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AS4241 California State Franchise Tax Board

Q: Why is WHOIS data shown for an ASN?

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

ASN Lookup Tool

California State Franchise Tax Board ftb.ca.gov

US 1 Routes

AS Data

AS4241

AS4241 – California State Franchise Tax Board

AS Number	4241
AS Name	CSFTB
Organization	California State Franchise Tax Board(csftb-z)
Country	US
Website	ftb.ca.gov
Number of IPv4 Routes	1
Number of IPv6 Routes	0
ASN type	GOVERNMENT
Registry	ARIN
Date Allocated	1995-01-11

ASN Intelligence API for production workflows

Use ASN data for AS4241 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
168.240.0.0/16	AS4241	California State Franchise Tax Board	California State Franchise Tax Board	65536

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:       4241
ASName:         CSFTB
ASHandle:       AS4241
RegDate:        1995-01-11
Updated:        2024-11-15    
Ref:            https://rdap.arin.net/registry/autnum/4241


OrgName:        California State Franchise Tax Board
OrgId:          CSFTB-Z
Address:        9646 Butterfield Way
City:           Sacramento
StateProv:      CA
PostalCode:     95827
Country:        US
RegDate:        2024-10-31
Updated:        2024-10-31
Ref:            https://rdap.arin.net/registry/entity/CSFTB-Z


OrgTechHandle: STRIN95-ARIN
OrgTechName:   Stringer, Chris 
OrgTechPhone:  +1-916-845-3893 
OrgTechEmail:  christopher.stringer@ftb.ca.gov
OrgTechRef:    https://rdap.arin.net/registry/entity/STRIN95-ARIN

OrgTechHandle: PERKI391-ARIN
OrgTechName:   Perkins, Josh 
OrgTechPhone:  +1-916-845-3918 
OrgTechEmail:  Josh.Perkins@ftb.ca.gov
OrgTechRef:    https://rdap.arin.net/registry/entity/PERKI391-ARIN

OrgAbuseHandle: PERKI391-ARIN
OrgAbuseName:   Perkins, Josh 
OrgAbusePhone:  +1-916-845-3918 
OrgAbuseEmail:  Josh.Perkins@ftb.ca.gov
OrgAbuseRef:    https://rdap.arin.net/registry/entity/PERKI391-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
AS6461	Zayo Bandwidth	US

Upstreams

AS Number	Description	Country
AS6461	Zayo Bandwidth	US

Frequently Asked Questions

What is ASN AS4241?

ASN AS4241 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS4241?

AS4241 is listed under California State Franchise Tax Board.

What do peers, upstreams, and downstreams mean?

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 included here?

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

How can I access full ASN table data?

This page previews large ASN datasets. Use See more to load additional rows, and upgrade your plan to view complete peer, route, upstream, and downstream data.