206.37.0.0/16

Currently announced by AS721 United States Department of Defense (DoD), in the routed prefix 206.37.0.0/16.

Current ASN: AS721; United States Department of Defense (DoD)
Routed prefix: 206.37.0.0/16; Most specific route covering this prefix
ASNs over time: 1; 1 announcement record
RIR allocation: ARIN; United States · 206.36.0.0/14

Routing data · Nov 2, 2026, 06:27 UTC

ASN historyEvery routed prefix covering 206.37.0.0/16

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
206.37.0.0/16	AS721	United States Department of Defense (DoD)	United States	Before monitoring	2026-11-02 06:27	Announcing

More specific routes41 total

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
206.37.0.0/24	AS1540	Headquarters, USAISC	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.12.0/24	AS1540	Headquarters, USAISC	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.17.0/24	AS1540	Headquarters, USAISC	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.20.0/24	AS27064	United States Department of Defense (DoD)	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.21.0/24	AS27064	United States Department of Defense (DoD)	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.22.0/24	AS1540	Headquarters, USAISC	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.24.0/24	AS1540	Headquarters, USAISC	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.25.0/24	AS1540	Headquarters, USAISC	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.28.0/23	AS668	DREN	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.30.0/23	AS668	DREN	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.106.0/24	AS56	United States Department of Defense (DoD)	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.107.0/24	AS56	United States Department of Defense (DoD)	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.109.0/24	AS56	United States Department of Defense (DoD)	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.112.0/21	AS27064	United States Department of Defense (DoD)	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.138.0/23	AS27066	United States Department of Defense (DoD)	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.198.0/24	AS27064	United States Department of Defense (DoD)	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.202.0/24	AS721	United States Department of Defense (DoD)	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.212.0/24	AS2749	Navy Network Information Center (NNIC)	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.214.0/24	AS5939	United States Department of Defense (DoD)	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.224.0/24	AS668	DREN	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.225.0/24	AS27064	United States Department of Defense (DoD)	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.226.0/24	AS668	DREN	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.227.0/24	AS27064	United States Department of Defense (DoD)	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.228.0/24	AS27064	United States Department of Defense (DoD)	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.229.0/24	AS27064	United States Department of Defense (DoD)	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.230.0/24	AS27064	United States Department of Defense (DoD)	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.231.0/24	AS27064	United States Department of Defense (DoD)	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.232.0/24	AS1540	Headquarters, USAISC	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.233.0/24	AS6034	United States Department of Defense (DoD)	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.238.0/24	AS1590	United States Department of Defense (DoD)	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.240.0/24	AS1540	Headquarters, USAISC	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.242.0/24	AS1540	Headquarters, USAISC	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.243.0/24	AS1540	Headquarters, USAISC	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.245.0/24	AS1540	Headquarters, USAISC	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.247.0/24	AS27064	United States Department of Defense (DoD)	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.249.0/24	AS367	United States Department of Defense (DoD)	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.250.0/23	AS367	United States Department of Defense (DoD)	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.252.0/24	AS668	DREN	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.253.0/24	AS1540	Headquarters, USAISC	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.254.0/23	AS367	United States Department of Defense (DoD)	United States	Before monitoring	2026-11-02 06:27	Announcing
206.37.14.0/24	AS1540	Headquarters, USAISC	United States	Before monitoring	2026-10-31 04:22	Stopped

Change logAll changes

The routes covering this address have had no origin changes since ASNBase started monitoring.

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RIR allocation record

Registry: ARIN
Allocated block: 206.36.0.0/14
Country: United States
Allocation date: 1995-05-30
Status: allocated

From the RIRs’ delegated statistics files. Shows where the addresses are registered, not where they are used.

How monitoring works

Every 2 hours ASNBase takes the bgp.tools global routing table (prefix → origin ASN) and compares it with the previous one. The detected time is the time of that comparison; the actual change can be up to about 2 hours earlier.
Only routes seen by more than 100 bgp.tools peers are listed as changes; routes with less visibility are only kept in the history.
A new announcement counts only if it is still in the next routing table, and a withdrawal only if the prefix is missing from two tables in a row, so short flaps are ignored.
ASNBase has been monitoring since 2026-10-19. “Before monitoring” under “First seen” means the route was already announced when monitoring started; the earlier date is unknown.
Prefixes first seen during the first day of monitoring do not count as new announcements: most of them were simply missing from the table at the moment monitoring started.
Countries and regions follow the ASN’s registration, not the actual location of the IP addresses.