telecommunications and Information Services	256
208.121.5.0/24	AS39961	San Francisco Department of Telecommunications and Information Services	San Francisco Department of Telecommunications and Information Services	256
208.121.128.0/17	AS39961	San Francisco Department of Telecommunications and Information Services	San Francisco Department of Telecommunications and Information Services	32768

Raw Whois Response

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#


ASNumber:       39961
ASName:         CCSF
ASHandle:       AS39961
RegDate:        2006-05-24
Updated:        2012-03-02    
Ref:            https://rdap.arin.net/registry/autnum/39961


OrgName:        San Francisco Department of Telecommunications and Information Services
OrgId:          SFDTIS
Address:        One South Van Ness Avenue
Address:        2nd Floor
City:           San Francisco
StateProv:      CA
PostalCode:     94103
Country:        US
RegDate:        2005-06-14
Updated:        2024-11-05
Comment:        Contact dt.ops@sfgov.org, 1-628-652-5100
Ref:            https://rdap.arin.net/registry/entity/SFDTIS


OrgNOCHandle: NOC3189-ARIN
OrgNOCName:   Network Operations Center
OrgNOCPhone:  +1-415-581-7170 
OrgNOCEmail:  dt.ops@sfgov.org
OrgNOCRef:    https://rdap.arin.net/registry/entity/NOC3189-ARIN

OrgTechHandle: BELLB45-ARIN
OrgTechName:   Bell, Bradley 
OrgTechPhone:  +1-949-216-0013 
OrgTechEmail:  brad.bell@sfgov.org
OrgTechRef:    https://rdap.arin.net/registry/entity/BELLB45-ARIN

OrgAbuseHandle: DTSEC-ARIN
OrgAbuseName:   DT Security
OrgAbusePhone:  +1-628-652-5000 
OrgAbuseEmail:  cyberdefense@sfgov.org
OrgAbuseRef:    https://rdap.arin.net/registry/entity/DTSEC-ARIN

OrgTechHandle: GRY9-ARIN
OrgTechName:   Ybanez, Glacier R
OrgTechPhone:  +1-415-716-8419 
OrgTechEmail:  glacier.ybanez@sf.gov
OrgTechRef:    https://rdap.arin.net/registry/entity/GRY9-ARIN


#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#

Parsed Whois Response

Peers

AS Number	Description	Country
AS7018	AT&T Enterprises, LLC	US
AS11404	Wave Broadband	US

Upstreams

AS Number	Description	Country
AS7018	AT&T Enterprises, LLC	US
AS11404	Wave Broadband	US