AS345

AS345 is a legacy autonomous system number registered under ARIN to the United States Department of Defense (DoD), administered operationally by the Defense Information Systems Agency (DISA) from its Columbus, Ohio facility. The number is not registered individually: it is one entry inside the block record DNIC-ASBLK-00306-00371, which spans AS306 through AS371 and is held under ARIN organization handle USDDD. ARIN's RDAP autnum endpoint for AS345 returns this block-level record, whose top-level registration event is dated 1989-06-30 — one of the earliest ARIN-era allocations, reflecting the DoD's foundational role in the predecessor ARPANET/MILNET. Operationally, AS345 belongs to the DoD Network Information Center (DNIC), the historical authority for DoD IP-address assignment, DNS administration, and the operator of the G root name server (g.root-servers.net). As of the 2026-06-28 query, RIPEstat reports the ASN as not currently announced (as-overview announced=false), with the most recent prefix timelines ending 2026-06-26; this indicates intermittent or recently-withdrawn advertisement rather than dormancy. When advertised, AS345 originates IPv4 space in DoD-reserved ranges — notably 55.0.0.0/8 (e.g. 55.3.0.0/16, 55.195.0.0/16) and 214.24.0.0/16 territory, plus 156.112.250.0/24 — peering only with other intra-DoD ASNs (AS306, AS5974, AS27153) rather than commercial transit or any public IXP. No public peering policy is published. Security posture is clean: AS345 is absent from the Spamhaus ASN-DROP list, shows a 0.00% spam rate on CleanTalk, is rated low fraud risk by Scamalytics, and carries no hijack or route-leak flags. Individual IPs under the broad DoD WHOIS umbrella occasionally surface in AbuseIPDB, but at 0% confidence and with no pattern attributable to AS345 specifically. The notable public DoD-IP episode — the 2021 AS8003 announcement of dark DoD address space by the Defense Digital Service — involved a different ASN and did not implicate AS345.

Operator

United States Department of Defense (DoD); operationally the DoD Network Information Center (DNIC), administered by DISA-Columbus [Confirmed] — ARIN RDAP (registrant org USDDD), https://rdap.arin.net/registry/autnum/345

Country / RIR

US, ARIN [Confirmed] — ARIN RDAP autnum/345

Allocated

1989-06-30 (ARIN registry date — block top-level autnum registration event; not an IEEE date); block last changed 2025-09-12 [Confirmed] — ARIN RDAP autnum top-level events

Org status

active U.S. federal agency (DoD combat-support agency DISA is the operational administrator); registrant org USDDD; admin/tech/abuse contact disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil, +1-844-347-2457 ext2; registrant address 3990 E. Broad Street, Columbus, OH 43218, US

[Confirmed] — ARIN RDAP autnum/345

Website

nic.mil (DoD NIC official domain; unreachable during this research session) [Likely] — https://www.ip2location.com/as345, https://networksdb.io/ip-addresses-of/dod-network-information-center

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-28 — not in Spamhaus ASN-DROP, CleanTalk 0.00% spam rate, Scamalytics low fraud risk, no hijack/route-leak flags on bgp.tools; isolated DoD-umbrella IPs in AbuseIPDB at 0% confidence, not AS345-specific

Network & routing

Network type

U.S. federal government / military — DoD NIC manages IP assignment, DNS, and routing for the Department of Defense; internal government network, not a commercial ISP [Confirmed] — https://ipinfo.io/AS345, https://networksdb.io/autonomous-system/AS345

Size / routing

not currently announced as of 2026-06-28 (RIPEstat as-overview announced=false; prefix timelines ended 2026-06-26). When advertised, originates IPv4 prefixes in DoD ranges 55.x.x.x and 214.24.x.x plus 156.112.250.0/24 (≥9 prefixes visible before payload truncation; bgp.tools/CIDR-Report report ~12 announcements) [Likely] — https://stat.ripe.net/data/as-overview/data.json?resource=AS345, https://stat.ripe.net/data/announced-prefixes/data.json?resource=AS345, https://bgp.tools/as/345

Peering / upstreams

peers only with intra-DoD ASNs (AS306, AS5974, AS27153); no public IXP presence; not listed on PeeringDB under ASN 345; no published peering policy [Likely] — https://bgp.he.net/AS345, https://bgp.tools/as/345, https://www.cidr-report.org/cgi-bin/as-report?as=AS345

RPKI

not assessable from available data — rpki-validation endpoint requires a prefix argument that was not supplied; ROA coverage not determined [Unknown] — https://stat.ripe.net/data/rpki-validation/data.json?resource=AS345

AS rank / customer cone / address estimate

Unknown — payload truncated at 12000 bytes; full prefix inventory, AS rank, and cone not retrievable [Unknown] — RIPEstat announced-prefixes (truncated)

Notable usage

DoD NIC (operated by DISA, Columbus OH) handles DoD IP allocation and DNS, and operates g.root-servers.net, one of the 13 logical Internet root name servers [Confirmed] — https://networksdb.io/ip-addresses-of/dod-network-information-center, https://ipinfo.io/AS345

Related ASNs

AS306 (block parent / co-registered), AS5974, AS27153 (intra-DoD peers); block neighbours AS306–AS371 [Confirmed for block range; Likely for specific peer ASNs] — ARIN RDAP autnum/345, https://bgp.tools/as/345

Block

DNIC-ASBLK-00306-00371, covering AS306–AS371; ARIN handle AS306 at block level [Confirmed] — ARIN RDAP autnum/345 (name, startAutnum 306, endAutnum 371)

Community signal

June 2024 NANOG mailing-list threads describe commercial operators' difficulty contacting DISA/DoD over routing/connectivity to AS345 and AS721 (bureaucratic escalation friction), not a technical-quality complaint; no documented BGP hijack or outage history

[Likely] — https://seclists.org/nanog/2024/Jun/112, https://seclists.org/nanog/2024/Jun/116

Analyst note

Encountered as a DoD block ASN whose individual RDAP record resolves to the block parent (AS306). The 1989-06-30 date is the authoritative block-level ARIN registration event and is recorded as allocated_date. Clean security posture; intermittent announcement as of query date.