$ query “AS721” --type=asn → 1 result(s)

AS721 · DNIC-ASBLK-00721-00726

United States Department of Defense (DoD)

AS721 is run by United States Department of Defense (DoD) and is a government/public-admin access provider, based in the United States. The system announces a whopping 72.2 million IPv4 addresses (1.95% of routable IPv4 space), including a /8, and supports IPv6. Most of its address space is geolocated to the United States, with additional presence in Australia.

  • Space Overlord — Over 10 million IPv4 addresses

Basic Information

Country
🇺🇸 United States
Category
Government/Public Administration
Network Role
Access Provider
Data Origin
Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
Last Changed
March 04, 2026
Last Seen
April 28, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
227 / 182
IPv6 Prefixes (raw / aggregated)
2 / 1
IPv4 Addresses
72 221 440
Largest IPv4 Prefix
/8 (16 777 216 addresses)
Largest IPv6 Prefix
/31
Geolocated Countries
🇺🇸 United States (94 639 360 IPs), 🇦🇺 Australia (4 543 488 IPs)
Prefix Changed
April 20, 2026

Reputation

Reputation
Good — 1 flagged IPs out of 72 221 440 total (0.00%)

Connectivity Summary

Upstream Providers
2 upstreams providing transit
Downstream Customers
3 downstreams buying transit
Degree
5 unique BGP neighbors
Reach
160 networks in customer cone

Upstream Providers (2)

Prefix Lists

IPv4 Prefixes (227 total)

  • 214.0.0.0/8 (16 777 216 addresses (/8 prefix))
  • 55.0.0.0/8 (16 777 216 addresses (/8 prefix))
  • 215.0.0.0/9 (8 388 608 addresses (/9 prefix))
  • 132.0.0.0/10 (4 194 304 addresses (/10 prefix))
  • 132.96.0.0/11 (2 097 152 addresses (/11 prefix))
  • 205.64.0.0/11 (2 097 152 addresses (/11 prefix))
  • 131.32.0.0/11 (2 097 152 addresses (/11 prefix))
  • 138.144.0.0/12 (1 048 576 addresses (/12 prefix))
  • 132.128.0.0/12 (1 048 576 addresses (/12 prefix))
  • 132.80.0.0/12 (1 048 576 addresses (/12 prefix))
  • 131.64.0.0/13 (524 288 addresses (/13 prefix))
  • 160.144.0.0/13 (524 288 addresses (/13 prefix))
  • 138.136.0.0/13 (524 288 addresses (/13 prefix))
  • 160.136.0.0/13 (524 288 addresses (/13 prefix))
  • 205.56.0.0/13 (524 288 addresses (/13 prefix))
  • 158.0.0.0/13 (524 288 addresses (/13 prefix))
  • 205.96.0.0/13 (524 288 addresses (/13 prefix))
  • 143.144.0.0/13 (524 288 addresses (/13 prefix))
  • 137.0.0.0/13 (524 288 addresses (/13 prefix))
  • 158.240.0.0/14 (262 144 addresses (/14 prefix))
  • 158.8.0.0/14 (262 144 addresses (/14 prefix))
  • 158.236.0.0/14 (262 144 addresses (/14 prefix))
  • 136.212.0.0/14 (262 144 addresses (/14 prefix))
  • 136.216.0.0/14 (262 144 addresses (/14 prefix))
  • 155.216.0.0/14 (262 144 addresses (/14 prefix))
  • 140.152.0.0/14 (262 144 addresses (/14 prefix))
  • 137.8.0.0/14 (262 144 addresses (/14 prefix))
  • 155.152.0.0/14 (262 144 addresses (/14 prefix))
  • 137.240.0.0/14 (262 144 addresses (/14 prefix))
  • 153.24.0.0/14 (262 144 addresses (/14 prefix))
  • 131.80.0.0/14 (262 144 addresses (/14 prefix))
  • 131.76.0.0/14 (262 144 addresses (/14 prefix))
  • 144.104.0.0/14 (262 144 addresses (/14 prefix))
  • 144.100.0.0/14 (262 144 addresses (/14 prefix))
  • 138.164.0.0/14 (262 144 addresses (/14 prefix))
  • 138.168.0.0/14 (262 144 addresses (/14 prefix))
  • 205.104.0.0/14 (262 144 addresses (/14 prefix))
  • 143.140.0.0/14 (262 144 addresses (/14 prefix))
  • 141.234.0.0/15 (131 072 addresses (/15 prefix))
  • 131.4.0.0/15 (131 072 addresses (/15 prefix))
  • 198.218.0.0/15 (131 072 addresses (/15 prefix))
  • 199.112.0.0/15 (131 072 addresses (/15 prefix))
  • 199.208.0.0/15 (131 072 addresses (/15 prefix))
  • 207.132.0.0/15 (131 072 addresses (/15 prefix))
  • 164.230.0.0/15 (131 072 addresses (/15 prefix))
  • 131.74.0.0/15 (131 072 addresses (/15 prefix))
  • 206.38.0.0/15 (131 072 addresses (/15 prefix))
  • 131.86.0.0/15 (131 072 addresses (/15 prefix))
  • 160.132.0.0/15 (131 072 addresses (/15 prefix))
  • 160.126.0.0/15 (131 072 addresses (/15 prefix))
  • and 132 more

IPv6 Prefixes (2 total)

  • 2608:120::/31