ASN AS33239 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS33239?

AS33239 is listed under Center for Internet Security.

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?

The page shows a preview of large ASN datasets. Use the page controls to load more rows, and upgrade to a paid plan for complete access.

AS33239 Center for Internet Security

ASN Lookup Tool

Center for Internet Security cisecurity.org

US 2 Routes

AS Data

AS33239

AS33239 – Center for Internet Security

AS Number	33239
AS Name	CIS-MSISAC
Organization	Center for Internet Security(cis-356)
Country	US
Website	cisecurity.org
Number of IPv4 Routes	2
Number of IPv6 Routes	0
ASN type	GOVERNMENT
Registry	ARIN
Date Allocated	2011-03-17

ASN Intelligence API for production workflows

Use ASN data for AS33239 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
69.195.43.0/24	AS33239	Center for Internet Security	Fibertech Networks	256
192.58.118.0/24	AS33239	Center for Internet Security	Center for Internet Security	256

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:       33239
ASName:         CIS-MSISAC
ASHandle:       AS33239
RegDate:        2011-03-17
Updated:        2012-03-02    
Ref:            https://rdap.arin.net/registry/autnum/33239


OrgName:        Center for Internet Security
OrgId:          CIS-356
Address:        31 Tech Valley Drive
Address:        Suite 2
City:           East Greenbush
StateProv:      NY
PostalCode:     12061
Country:        US
RegDate:        2011-03-14
Updated:        2024-07-30
Comment:        http://www.cisecurity.org
Ref:            https://rdap.arin.net/registry/entity/CIS-356


OrgTechHandle: KOWAL96-ARIN
OrgTechName:   Kowalcyzk, Joe 
OrgTechPhone:  +1-518-516-3039 
OrgTechEmail:  Joe.kowalcyzk@cisecurity.org
OrgTechRef:    https://rdap.arin.net/registry/entity/KOWAL96-ARIN

OrgTechHandle: RAKOS4-ARIN
OrgTechName:   Rakoske, Jordan 
OrgTechPhone:  +1-518-516-6150 
OrgTechEmail:  Jordan.rakoske@cisecurity.org
OrgTechRef:    https://rdap.arin.net/registry/entity/RAKOS4-ARIN

OrgTechHandle: MARCO89-ARIN
OrgTechName:   Marcotullio, Angelo 
OrgTechPhone:  +1-518-880-0715 
OrgTechEmail:  it.dl@cisecurity.org
OrgTechRef:    https://rdap.arin.net/registry/entity/MARCO89-ARIN

OrgNOCHandle: MARCO89-ARIN
OrgNOCName:   Marcotullio, Angelo 
OrgNOCPhone:  +1-518-880-0715 
OrgNOCEmail:  it.dl@cisecurity.org
OrgNOCRef:    https://rdap.arin.net/registry/entity/MARCO89-ARIN

OrgTechHandle: LEHNI4-ARIN
OrgTechName:   Lehnig, Zofia 
OrgTechPhone:  +1-518-516-6113 
OrgTechEmail:  Zofia.lehnig@cisecurity.org
OrgTechRef:    https://rdap.arin.net/registry/entity/LEHNI4-ARIN

OrgAbuseHandle: MARCO89-ARIN
OrgAbuseName:   Marcotullio, Angelo 
OrgAbusePhone:  +1-518-880-0715 
OrgAbuseEmail:  it.dl@cisecurity.org
OrgAbuseRef:    https://rdap.arin.net/registry/entity/MARCO89-ARIN

RNOCHandle: STEGM-ARIN
RNOCName:   Stegmann, Rick 
RNOCPhone:  +1-518-266-3460 
RNOCEmail:  rick.stegmann@cisecurity.org
RNOCRef:    https://rdap.arin.net/registry/entity/STEGM-ARIN

RAbuseHandle: STEGM-ARIN
RAbuseName:   Stegmann, Rick 
RAbusePhone:  +1-518-266-3460 
RAbuseEmail:  rick.stegmann@cisecurity.org
RAbuseRef:    https://rdap.arin.net/registry/entity/STEGM-ARIN

RTechHandle: STEGM-ARIN
RTechName:   Stegmann, Rick 
RTechPhone:  +1-518-266-3460 
RTechEmail:  rick.stegmann@cisecurity.org
RTechRef:    https://rdap.arin.net/registry/entity/STEGM-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
AS46887	Crown Castle Fiber LLC	US
AS11351	Charter Communications Inc	US

Upstreams

AS Number	Description	Country
AS46887	Crown Castle Fiber LLC	US
AS11351	Charter Communications Inc	US