ASN AS21633 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS21633?

AS21633 is listed under U.S. Department of the Interior.

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.

AS21633 U.S. Department of the Interior

ASN Lookup Tool

U.S. Department of the Interior ios.doi.gov

US 4 Routes

AS Data

AS21633

AS21633 – U.S. Department of the Interior

AS Number	21633
AS Name	DOI-NBC-NET
Organization	U.S. Department of the Interior(udi-1)
Country	US
Website	ios.doi.gov
Number of IPv4 Routes	4
Number of IPv6 Routes	0
ASN type	GOVERNMENT
Registry	ARIN
Date Allocated	2001-06-01

ASN Intelligence API for production workflows

Use ASN data for AS21633 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

Access complete peers, upstreams, downstreams, routes, WHOIS, and contact intelligence via our API. Learn more

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
137.227.192.0/21	AS21633	U.S. Department of the Interior	U.S. Department of the Interior	2048
137.227.96.0/21	AS21633	U.S. Department of the Interior	U.S. Department of the Interior	2048
205.173.4.0/24	AS21633	U.S. Department of the Interior	U.S. Department of the Interior	256
205.173.0.0/24	AS21633	U.S. Department of the Interior	U.S. Department of the Interior	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:       21633
ASName:         DOI-NBC-NET
ASHandle:       AS21633
RegDate:        2001-06-01
Updated:        2023-11-17    
Ref:            https://rdap.arin.net/registry/autnum/21633


OrgName:        U.S. Department of the Interior
OrgId:          UDI-1
Address:        1849 C St., N.W.
City:           Washington
StateProv:      DC
PostalCode:     20240
Country:        US
RegDate:        1993-09-07
Updated:        2025-01-28
Ref:            https://rdap.arin.net/registry/entity/UDI-1


OrgTechHandle: AYS-ARIN
OrgTechName:   Shaw, Amy Y
OrgTechPhone:  +1-703-622-6097 
OrgTechEmail:  amy_y_shaw@ios.doi.gov
OrgTechRef:    https://rdap.arin.net/registry/entity/AYS-ARIN

OrgDNSHandle: STEVE25-ARIN
OrgDNSName:   Harrington, Steven A
OrgDNSPhone:  +1-303-564-8342 
OrgDNSEmail:  steven_harrington@ios.doi.gov
OrgDNSRef:    https://rdap.arin.net/registry/entity/STEVE25-ARIN

OrgTechHandle: PICKE159-ARIN
OrgTechName:   Pickett, Ronald 
OrgTechPhone:  +1-303-969-7456 
OrgTechEmail:  ron_l_pickett@ios.doi.gov
OrgTechRef:    https://rdap.arin.net/registry/entity/PICKE159-ARIN

OrgTechHandle: STEVE25-ARIN
OrgTechName:   Harrington, Steven A
OrgTechPhone:  +1-303-564-8342 
OrgTechEmail:  steven_harrington@ios.doi.gov
OrgTechRef:    https://rdap.arin.net/registry/entity/STEVE25-ARIN

OrgAbuseHandle: AYS-ARIN
OrgAbuseName:   Shaw, Amy Y
OrgAbusePhone:  +1-703-622-6097 
OrgAbuseEmail:  amy_y_shaw@ios.doi.gov
OrgAbuseRef:    https://rdap.arin.net/registry/entity/AYS-ARIN

OrgAbuseHandle: STEVE25-ARIN
OrgAbuseName:   Harrington, Steven A
OrgAbusePhone:  +1-303-564-8342 
OrgAbuseEmail:  steven_harrington@ios.doi.gov
OrgAbuseRef:    https://rdap.arin.net/registry/entity/STEVE25-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
AS3549	Level 3 Communications, Inc. (GBLX)	US
AS3549	Level 3 Parent, LLC	US
AS22284	U.S. Department of the Interior	US

Upstreams

AS Number	Description	Country
AS3549	Level 3 Parent, LLC	US
AS22284	U.S. Department of the Interior	US