AS342

AS342 is a legacy autonomous system number registered under ARIN to the United States Department of Defense (DoD), org handle USDDD, and administratively managed by the Defense Information Systems Agency (DISA) out of Columbus, Ohio. It is not an independently named operator AS but one slot inside the contiguous DoD block DNIC-ASBLK-00306-00371 (AS306 through AS371), an early military allocation dating to the formative years of the commercial Internet. In routing terms AS342 is a small stub: every consulted source (RIPEstat, bgp.he.net, bgp.tools) agrees it originates seven IPv4 prefixes — anchored by 55.56.0.0/16, roughly 65,536 addresses — plus a single IPv6 prefix (2608:16a:6200::/40), with AS306 (another DoD block) as its sole observed upstream and peer. The 55.56.0.0/16 space is associated with Headquarters, U.S. Army Information Systems Command (USAISC). RIPEstat's as-overview read "announced: false" at the 2026-06-28 query instant, but that is a point-in-time artifact — announced-prefixes timelines show activity through 2026-06-26, so the AS is effectively live. RPKI coverage is absent (zero ROAs, no valid or invalid originations), and bgp.he.net flags bogon announcements, both routing-hygiene observations rather than abuse signals on legitimately DoD-allocated 55.0.0.0/8 space. No notable public abuse signal was found as of June 2026 — AS342 is not in Spamhaus ASN-DROP, CleanTalk shows a 0% spam rate, and NANOG archives surface no incidents — consistent with a closed military network carrying essentially no public mail or hosting traffic.

Operator

United States Department of Defense (DoD); ARIN org handle USDDD; administratively managed by DISA (Defense Information Systems Agency), Columbus, OH [Confirmed] — ARIN RDAP autnum/342, ipinfo.io/AS342

Country / RIR

US, ARIN [Confirmed] — RIPEstat abuse-contact-finder (authoritative_rir: arin), ARIN RDAP

Allocated

1989-06-30 (ARIN registry date for the block DNIC-ASBLK-00306-00371; an RIR first-party fact, NOT an IEEE date); last changed 2025-09-12 [Confirmed] — ARIN RDAP autnum top-level events

ASN block

AS342 falls within the ARIN block DNIC-ASBLK-00306-00371 (AS306–AS371), all registered to the U.S. Department of Defense [Confirmed] — ARIN RDAP autnum/342

Org status

active U.S. federal executive-branch agency (Department of Defense); ARIN-registered since 1989-06-30 under org handle USDDD; operational contact is DISA, Columbus, OH [Confirmed] — ARIN RDAP, ipinfo.io/AS342

Contacts

disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil; +1-844-347-2457 ext 2; DISA-Columbus, 300 North James Road, Whitehall, OH 43213 [Confirmed] — ARIN RDAP autnum/342

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-28 — not in Spamhaus ASN-DROP (425-entry list, AS342 absent), CleanTalk shows 0% spam rate, NANOG archives surface no threads; no hijack/leak/malware attribution

Network & routing

Network type

government/military stub AS (single-homed, no transit provided to outside parties); a closed DoD routing segment [Confirmed] — ipinfo.io/AS342, bgp.tools/as/342, ARIN RDAP

Size

7 IPv4 prefixes / ~65,536 IPv4 addresses (primary block 55.56.0.0/16) and 1 IPv6 prefix (2608:16a:6200::/40) [Confirmed] — bgp.he.net/AS342, bgp.tools/as/342, RIPEstat announced-prefixes

Routing/peering

AS306 (DoD, DNIC-ASBLK-00306-00371) is the sole observed upstream and peer; pure stub/leaf with no documented customers [Confirmed for the AS306 relationship] — bgp.he.net/AS342, bgp.tools/as/342. RIPEstat as-overview read "announced: false" at the 2026-06-28 query instant, a point-in-time/lag artifact (timelines show activity through 2026-06-26)

[Likely] — RIPEstat

Peering policy

Unknown — no PeeringDB record for AS342 and no public peering policy listed; DoD networks are generally closed to commercial peering [Unknown] — peeringdb.com (no AS342 record), bgp.tools/as/342

RPKI

no ROAs configured (0 RPKI-valid, 0 RPKI-invalid originations); routing-hygiene gap, not an abuse signal [Confirmed] — bgp.he.net/AS342

Notable usage

55.56.0.0/16 is associated with Headquarters, U.S. Army Information Systems Command (USAISC) [Likely] — ipinfo.io/AS342, bgp.he.net/AS342

Related ASNs

AS306 (sole upstream/peer; same DoD block). The full block DNIC-ASBLK-00306-00371 spans AS306–AS371 under USDDD [Confirmed] — ARIN RDAP autnum/342

Announced prefixes (v4)

55.56.0.0/16, 55.56.2.0/24, 55.56.11.0/24, 55.56.99.0/24, 55.56.196.0/22, 55.56.210.0/24, 55.56.215.0/24 [Confirmed] — RIPEstat announced-prefixes (resource=AS342)

Bogon flag

bgp.he.net flags AS342 as announcing bogons; DoD 55.0.0.0/8 is legitimately ARIN-registered DoD space, so the flag likely reflects legacy filter-list classification rather than truly unroutable space [Likely] — bgp.he.net/AS342

Analyst note

Encountered as a small DoD/USAISC stub AS inside the AS306–AS371 military block; single peer (AS306), no RPKI, bogon flag on legitimate 55/8 space. Clean, low-footprint, closed network.