ASN AS721 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS721?

AS721 is listed under United States Department of Defense.

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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AS721 United States Department of Defense

United States Department of Defense defense.gov

US 234 Routes

AS Data

AS721

AS721 – United States Department of Defense

AS Number	721
AS Name	DNIC-ASBLK-00721-00726
Organization	United States Department of Defense (usddd)
Country	US
Website	defense.gov
Number of IPv4 Routes	232
Number of IPv6 Routes	2
ASN type	GOVERNMENT
Registry	ARIN
Date Allocated	N/A

ASN Intelligence API for production workflows

Use ASN data for AS721 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
143.76.0.0/16	AS721	United States Department of Defense DoD	U.S. Army Information Systems Command	65536
131.64.0.0/13	AS27064	United States Department of Defense DoD	DoD Network Information Center	524288
144.170.0.0/16	AS721	United States Department of Defense DoD	U.S. Army Information Systems Command	65536
199.252.180.0/24	AS721	United States Department of Defense DoD	United States Department of Defense	256
199.252.128.0/18	AS721	United States Department of Defense DoD	United States Department of Defense	16384
192.108.176.0/21	AS721	United States Department of Defense DoD	U.S. Army Information Systems Command	2048
141.234.0.0/15	AS138	United States Department of Defense DoD	DoD Network Information Center	131072
143.85.0.0/18	AS721	United States Department of Defense DoD	U.S. Army Information Systems Command	16384
206.37.0.0/16	AS1540	Headquarters, USAISC	DoD Network Information Center	65536
192.129.64.0/22	AS721	United States Department of Defense DoD	U.S. Army Information Systems Command	1024
199.114.32.0/20	AS721	United States Department of Defense DoD	U.S. Army Information Systems Command	4096
205.56.162.0/24	AS721	United States Department of Defense DoD	United States Department of Defense	256
134.135.0.0/16	AS721	United States Department of Defense DoD	DoD Network Information Center	65536
155.152.0.0/14	AS1540	Headquarters, USAISC	U.S. Army Information Systems Command	262144
164.236.0.0/16	AS721	United States Department of Defense DoD	DoD Network Information Center	65536
131.16.0.0/16	AS721	United States Department of Defense DoD	United States Air Force	65536
192.101.132.0/23	AS5972	United States Department of Defense DoD	DoD Network Information Center	512
159.77.0.0/16	AS721	United States Department of Defense DoD	DoD Network Information Center	65536
192.187.4.0/22	AS5860	United States Department of Defense DoD	Navy Network Information Center (NNIC)	1024
143.85.64.0/18	AS721	United States Department of Defense DoD	U.S. Army Information Systems Command	16384
144.182.0.0/15	AS721	United States Department of Defense DoD	DoD Network Information Center	131072
131.73.0.0/16	AS721	United States Department of Defense DoD	DoD Network Information Center	65536
192.156.0.0/18	AS721	United States Department of Defense DoD	MARINE CORPS CYBERSPACE OPERATIONS GROUP	16384
198.250.224.0/20	AS5972	United States Department of Defense DoD	DoD Network Information Center	4096
192.86.252.0/24	AS721	United States Department of Defense DoD	U.S. Army Information Systems Command	256
199.252.48.0/22	AS721	United States Department of Defense DoD	United States Department of Defense	1024
199.112.0.0/15	AS721	United States Department of Defense DoD	DoD Network Information Center	131072
199.208.0.0/16	AS5972	United States Department of Defense DoD	DoD Network Information Center	65536
138.178.0.0/16	AS721	United States Department of Defense DoD	Navy Network Information Center (NNIC)	65536
138.136.0.0/13	AS5972	United States Department of Defense DoD	DoD Network Information Center	524288
155.7.0.0/16	AS721	United States Department of Defense DoD	DoD Network Information Center	65536
199.252.162.0/24	AS721	United States Department of Defense DoD	United States Department of Defense	256
131.80.0.0/14	AS721	United States Department of Defense DoD	DoD Network Information Center	262144
144.104.0.0/15	AS721	United States Department of Defense DoD	U.S. Army Information Systems Command	131072
204.222.0.0/15	AS27064	United States Department of Defense DoD	DoD Network Information Center	131072
147.130.0.0/15	AS367	United States Department of Defense DoD	U.S. Army Information Systems Command	131072
198.154.8.0/21	AS56	United States Department of Defense DoD	United States Air Force	2048
153.24.0.0/15	AS6035	United States Department of Defense DoD	United States Air Force	131072
153.29.0.0/17	AS721	United States Department of Defense DoD	United States Air Force	32768
132.96.0.0/11	AS306	United States Department of Defense DoD	United States Department of Defense	2097152
160.132.0.0/15	AS1540	Headquarters, USAISC	U.S. Army Information Systems Command	131072
192.41.202.0/24	AS721	United States Department of Defense DoD	DoD Network Information Center	256
207.132.0.0/15	AS721	United States Department of Defense DoD	DoD Network Information Center	131072
134.233.0.0/16	AS721	United States Department of Defense DoD	U.S. Army Information Systems Command	65536
155.214.0.0/15	AS1540	Headquarters, USAISC	U.S. Army Information Systems Command	131072
131.78.204.0/24	AS721	United States Department of Defense DoD	DoD Network Information Center	256
153.26.0.0/16	AS721	United States Department of Defense DoD	United States Air Force	65536
192.73.28.0/23	AS367	United States Department of Defense DoD	U.S. Army Information Systems Command	512
199.252.157.0/24	AS721	United States Department of Defense DoD	United States Department of Defense	256
192.86.232.0/21	AS367	United States Department of Defense DoD	United States Department of Defense	2048
192.172.0.0/19	AS721	United States Department of Defense DoD	U.S. Army Information Systems Command	8192
139.244.2.0/24	AS721	United States Department of Defense DoD	DoD Network Information Center	256
155.21.192.0/19	AS721	United States Department of Defense DoD	U.S. Army Information Systems Command	8192
192.138.24.0/21	AS5972	United States Department of Defense DoD	United States Department of Defense	2048
131.86.0.0/15	AS27046	United States Department of Defense DoD	DoD Network Information Center	131072
199.252.32.0/20	AS721	United States Department of Defense DoD	United States Department of Defense	4096
160.126.0.0/15	AS1959	United States Department of Defense DoD	DoD Network Information Center	131072
192.153.136.0/21	AS721	United States Department of Defense DoD	U.S. Army Information Systems Command	2048
204.34.0.0/16	AS721	United States Department of Defense DoD	United States Department of Defense	65536
139.244.1.0/24	AS721	United States Department of Defense DoD	DoD Network Information Center	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:       721 - 726
ASName:         DNIC-ASBLK-00721-00726
ASHandle:       AS721
RegDate:        
Updated:        2025-09-12
Ref:            https://rdap.arin.net/registry/autnum/721



