Autonomous System details

AS721

United States Department of Defense (DoD) · mail.mil

United States

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AS721 – United States Department of Defense (DoD)

Field	Value
Country	United States
Website	mail.mil
Hosted domains	408
IPv4 addresses	72,224,000
IPv6 addresses	158,456,325,028,528,676,000,000,000,000
ASN type	Government
Registry	arin
Allocated	56 years ago on Jan 01, 1970
Updated	8 months ago on Sep 12, 2025

Netblock	Company	Num of IPs
55.0.0.0/8	Headquarters, USAISC	16,777,216
214.0.0.0/8	DoD Network Information Center	16,777,216
215.0.0.0/9	DoD Network Information Center	8,388,608
132.0.0.0/10	Air Force Systems Networking	4,194,304
131.32.0.0/11	Air Force Systems Networking	2,097,152
132.96.0.0/11	Headquarters, USAISC	2,097,152
205.64.0.0/11	Navy Network Information Center (NNIC)	2,097,152
132.80.0.0/12	Headquarters, USAISC	1,048,576
132.128.0.0/12	Headquarters, USAISC	1,048,576
138.144.0.0/12	DoD Network Information Center	1,048,576
131.64.0.0/13	DoD Network Information Center	524,288
137.0.0.0/13	Air Force Systems Networking	524,288
138.136.0.0/13	DoD Network Information Center	524,288
143.144.0.0/13	Air Force Systems Networking	524,288
158.0.0.0/13	DoD Network Information Center	524,288
160.136.0.0/13	Headquarters, USAISC	524,288
160.144.0.0/13	Headquarters, USAISC	524,288
205.56.0.0/13	Navy Network Information Center (NNIC)	524,288
205.96.0.0/13	Navy Network Information Center (NNIC)	524,288
131.76.0.0/14	DoD Network Information Center	262,144
131.80.0.0/14	DoD Network Information Center	262,144
136.212.0.0/14	DoD Network Information Center	262,144
136.216.0.0/14	Headquarters, USAISC	262,144
137.8.0.0/14	DoD Network Information Center	262,144
137.240.0.0/14	Air Force Systems Networking	262,144
138.164.0.0/14	DoD Network Information Center	262,144
138.168.0.0/14	MARINE CORPS CYBERSPACE OPERATIONS GROUP	262,144
140.152.0.0/14	DoD Network Information Center	262,144
143.140.0.0/14	Air Force Systems Networking	262,144
144.100.0.0/14	Headquarters, USAISC	262,144
144.104.0.0/14	Headquarters, USAISC	262,144
153.24.0.0/14	Air Force Systems Networking	262,144
155.152.0.0/14	Headquarters, USAISC	262,144
155.216.0.0/14	Headquarters, USAISC	262,144
158.8.0.0/14	DoD Network Information Center	262,144
158.236.0.0/14	MARINE CORPS CYBERSPACE OPERATIONS GROUP	262,144
158.240.0.0/14	MARINE CORPS CYBERSPACE OPERATIONS GROUP	262,144
131.4.0.0/15	Air Force Systems Networking	131,072
131.74.0.0/15	DoD Network Information Center	131,072
131.86.0.0/15	DoD Network Information Center	131,072
136.220.0.0/15	Headquarters, USAISC	131,072
138.160.0.0/15	DoD Network Information Center	131,072
138.178.0.0/15	Navy Network Information Center (NNIC)	131,072
141.234.0.0/15	DoD Network Information Center	131,072
143.138.0.0/15	Headquarters, USAISC	131,072
143.156.0.0/15	Air Force Systems Networking	131,072
143.212.0.0/15	Headquarters, USAISC	131,072
144.104.0.0/15	Headquarters, USAISC	131,072
144.182.0.0/15	DoD Network Information Center	131,072
147.130.0.0/15	Headquarters, USAISC	131,072
147.216.0.0/15	Headquarters, USAISC	131,072
148.48.0.0/15	DoD Network Information Center	131,072
150.192.0.0/15	Headquarters, USAISC	131,072
153.24.0.0/15	Air Force Systems Networking	131,072
155.8.0.0/15	Headquarters, USAISC	131,072
155.150.0.0/15	Headquarters, USAISC	131,072
155.214.0.0/15	Headquarters, USAISC	131,072
158.14.0.0/15	Headquarters, USAISC	131,072
160.126.0.0/15	DoD Network Information Center	131,072
160.132.0.0/15	Headquarters, USAISC	131,072
164.230.0.0/15	DoD Network Information Center	131,072
198.218.0.0/15	Air Force Systems Networking	131,072
199.112.0.0/15	DoD Network Information Center	131,072
204.222.0.0/15	DoD Network Information Center	131,072
205.104.0.0/15	Navy Network Information Center (NNIC)	131,072
205.106.0.0/15	Navy Network Information Center (NNIC)	131,072
205.108.0.0/15	Navy Network Information Center (NNIC)	131,072
207.132.0.0/15	DoD Network Information Center	131,072
130.22.0.0/16	DoD Network Information Center	65,536
131.16.0.0/16	Air Force Systems Networking	65,536
