ASN Lookup Tool

United States Department of Defense DoD mail.mil US US 229 Routes

AS Data

AS721

AS721 – United States Department of Defense DoD

AS Number 721
AS Name DNIC-ASBLK-00721-00726
Organization United States Department of Defense DoD (usddd)
Country US
Website mail.mil
Number of IPv4 Routes 227
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.

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

Get ASN API Key ASN API Docs
Powered by ASN data

IP Ranges

Route # IPs
131.64.0.0/13 524288
143.83.0.0/16 65536
192.153.132.0/22 1024
132.0.0.0/10 4194304
141.234.0.0/15 131072
206.37.0.0/16 65536
131.73.0.0/16 65536
192.111.116.0/23 512
143.144.0.0/13 524288
134.135.0.0/16 65536
192.86.112.0/21 2048
164.236.0.0/16 65536
192.101.132.0/23 512
214.40.0.0/16 65536
159.77.0.0/16 65536
198.97.72.0/21 2048
148.48.0.0/15 131072
192.42.41.0/24 256
144.182.0.0/15 131072
192.188.208.0/20 4096
205.64.0.0/11 2097152
192.156.0.0/18 16384
198.250.224.0/20 4096
143.86.204.0/23 512
199.112.0.0/15 131072
205.104.0.0/15 131072
199.208.0.0/16 65536
138.136.0.0/13 524288
155.7.0.0/16 65536
198.25.0.0/24 256
143.85.128.0/18 16384
143.81.128.0/17 32768
131.80.0.0/14 262144
192.240.129.0/24 256
134.235.0.0/16 65536
155.155.0.0/16 65536
204.222.0.0/15 131072
6.16.174.0/24 256
6.64.181.0/24 256
146.55.127.0/24 256
138.50.0.0/16 65536
155.29.166.0/23 512
192.108.8.0/21 2048
192.41.202.0/24 256
207.132.0.0/15 131072
146.55.22.0/23 512
160.144.0.0/13 524288
136.220.0.0/15 131072
136.216.0.0/14 262144
131.78.204.0/24 256
140.201.0.0/16 65536
153.29.128.0/17 32768
198.218.0.0/15 131072
199.251.0.0/16 65536
138.178.0.0/15 131072
144.104.0.0/14 262144
198.220.0.0/16 65536
199.252.154.0/24 256
192.129.64.0/22 1024
199.225.0.0/20 4096

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:        2025-03-13
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

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

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


#
# 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
AS27064 DoD Network Information Center US
AS27065 United States Department of Defense DoD US
AS27066 United States Department of Defense (DoD) US
AS27064 United States Department of Defense DoD US
AS27065 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

Ready to get started?Get Started with IP Intelligence API Today

Get Started
CTA Illustration

Frequently Asked Questions

ASN AS721 is an Autonomous System Number used to identify a network for BGP internet routing.
AS721 is listed under United States Department of Defense DoD.
Peers are lateral network interconnections, upstreams are transit providers, and downstreams are customer networks receiving connectivity.
Routes and IP ranges are the network prefixes announced by the ASN on the internet and show the address space it originates.
WHOIS provides registration and contact context for ASN ownership, administration, and operational reference.
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.