AS352

AS352 is a U.S. Department of Defense autonomous system registered under ARIN within the legacy DNIC block DNIC-ASBLK-00306-00371, which spans AS306 through AS371 and is held entirely by the DoD (registrant handle USDDD). The block's RDAP record reports a top-level registration event of 1989-06-30, making AS352 one of the oldest assignments in the ARIN registry, and a last-changed event of 2025-09-12. Day-to-day administration runs through DISA-Columbus (the Defense Information Systems Agency facility at 300 North James Road, Whitehall, OH), whose hostmaster contact — disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil, +1-844-347-2457 ext 2 — is the published NOC, technical, and abuse point of contact. AS352 behaves as a stub autonomous system: it is single-homed and announces no transit. Routing data (RIPEstat, bgp.he.net, bgp.tools) shows it originating four IPv4 prefixes inside 55.32.0.0/16 (the /16 plus 55.32.80.0/24, 55.32.81.0/24, 55.32.82.0/24) and a single IPv6 prefix, 2608:16b:4300::/40, for roughly 66,304 IPv4 addresses. Its only observed BGP neighbor is AS306, another DoD AS, indicating a fully internal DoD routing topology with no third-party peering and no PeeringDB record. The 55.32.0.0/16 space carries historical "Headquarters, USAISC" (U.S. Army Information Systems Command) labeling. As of the 2026-06-28 RIPEstat snapshot AS352 was not actively announcing — it last appeared in the global table on 2026-06-26 — and IPinfo's most recent scan found zero hosts responding to ICMP, consistent with a tightly firewalled government enclave. No public abuse signal was found across Spamhaus ASN-DROP, AbuseIPDB, NANOG archives, bgp.tools, or bgp.he.net as of 2026-06-28.

Operator

United States Department of Defense (DoD); ARIN registrant handle USDDD, administered by DISA-Columbus [Confirmed] — ARIN RDAP autnum/352, ipinfo.io/AS352

Country / RIR

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

Allocated

1989-06-30 (ARIN registry date from RDAP autnum top-level events — first-party RIR fact, NOT an IEEE date); last changed 2025-09-12 [Confirmed] — ARIN RDAP autnum/352 top-level events, corroborated bgp.tools/as/352

Org status

U.S. federal government agency (Department of Defense); ARIN registrant USDDD, administered by DISA Columbus. The DoD component administering the DNIC namespace is DISA (disa.mil) [Confirmed for registrant/RIR; Likely for DISA web identity] — ARIN RDAP autnum/352, disa.mil

Contacts

disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil; +1-844-347-2457 ext 2 (NOC/technical/abuse, handle MIL-HSTMST-ARIN); DISA-Columbus, 300 North James Road, Whitehall, OH 43213 [Confirmed] — ARIN RDAP autnum/352, RIPEstat abuse-contact-finder

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-28 — not in Spamhaus ASN-DROP, AbuseIPDB, CleanTalk, NANOG archives, bgp.tools, or bgp.he.net; consistent with a non-transit, firewalled government enclave (0 hosts answered ICMP in IPinfo's latest scan)

Network & routing

Network type

government military network; stub AS (single-homed, no transit). IP space labeled "Headquarters, USAISC" (U.S. Army Information Systems Command, active 1984–1996) [Confirmed] — bgp.he.net/AS352, ipinfo.io/AS352

Size

~66,304 IPv4 addresses — 55.32.0.0/16 plus three /24s (55.32.80.0/24, 55.32.81.0/24, 55.32.82.0/24); one IPv6 prefix 2608:16b:4300::/40 [Confirmed] — RIPEstat announced-prefixes, bgp.he.net/AS352, bgp.tools/as/352

Routing/peering

NOT announced as of 2026-06-28 RIPEstat snapshot (last seen 2026-06-26T16:00:00); when active, visible to 324/326 RIS peers (v4) and 324/324 (v6). Single observed neighbor AS306 (DoD) for both v4 and v6 — fully internal DoD topology, no public peering, no PeeringDB record

[Confirmed] — RIPEstat routing-status, bgp.he.net/AS352, peeringdb.com/asn/352 (HTTP 404)

RPKI

no RPKI coverage — 0 RPKI-valid and 0 RPKI-invalid originated prefixes; RIPEstat rpki-validation skipped (no prefix supplied) [Confirmed] — bgp.he.net/AS352

Notable usage

announces 4 IPv4 prefixes within 55.32.0.0/16 (historically "Headquarters, USAISC") and 2608:16b:4300::/40; routing first seen 2008-11-07 (55.32.0.0/16). The 55.32.x.x space appears in some bogon lists from its formerly IANA-reserved status, but DoD legitimately holds the allocation [Confirmed] — RIPEstat routing-status/announced-prefixes, bgp.he.net/AS352, en.wikipedia.org/wiki/Army_Network_Enterprise_Technology_Command

Related ASNs

AS306 (DoD — AS352's sole observed BGP neighbor / upstream); the full DNIC block AS306–AS371 is DoD-held [Confirmed] — ARIN RDAP autnum/352, bgp.he.net/AS352

Registry name / block

DNIC-ASBLK-00306-00371 — the DoD block spanning AS306–AS371; AS352's RDAP resolves to this block record (handle AS306) [Confirmed] — ARIN RDAP autnum/352

Analyst note

Encountered as a legacy DoD stub ASN within a 66-ASN DNIC block. Single internal peer (AS306), no public peering, intermittent announcement (active through 2026-06-26, idle at 2026-06-28 snapshot). Clean — no abuse signal.