131.73.0.0/16	DoD Network Information Center	65,536
131.86.0.0/16	DoD Network Information Center	65,536
131.87.0.0/16	DoD Network Information Center	65,536
134.80.0.0/16	Headquarters, USAISC	65,536
134.135.0.0/16	DoD Network Information Center	65,536
134.233.0.0/16	Headquarters, USAISC	65,536
134.235.0.0/16	Headquarters, USAISC	65,536
137.209.0.0/16	DoD Network Information Center	65,536
138.50.0.0/16	Headquarters, USAISC	65,536
138.178.0.0/16	Navy Network Information Center (NNIC)	65,536
138.180.0.0/16	Navy Network Information Center (NNIC)	65,536
139.139.0.0/16	Headquarters, USAISC	65,536
139.241.0.0/16	DoD Network Information Center	65,536
140.1.0.0/16	DoD Network Information Center	65,536
140.21.0.0/16	DoD Network Information Center	65,536
140.201.0.0/16	Headquarters, USAISC	65,536
143.69.0.0/16	Headquarters, USAISC	65,536
143.73.0.0/16	Headquarters, USAISC	65,536
143.74.0.0/16	Headquarters, USAISC	65,536
143.76.0.0/16	Headquarters, USAISC	65,536
143.81.0.0/16	Headquarters, USAISC	65,536
143.83.0.0/16	Headquarters, USAISC	65,536
143.84.0.0/16	Headquarters, USAISC	65,536
143.85.0.0/16	Headquarters, USAISC	65,536
144.109.0.0/16	Headquarters, USAISC	65,536
144.170.0.0/16	Headquarters, USAISC	65,536
153.23.0.0/16	Air Force Systems Networking	65,536
153.26.0.0/16	Air Force Systems Networking	65,536
153.29.0.0/16	Air Force Systems Networking	65,536
155.7.0.0/16	DoD Network Information Center	65,536
155.155.0.0/16	Headquarters, USAISC	65,536
155.252.0.0/16	Navy Network Information Center (NNIC)	65,536
159.77.0.0/16	DoD Network Information Center	65,536
164.87.0.0/16	DoD Network Information Center	65,536
164.236.0.0/16	DoD Network Information Center	65,536
198.25.0.0/16	DoD Network Information Center	65,536
198.26.0.0/16	DoD Network Information Center	65,536
198.220.0.0/16	Air Force Systems Networking	65,536
199.57.0.0/16	DoD Network Information Center	65,536
199.208.0.0/16	DoD Network Information Center	65,536
199.209.0.0/16	DoD Network Information Center	65,536
199.251.0.0/16	DoD Network Information Center	65,536
204.34.0.0/16	DoD Network Information Center	65,536
204.208.0.0/16	Headquarters, USAISC	65,536
205.110.0.0/16	Navy Network Information Center (NNIC)	65,536
205.115.0.0/16	Navy Network Information Center (NNIC)	65,536
206.37.0.0/16	DoD Network Information Center	65,536
206.38.0.0/16	DoD Network Information Center	65,536
206.39.0.0/16	DoD Network Information Center	65,536
209.22.0.0/16	DoD Network Information Center	65,536
214.40.0.0/16	DoD Network Information Center	65,536
143.81.0.0/17	Headquarters, USAISC	32,768
143.81.128.0/17	Headquarters, USAISC	32,768
153.29.0.0/17	Air Force Systems Networking	32,768
153.29.128.0/17	Air Force Systems Networking	32,768
199.211.128.0/17	DoD Network Information Center	32,768
204.37.128.0/17	DoD Network Information Center	32,768
140.35.64.0/18	DoD Network Information Center	16,384
143.85.0.0/18	Headquarters, USAISC	16,384
143.85.64.0/18	Headquarters, USAISC	16,384
143.85.128.0/18	Headquarters, USAISC	16,384
143.85.192.0/18	Headquarters, USAISC	16,384
192.156.0.0/18	MARINE CORPS CYBERSPACE OPERATIONS GROUP	16,384
198.97.128.0/18	Headquarters, USAISC	16,384
198.250.128.0/18	DoD Network Information Center	16,384
198.250.192.0/18	DoD Network Information Center	16,384
199.9.64.0/18	DoD Network Information Center	16,384
199.32.128.0/18	DoD Network Information Center	16,384
199.211.64.0/18	DoD Network Information Center	16,384
199.211.192.0/18	DoD Network Information Center	16,384
199.252.128.0/18	DoD Network Information Center	16,384
215.65.0.0/18	DoD Network Information Center	16,384
155.21.192.0/19	Headquarters, USAISC	8,192
192.172.0.0/19	DoD Network Information Center	8,192
198.97.96.0/19	DoD Network Information Center	8,192
198.250.192.0/19	DoD Network Information Center	8,192
192.138.64.0/20	DoD Network Information Center	4,096
192.156.64.0/20	MARINE CORPS CYBERSPACE OPERATIONS GROUP	4,096
192.188.208.0/20	Headquarters, USAISC	4,096
192.240.128.0/20	DoD Network Information Center	4,096
198.97.192.0/20	Headquarters, USAISC	4,096
198.97.240.0/20	DoD Network Information Center	4,096
