ASN AS21511 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS21511?

AS21511 is listed under NCSBN, Inc..

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.

AS21511 NCSBN, Inc. | IPGeolocation.io

ASN Lookup Tool

NCSBN, Inc. ncsbn.org

US 1 Routes

AS Data

AS21511

AS21511 – NCSBN, Inc.

AS Number	21511
AS Name	NCSBN
Organization	NCSBN, Inc.(ncsbni)
Country	US
Website	ncsbn.org
Number of IPv4 Routes	1
Number of IPv6 Routes	0
ASN type	BUSINESS
Registry	ARIN
Date Allocated	2001-05-14

ASN Intelligence API for production workflows

Use ASN data for AS21511 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
65.248.198.0/24	AS21511	NCSBN, Inc.	NATIONAL COUNCIL OF STATE BOARDS OF NURSING INC	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:       21511
ASName:         NCSBN
ASHandle:       AS21511
RegDate:        2001-05-14
Updated:        2013-07-12    
Ref:            https://rdap.arin.net/registry/autnum/21511


OrgName:        NCSBN, Inc.
OrgId:          NCSBNI
Address:        111 East Wacker Drive
Address:        Suite 2900
City:           Chicago
StateProv:      IL
PostalCode:     60601
Country:        US
RegDate:        2001-05-14
Updated:        2013-07-12
Ref:            https://rdap.arin.net/registry/entity/NCSBNI


OrgNOCHandle: NETWO5023-ARIN
OrgNOCName:   Network Admins
OrgNOCPhone:  +1-312-525-3600 
OrgNOCEmail:  netadmin@ncsbn.org
OrgNOCRef:    https://rdap.arin.net/registry/entity/NETWO5023-ARIN

OrgAbuseHandle: NETWO5023-ARIN
OrgAbuseName:   Network Admins
OrgAbusePhone:  +1-312-525-3600 
OrgAbuseEmail:  netadmin@ncsbn.org
OrgAbuseRef:    https://rdap.arin.net/registry/entity/NETWO5023-ARIN

OrgTechHandle: NETWO5023-ARIN
OrgTechName:   Network Admins
OrgTechPhone:  +1-312-525-3600 
OrgTechEmail:  netadmin@ncsbn.org
OrgTechRef:    https://rdap.arin.net/registry/entity/NETWO5023-ARIN

RAbuseHandle: NETWO5023-ARIN
RAbuseName:   Network Admins
RAbusePhone:  +1-312-525-3600 
RAbuseEmail:  netadmin@ncsbn.org
RAbuseRef:    https://rdap.arin.net/registry/entity/NETWO5023-ARIN

RTechHandle: NETWO5023-ARIN
RTechName:   Network Admins
RTechPhone:  +1-312-525-3600 
RTechEmail:  netadmin@ncsbn.org
RTechRef:    https://rdap.arin.net/registry/entity/NETWO5023-ARIN

RNOCHandle: NETWO5023-ARIN
RNOCName:   Network Admins
RNOCPhone:  +1-312-525-3600 
RNOCEmail:  netadmin@ncsbn.org
RNOCRef:    https://rdap.arin.net/registry/entity/NETWO5023-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
AS701	Verizon Business/UUnet	US
AS174	Cogent Communications, LLC	US
AS701	Verizon Business	US

Upstreams

AS Number	Description	Country
AS7018	AT&T Enterprises, LLC	US
AS174	Cogent Communications, LLC	US
AS701	Verizon Business	US