AS306 — DNIC-ASBLK-00306-00371 - United States Department of Defense (DoD)

AS306 announces 30 IPv4 prefixes covering 4,492,288 addresses and 53 IPv6 prefixes.

About this network

An early US Department of Defense allocation from the block DNIC-ASBLK-00306-00371, registered to the DoD Network Information Center (DNIC).

What it's used for

• US government / military network operations. The specific site or unit is not publicly identified in the block registration.

Notable

• A government / DoD network, not a commercial ISP or host. It sits in a contiguous block of low-numbered ASNs (00306–00371) held by the DoD Network Information Center from the internet's earliest years, and announces a large amount of address space.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 55.10.0.0/16
• 55.15.0.0/16
• 55.17.0.0/16
• 55.22.69.0/24
• 55.25.5.0/24
• 55.38.0.0/16
• 55.44.0.0/16
• 55.51.0.0/19
• 55.51.32.0/20
• 55.51.48.0/21
• 55.51.58.0/23
• 55.51.60.0/22
• 55.51.64.0/18
• 55.51.128.0/17
• 55.61.0.0/16
• 55.68.0.0/16
• 55.85.0.0/16
• 55.86.2.0/24
• 55.194.0.0/16
• 132.79.0.0/16
• 132.80.0.0/12
• 132.96.0.0/11
• 132.128.0.0/13
• 132.136.0.0/16
• 132.141.0.0/18
• 132.141.128.0/18
• 132.142.0.0/21
• 132.142.9.0/24
• 132.142.10.0/24
• 132.142.131.0/24
• 2608:10a:7311::/48
• 2608:10a:7314::/48
• 2608:10a:7320::/46
• 2608:10a:7336::/48
• 2608:10a:7347::/48
• 2608:10a:7356::/48
• 2608:10a:7360::/48
• 2608:10b:3800::/40
• 2608:12a:7413::/48
• 2608:12a:7415::/48
• 2608:12a:7425::/48
• 2608:12a:7426::/48
• 2608:12a:7435::/48
• 2608:12a:7437::/48
• 2608:12a:7441::/48
• 2608:12a:7444::/48
• 2608:12a:7446::/48
• 2608:12a:7453::/48
• 2608:12a:7455::/48
• 2608:14a:7516::/47
• 2608:14a:7523::/48
• 2608:14a:7524::/48
• 2608:14a:7527::/48
• 2608:14a:7529::/48
• 2608:14a:7531::/48
• 2608:14a:7532::/48
• 2608:14a:7539::/48
• 2608:14a:7540::/48
• 2608:14a:7542::/48
• 2608:14a:7545::/48
• 2608:14a:7549::/48
• 2608:14a:7551::/48
• 2608:14a:7557::/48
• 2608:14a:7563::/48
• 2608:16a:7100::/40
• 2608:16a:7630::/48
• 2608:16a:7643::/48
• 2608:16a:7659::/48
• 2608:16a:7661::/48
• 2608:16a:7671::/48
• 2608:16a:7672::/48
• 2608:16a:7679::/48
• 2608:18b:7710::/48
• 2608:18b:7718::/47
• 2608:18b:7728::/48
• 2608:18b:7734::/48
• 2608:18b:7750::/48
• 2608:18b:7752::/48
• 2608:18b:7754::/48
• 2608:18b:7758::/48
• 2609:e0f6:9941::/48
• 2609:e0f6:9950::/48
• 2609:e0f6:9958::/48

Upstream networks

• AS1540 Headquarters, USAISC
• AS367 United States Department of Defense (DoD)
• AS27066 United States Department of Defense (DoD)

Downstream networks

• AS335 United States Department of Defense (DoD)
• AS344 United States Department of Defense (DoD)
• AS370 United States Department of Defense (DoD)
• AS325 United States Department of Defense (DoD)
• AS337 United States Department of Defense (DoD)
• AS362 United States Department of Defense (DoD)
• AS369 United States Department of Defense (DoD)
• AS334 United States Department of Defense (DoD)
• AS356 United States Department of Defense (DoD)
• AS326 United States Department of Defense (DoD)
• AS336 United States Department of Defense (DoD)
• AS366 United States Department of Defense (DoD)
• AS1530 Headquarters, USAISC
• AS348 United States Department of Defense (DoD)
• AS357 United States Department of Defense (DoD)
• AS349 United States Department of Defense (DoD)
• AS361 United States Department of Defense (DoD)
• AS351 United States Department of Defense (DoD)
• AS329 United States Department of Defense (DoD)
• AS321 United States Department of Defense (DoD)
• AS364 United States Department of Defense (DoD)
• AS316 United States Department of Defense (DoD)
• AS346 United States Department of Defense (DoD)
• AS347 United States Department of Defense (DoD)
• AS319 United States Department of Defense (DoD)

Adjacent networks

• AS1540 Headquarters, USAISC
• AS335 United States Department of Defense (DoD)
• AS344 United States Department of Defense (DoD)
• AS370 United States Department of Defense (DoD)
• AS325 United States Department of Defense (DoD)
• AS337 United States Department of Defense (DoD)
• AS362 United States Department of Defense (DoD)
• AS369 United States Department of Defense (DoD)
• AS334 United States Department of Defense (DoD)
• AS356 United States Department of Defense (DoD)
• AS326 United States Department of Defense (DoD)
• AS336 United States Department of Defense (DoD)
• AS366 United States Department of Defense (DoD)
• AS1530 Headquarters, USAISC
• AS348 United States Department of Defense (DoD)
• AS357 United States Department of Defense (DoD)
• AS349 United States Department of Defense (DoD)
• AS361 United States Department of Defense (DoD)
• AS351 United States Department of Defense (DoD)
• AS329 United States Department of Defense (DoD)
• AS321 United States Department of Defense (DoD)
• AS364 United States Department of Defense (DoD)
• AS316 United States Department of Defense (DoD)
• AS346 United States Department of Defense (DoD)
• AS347 United States Department of Defense (DoD)

Routing security

• RPKI: 0 valid, 0 invalid and 333 not-found announcements; 0 ROAs.
• ASPA: none published.
• IRR: 0% of announcements registered; 0 route objects.
• Listed in as-sets: AS204464:AS-BLACKLIST, AS213434:AS-BLACKLIST.