198.250.224.0/20	DoD Network Information Center	4,096
199.114.32.0/20	Headquarters, USAISC	4,096
199.122.32.0/20	Headquarters, USAISC	4,096
199.211.176.0/20	DoD Network Information Center	4,096
199.225.0.0/20	DoD Network Information Center	4,096
199.252.32.0/20	DoD Network Information Center	4,096
192.86.112.0/21	Headquarters, USAISC	2,048
192.86.232.0/21	Headquarters, USAISC	2,048
192.108.8.0/21	Navy Network Information Center (NNIC)	2,048
192.108.176.0/21	Headquarters, USAISC	2,048
192.138.24.0/21	DoD Network Information Center	2,048
192.153.136.0/21	Headquarters, USAISC	2,048
192.153.144.0/21	Headquarters, USAISC	2,048
198.49.184.0/21	Headquarters, USAISC	2,048
198.97.72.0/21	Navy Network Information Center (NNIC)	2,048
198.97.192.0/21	Headquarters, USAISC	2,048
198.154.8.0/21	Air Force Systems Networking	2,048
198.250.240.0/21	DoD Network Information Center	2,048
199.122.56.0/21	Headquarters, USAISC	2,048
199.123.72.0/21	Headquarters, USAISC	2,048
199.123.80.0/21	Headquarters, USAISC	2,048
199.123.104.0/21	DoD Network Information Center	2,048
199.124.16.0/21	Headquarters, USAISC	2,048
204.37.8.0/21	DoD Network Information Center	2,048
192.129.64.0/22	Headquarters, USAISC	1,024
192.138.80.0/22	DoD Network Information Center	1,024
192.153.132.0/22	Headquarters, USAISC	1,024
192.187.4.0/22	Navy Network Information Center (NNIC)	1,024
192.240.144.0/22	DoD Network Information Center	1,024
198.154.72.0/22	DoD Network Information Center	1,024
6.16.172.0/23	Headquarters, USAISC	512
143.86.204.0/23	Headquarters, USAISC	512
146.55.22.0/23	Headquarters, USAISC	512
155.29.48.0/23	Headquarters, USAISC	512
155.29.166.0/23	Headquarters, USAISC	512
156.112.148.0/23	DoD Network Information Center	512
192.73.26.0/23	Headquarters, USAISC	512
192.73.28.0/23	Headquarters, USAISC	512
192.101.132.0/23	DoD Network Information Center	512
192.111.116.0/23	Navy Network Information Center (NNIC)	512
192.132.84.0/23	Headquarters, USAISC	512
192.153.244.0/23	DoD Network Information Center	512
192.156.80.0/23	MARINE CORPS CYBERSPACE OPERATIONS GROUP	512
199.122.4.0/23	DoD Network Information Center	512
199.123.122.0/23	Headquarters, USAISC	512
6.16.174.0/24	Headquarters, USAISC	256
6.64.181.0/24	Headquarters, USAISC	256
131.78.3.0/24	DoD Network Information Center	256
131.78.204.0/24	DoD Network Information Center	256
138.162.5.0/24	Navy Network Information Center (NNIC)	256
140.13.73.0/24	DoD Network Information Center	256
140.14.35.0/24	DoD Network Information Center	256
140.14.37.0/24	DoD Network Information Center	256
140.14.39.0/24	DoD Network Information Center	256
140.14.41.0/24	DoD Network Information Center	256
140.14.43.0/24	DoD Network Information Center	256
140.14.45.0/24	DoD Network Information Center	256
140.14.47.0/24	DoD Network Information Center	256
140.14.49.0/24	DoD Network Information Center	256
140.14.51.0/24	DoD Network Information Center	256
140.14.53.0/24	DoD Network Information Center	256
140.153.72.0/24	Headquarters, USAISC	256
143.81.103.0/24	Headquarters, USAISC	256
143.86.176.0/24	Headquarters, USAISC	256
144.251.43.0/24	DoD Network Information Center	256
146.55.124.0/24	Headquarters, USAISC	256
146.55.127.0/24	Headquarters, USAISC	256
192.41.202.0/24	DoD Network Information Center	256
192.42.41.0/24	Navy Network Information Center (NNIC)	256
192.86.252.0/24	Headquarters, USAISC	256
192.132.83.0/24	Headquarters, USAISC	256
192.240.129.0/24	DoD Network Information Center	256
198.25.0.0/24	DoD Network Information Center	256
199.123.91.0/24	Headquarters, USAISC	256
199.252.143.0/24	DoD Network Information Center	256
199.252.154.0/24	DoD Network Information Center	256
199.252.155.0/24	DoD Network Information Center	256
199.252.157.0/24	DoD Network Information Center	256
199.252.162.0/24	DoD Network Information Center	256
199.252.180.0/24	DoD Network Information Center	256
204.34.186.0/24	DoD Network Information Center	256
205.56.162.0/24	Navy Network Information Center (NNIC)	256
205.69.238.0/24	Navy Network Information Center (NNIC)	256
206.37.202.0/24	DoD Network Information Center	256
215.67.59.0/24	DoD Network Information Center	256

