AS335

AS335 is a legacy autonomous system number registered under ARIN to the United States Department of Defense (DoD), held within the early DoD ASN block DNIC-ASBLK-00306-00371 (covering AS306 through AS371). Operationally it is managed by the Defense Information Systems Agency (DISA) from its Columbus, Ohio facility, and it forms part of the DoD's Defense Information Systems Network (DISN) — the department's global classified and unclassified voice, video, and data transport backbone. AS335 is a single-homed stub AS: every routing source consulted classifies it as non-transit, peering only with AS306 (also DoD) as its sole upstream, with zero downstream customers. It originates the DoD's historic 55.x.x.x address space, including the /16 aggregates 55.27.0.0/16, 55.67.0.0/16, and 55.74.0.0/16 (roughly 196,608 unique IPv4 addresses, the larger ~257k figure double-counting deaggregated more-specifics) plus the IPv6 block 2608:14b:3200::/40. RIPEstat RIS observed routing for these prefixes through 2026-06-26; the as-overview "announced: false" flag reflects a later 2026-06-28 snapshot taken after the last RIS update, not a withdrawal. There is no public PeeringDB entry and no open peering policy — DISN connectivity is governed by DoD-internal processes (the DISN Connection Process Guide under DoDI 8010.01). No notable public abuse signal was found as of 2026-06-28: Scamalytics rates the operator 0/100 fraud risk, and AS335 is absent from Spamhaus DROP/ASN-DROP, major threat-intelligence feeds, and NANOG abuse discussions. The ARIN RDAP top-level autnum registration event of 1989-06-30 is the authoritative allocated_date for the block.

Operator

United States Department of Defense (DoD); registrant handle USDDD; operationally managed by DISA (Defense Information Systems Agency), DISA-Columbus, OH [Confirmed] — ARIN RDAP autnum/335 entities (registrant), ipinfo.io/AS335

Country / RIR

US, ARIN [Confirmed] — ARIN RDAP autnum/335, RIPEstat abuse-contact-finder

Allocated

1989-06-30 (ARIN registry date for the block; NOT an IEEE date — IEEE publishes no ASN registration dates); last changed 2025-09-12 [Confirmed] — ARIN RDAP autnum top-level events

Org status

U.S. federal government combat-support department (DoD); operational NOC via DISA-Columbus, hostmaster contact disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil [Confirmed] — ARIN RDAP autnum/335

Contacts

abuse/hostmaster disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil; registrant address 3990 E. Broad Street, Columbus, OH 43218; DISA-Columbus admin 300 North James Road, Whitehall, OH 43213 [Confirmed] — ARIN RDAP autnum/335, RIPEstat abuse-contact-finder

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal as of 2026-06-28 — Scamalytics 0/100 fraud risk; absent from Spamhaus DROP/ASN-DROP, major threat-intel feeds, and NANOG archives; only isolated low-confidence AbuseIPDB reports on individual IPs within the broader DoD NIC space, not an AS-level pattern [Confirmed for Scamalytics; Likely for blocklist/NANOG absence] — scamalytics.com/ip/isp/dod-network-information-center, spamhaus.org, abuseipdb.com

Network & routing

Network type

U.S. government / military stub AS; single-homed, non-transit; part of the DoD DISN [Confirmed] — ipinfo.io/AS335, bgp.tools/as/335, ARIN RDAP

Size

three /16 aggregates (55.27.0.0/16, 55.67.0.0/16, 55.74.0.0/16) ≈ 196,608 unique IPv4 addresses; 229 announced v4 prefixes including deaggregated more-specifics; 1 IPv6 prefix (2608:14b:3200::/40) [Confirmed for prefixes; Likely for address-count derivation] — RIPEstat announced-prefixes (resource=AS335)

Routing/peering

single peer/upstream AS306 (also DoD); 0 downstream customers; RIPEstat observed_neighbours = 1; first routed 2009-02-27 (55.74.0.0/16), last seen 2026-06-26T16:00:00 UTC [Confirmed for peer/cone/dates] — RIPEstat routing-status (resource=AS335), ipinfo.io/AS335. Upstream ASN identity beyond AS306 not separately resolvable from RDAP/RIPEstat [Unknown]

RPKI

not directly confirmed for AS335; DoD ASNs broadly show low/incomplete ROA coverage, consistent with the federal government's gradual RPKI adoption — routing-hygiene observation, not an abuse signal [Likely] — bgp.he.net/AS27064, arin.net/resources/manage/rpki, rpki-monitor.antd.nist.gov

Peering policy

none public — no PeeringDB entry (peeringdb.com/asn/335 returns 404); DISN connectivity governed by the DoD DISN Connection Process Guide under DoDI 8010.01 [Confirmed] — peeringdb.com/asn/335, dl.dod.cyber.mil DISN CPG

Notable usage

part of the DoD DISN — the department's global classified/unclassified voice, video, and data transport network for warfighters, coalition, and mission partners; originates historic DoD 55.x.x.x space [Confirmed] — disa.mil, bgp.tools/as/335, ipinfo.io/AS335

Related ASNs

AS306 (sole peer/upstream, also DoD, same DNIC-ASBLK-00306-00371 block) [Confirmed] — ipinfo.io/AS335, ARIN RDAP

AS rank / customer cone

Unknown — CAIDA AS Rank API returned HTTP 502 at query time; no value obtainable this pass [Unknown] — api.asrank.caida.org (502)

Block

DNIC-ASBLK-00306-00371 (block handle AS306, spanning ASNs 306–371; AS335 falls within this DoD-reserved range) [Confirmed] — ARIN RDAP autnum/335

Currently announced

active as of the last RIS snapshot 2026-06-26; the as-overview "announced: false" is a 2026-06-28 snapshot-boundary artifact, not a withdrawal [Likely] — RIPEstat as-overview vs announced-prefixes (resource=AS335)

Analyst note

Encountered as a low-profile legacy DoD stub ASN within an early-allocated DoD block. WHOIS/RDAP resolves to the DoD via DISA; single-peer stub with stable but minimal internet visibility. Clean, no abuse signal. The "APA" designation referenced in one research source does not appear in authoritative records and is treated as unverified. CAIDA AS Rank unavailable (HTTP 502); as_rank left null.