OrgName:        United States Department of Defense (DoD)
OrgId:          USDDD
Address:        3990 E. Broad Street
City:           Columbus
StateProv:      OH
PostalCode:     43218
Country:        US
RegDate:        2007-01-12
Updated:        2026-08-12
Ref:            https://rdap.arin.net/registry/entity/USDDD


OrgNOCHandle: MIL-HSTMST-ARIN
OrgNOCName:   Network DoD
OrgNOCPhone:  +1-844-347-2457 
OrgNOCEmail:  disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil
OrgNOCRef:    https://rdap.arin.net/registry/entity/MIL-HSTMST-ARIN

OrgTechHandle: MIL-HSTMST-ARIN
OrgTechName:   Network DoD
OrgTechPhone:  +1-844-347-2457 
OrgTechEmail:  disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil
OrgTechRef:    https://rdap.arin.net/registry/entity/MIL-HSTMST-ARIN

OrgTechHandle: REGIS10-ARIN
OrgTechName:   Registration
OrgTechPhone:  +1-844-347-2457 
OrgTechEmail:  disa.columbus.ns.mbx.arin-registrations@mail.mil
OrgTechRef:    https://rdap.arin.net/registry/entity/REGIS10-ARIN

OrgAbuseHandle: MIL-HSTMST-ARIN
OrgAbuseName:   Network DoD
OrgAbusePhone:  +1-844-347-2457 
OrgAbuseEmail:  disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil
OrgAbuseRef:    https://rdap.arin.net/registry/entity/MIL-HSTMST-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

{
  "status" : true,
  "whois_server" : "whois.arin.net",
  "aut_nums" : [ {
    "aut_num" : "721 - 726",
    "as_handle" : "AS721",
    "as_name" : "DNIC-ASBLK-00721-00726",
    "tech_contacts" : [ "MIL-HSTMST-ARIN", "REGIS10-ARIN" ],
    "abuse_contacts" : [ "MIL-HSTMST-ARIN" ],
    "date_updated" : "2025-09-12",
    "source" : "https://rdap.arin.net/registry/autnum/721"
  } ],
  "organization" : {
    "handle" : "USDDD",
    "name" : "United States Department of Defense (DoD)",
    "address" : [ "3990 E. Broad Street", "Columbus", "OH", "43218", "US" ],
    "street" : "E. Broad Street",
    "city" : "Columbus",
    "state" : "OH",
    "zip_code" : "43218",
    "country" : [ "US" ],
    "date_created" : "2007-01-12",
    "date_updated" : "2026-08-12",
    "source" : "https://rdap.arin.net/registry/entity/USDDD",
    "addressCountry" : "US"
  },
  "technical_contacts" : [ {
    "handle" : "MIL-HSTMST-ARIN",
    "name" : "Network DoD",
    "email" : [ "disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil" ],
    "phone" : [ "+1-844-347-2457" ],
    "source" : "https://rdap.arin.net/registry/entity/MIL-HSTMST-ARIN"
  }, {
    "handle" : "REGIS10-ARIN",
    "name" : "Registration",
    "email" : [ "disa.columbus.ns.mbx.arin-registrations@mail.mil" ],
    "phone" : [ "+1-844-347-2457" ],
    "source" : "https://rdap.arin.net/registry/entity/REGIS10-ARIN"
  } ],
  "abuse_contacts" : [ {
    "handle" : "MIL-HSTMST-ARIN",
    "name" : "Network DoD",
    "email" : [ "disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil" ],
    "phone" : [ "+1-844-347-2457" ],
    "source" : "https://rdap.arin.net/registry/entity/MIL-HSTMST-ARIN"
  } ]
}

Peers

AS Number	Description	Country
AS27065	United States Department of Defense DoD	US
AS27064	United States Department of Defense DoD	US
AS27066	United States Department of Defense DoD	US
AS3356	Level 3 Parent, LLC	US

Upstreams

AS Number	Description	Country
AS3356	Level 3 Parent, LLC	US

Downstreams

AS Number	Description	Country
AS27065	United States Department of Defense DoD	US
AS27064	United States Department of Defense DoD	US
AS27066	United States Department of Defense DoD	US

Legacy Routes

140.14.51.0/24 140.14.47.0/24 140.14.45.0/24 140.14.35.0/24 140.14.53.0/24 140.14.49.0/24 140.14.41.0/24 140.14.37.0/24 140.14.43.0/24 140.14.39.0/24

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