Netblock	Company
2608:120::/32	United States Department of Defense (DoD)
2608:121::/32	United States Department of Defense (DoD)

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WHOIS Details

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                                                ASHandle:       AS721
                                                OrgID:          AS721
                                                ASName:         AS721
                                                ASNumber:       AS721
                                                RegDate:        0000-00-00
                                                Updated:        0000-00-00
                                                TechHandle:     AA00-AAAA
                                                Source:         AAAA

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IP WHOIS API & Database

Hosted Domains

There are 408 domain names hosted across 303 IP addresses on this ASN.

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IP Address	Domain	Domains on this IP
148.49.23.144	██████████	20
136.213.40.36	██████████	7
131.57.48.17	█████████	6
55.223.52.2	████████	6
55.141.72.18	██████████	4
55.200.197.31	██████████	4
140.153.192.17	██████████	3
148.49.23.145	██████████	3
55.222.169.231	██████████	2
55.187.2.111	██████████	2

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Peers

There are 4 peers for this ASN.

Peers	Name
AS27064	United States Department of Defense (DoD)
AS27065	United States Department of Defense (DoD)
AS27066	United States Department of Defense (DoD)
AS3356	Level 3 Parent, LLC

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ASN API & Database

Upstreams

There is 1 peer for this ASN.

upstreams	Name
AS3356	Level 3 Parent, LLC

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ASN API & Database

Downstreams

There are 3 downstreams for this ASN.

