AS5974 — AS5974

AS5974 announces 18 IPv4 prefixes covering 92,672 addresses and 3 IPv6 prefixes.

About this network

A US Department of Defense network from the block DNIC-ASBLK-05800-06055, registered to the DoD Network Information Center (DNIC). Its space is used by the Defense Information Systems Agency (DISA) Computing Services Directorate — reverse DNS across several of its ranges resolves under csd.disa.mil.

What it's used for

• Enterprise data-centre and application hosting for DoD components. DISA's Computing Services Directorate runs the Defense Enterprise Computing Centers (DECCs), which provide processing, storage and systems management for the services, agencies and combatant commands.
• Its largest block, 131.77.0.0/16, is registered under the netname DECC-OGDEN — the DECC at Hill Air Force Base, Utah.

Notable

• A government / DoD network. Functionally this is hosting, but it is government-operated infrastructure serving DoD, not a commercial provider.
• The inventory mixes legacy /16s (131.77, 156.112) with 214.x space from the DoD-held /8s, plus a few IPv6 /48s.
• Part of a contiguous run of ASNs (5800–6055) held by the DoD Network Information Center.

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

Announced prefixes

• 131.77.0.0/17
• 131.77.128.0/18
• 131.77.192.0/19
• 131.77.224.0/20
• 131.77.240.0/22
• 131.77.244.0/23
• 131.77.246.0/24
• 131.77.248.0/21
• 156.112.88.0/22
• 156.112.92.0/24
• 156.112.94.0/24
• 209.22.236.0/24
• 214.23.232.0/24
• 214.24.243.0/24
• 214.38.232.0/24
• 214.38.236.0/24
• 214.49.128.0/18
• 214.66.160.0/19
• 2608:101:8::/48
• 2608:102::/48
• 2608:102:8::/48

Upstream networks

• AS27064 United States Department of Defense (DoD)

Downstream networks

• AS345 United States Department of Defense (DoD)

Adjacent networks

• AS27064 United States Department of Defense (DoD)
• AS345 United States Department of Defense (DoD)
• AS27153 United States Department of Defense (DoD)