Downstreams	Name
AS27064	United States Department of Defense (DoD)
AS27065	United States Department of Defense (DoD)
AS27066	United States Department of Defense (DoD)

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ASN API & Database

Pingable IPs

2 IPs in this ASN replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address	ASN	Details
140.14.49.130	AS721 United States Department of Defense (DoD)	`16.15ms` from London, GB
140.14.51.130	AS721 United States Department of Defense (DoD)	`4.67ms` from Frankfurt am Main, DE

Other Pingable IPs

Below is a random selection of 25 IPs that replied to an ICMP ping during our most recent internet scan.

IP Address	ASN	Details
83.80.152.1	AS33915 Vodafone Libertel B.V.	`2.83ms` from Amsterdam, NL
94.213.208.1	AS33915 Vodafone Libertel B.V.	`5.04ms` from Amsterdam, NL
173.28.224.1	AS30036 Mediacom Communications Corp	`2.55ms` from Atlanta, US
69.246.160.1	AS7922 Comcast Cable Communications, LLC	`7.57ms` from Atlanta, US
211.103.148.49	AS4808 China Unicom Beijing Province Network	`5.01ms` from Beijing, CN
121.20.144.1	AS4837 CHINA UNICOM China169 Backbone	`13.86ms` from Beijing, CN
82.82.176.1	AS3209 Vodafone GmbH	`4.41ms` from Berlin, DE
141.76.48.241	AS680 Verein zur Foerderung eines Deutschen Forschungsnetzes e.V.	`3.93ms` from Berlin, DE
181.51.48.1	AS10620 Telmex Colombia S.A.	`3.85ms` from Bogota, CO
95.77.34.225	AS12302 Vodafone Romania S.A.	`0.71ms` from Bucharest, RO
190.120.60.1	AS27927 Coop. Popular de Elec., Obras y Servicios Pub. de Santa Rosa LTDA	`11.63ms` from Buenos Aires, AR
181.165.239.1	AS7303 Telecom Argentina S.A.	`0.87ms` from Buenos Aires, AR
190.188.152.1	AS7303 Telecom Argentina S.A.	`6.64ms` from Buenos Aires, AR
62.251.132.1	AS6713 Office National des Postes et Telecommunications ONPT (Maroc Telecom) / IAM	`5.06ms` from Casablanca, MA
118.251.116.1	AS4134 CHINANET BACKBONE	`3.93ms` from Changsha, CN
174.108.106.113	AS11426 Charter Communications Inc	`3.26ms` from Charlotte, US
111.9.234.17	AS9808 China Mobile Communications Group Co., Ltd.	`4.32ms` from Chengdu, CN
218.248.18.97	AS9829 National Internet Backbone	`2.27ms` from Chennai, IN
12.10.112.97	AS7018 AT&T Enterprises, LLC	`11.51ms` from Chicago, US
80.167.113.1	AS3292 TDC Holding A/S	`3.57ms` from Copenhagen, DK
14.176.177.49	AS45899 VNPT Corp	`5.07ms` from Da Nang, VN
162.194.225.145	AS7018 AT&T Enterprises, LLC	`4.91ms` from Dallas, US
69.39.27.1	AS21803 Cedar Networks	`8.85ms` from Denver, US
90.222.204.65	AS5607 Sky UK Limited	`1.80ms` from Erith, GB
189.195.146.1	AS13999 Mega Cable, S.A. de C.V.	`8.62ms` from Guadalajara, MX

Traceroute

Below is a recent traceroute taken from the IPinfo ProbeNet to an IP in this ASN. Learn more.

traceroute -a -n -q1 -f2 -m10 205.68.172.100

traceroute to 205.68.172.100 (205.68.172.100): 10 hops max, 52 byte packets

2 [AS49800] 37.186.95.25 4.842 ms

3 *

4 *

5 *

6 *

7 [AS3356] 64.159.215.38 174.365 ms

8 *

9 *

10 *

Measurement taken from

IPinfo ProbeNet in Abovyan, AM

On April 24th 2026

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What is an ASN?

Autonomous System Numbers (ASNs) are assigned to entities such as Internet Service Providers and other large organizations that control blocks of IP addresses. This network page, and the organization field that's shown on the main IP address information page and also returned in the geolocation API are based on the ASN.

The ASN details will often correspond to the IP address owner, but for smaller organizations it may be that organization's parent, or their ISP. Find out more about AS721 at robtex.

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