AS155

AS155 is a legacy, very-low-number Autonomous System registered under ARIN to the United States Department of Defense (DoD), administered through the DoD Network Information Center (DNIC) and operated by the Defense Information Systems Agency (DISA) out of Columbus/Whitehall, Ohio. Its ARIN handle is DNIC-AS-00155 and the registrant org is USDDD; the ARIN autnum record carries a registration date of 1988-01-11, placing it among the earliest ASNs issued in the early-Internet era. Unlike its dormant DoD sibling AS147, AS155 is live in the public routing table: as of mid-2026 it originates two IPv4 /24 prefixes — 131.77.247.0/24 and 205.64.0.0/24 (512 addresses total) — and no IPv6. Its public visibility is near-total, with 326 of 327 IPv4 RIS route collectors seeing it (0 of 319 for IPv6), so it is effectively globally reachable. Topologically it is a stub/leaf network: RIPEstat reports a single observed neighbour, and both bgp.tools and bgp.he.net identify that sole upstream as AS27064 (also a DoD/DISA ASN), consistent with connectivity over DoD infrastructure rather than civilian transit. CAIDA places it at AS-rank ~79,459 (clique member: false); its customer cone could not be confirmed from the available CAIDA payload. The ARIN record was last changed 2025-09-12. No RPKI ROA coverage was observed for either prefix, and bgp.he.net applies a "bogon" flag that reflects this space's pre-CIDR DoD legacy classification rather than a current unroutable status. No notable public abuse signal was found as of 2026-06-16: AS155 is absent from Spamhaus DROP/ASN-DROP, CleanTalk, and community ASN blocklists, and the DoD NIC operator carries a Scamalytics fraud score of 0/100.

Operator

United States Department of Defense (DoD), via the DoD Network Information Center (DNIC), operated by DISA; ARIN OrgId USDDD [Confirmed] — ARIN RDAP (rdap.arin.net/registry/autnum/155)

AS name / handle

DNIC-AS-00155 (RDAP autnum handle AS155) [Confirmed] — ARIN RDAP; bgp.tools/as/155; ipinfo.io/AS155

Country / RIR

US, ARIN [Confirmed] — ARIN RDAP

Org status

active ARIN allocation (autnum status "active"); registered, maintained, and announcing 2 prefixes [Confirmed] — ARIN RDAP, bgp.tools/as/155

Website

no dedicated public site for AS155; DoD/DISA at disa.mil [Likely] — disa.mil

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-16; absent from Spamhaus DROP/ASN-DROP, CleanTalk ASN list, and the C0nw0nk community ASN blocklist; DoD NIC operator Scamalytics fraud score 0/100 (AbuseIPDB and AlienVault OTX could not be directly queried — 403/404 — so absence there is reported conservatively)

Network & routing

Network type

U.S. federal government / military network; government stub AS (single-homed, non-transit), active in the public routing table [Confirmed] — bgp.tools/as/155, ipinfo.io/AS155

Routing

2 IPv4 prefixes announced — 131.77.247.0/24 (DoD NIC) and 205.64.0.0/24 (Navy NIC), 512 addresses total; 0 IPv6 [Confirmed] — bgp.he.net/AS155, bgp.tools/as/155, RIPEstat announced-prefixes

Upstream / peering

sole observed neighbour and upstream is AS27064 (DoD / DISA), per RIPEstat (1 neighbour) corroborated by bgp.he.net and bgp.tools; likely routed over DoD infrastructure [Confirmed for AS27064] — bgp.he.net/AS155, bgp.tools/as/155, RIPEstat routing-status; no AS155-specific public peering policy found (PeeringDB lists the DoD org/17705 but no network record for AS155)

[Unknown] — peeringdb.com/org/17705

RPKI

no ROA coverage observed for either prefix; bgp.he.net flags no RPKI-validated origins (RIPEstat rpki-validation skipped — no prefix supplied) [Likely] — bgp.he.net/AS155

Notable usage

one of the earliest-registered ASNs (Jan 1988). DISA's NIC unit manages unclassified DoD IP allocation and .mil hostname registration; the 205.64.0.0/24 prefix is associated with the Navy NIC. (DISA's NIC is also commonly cited as operating G.root-servers.net, though that is an organizational, not an AS155-routing, fact.)

[Likely] — icannwiki.org/Defense_Information_Systems_Agency, ipinfo.io/AS155

Registered

ARIN ASN registration event 1988-01-11 (this is the ARIN database registration date, NOT an IEEE or IANA date) [Confirmed] — ARIN RDAP

Last changed (ARIN)

2025-09-12 (autnum "last changed" event) [Confirmed] — ARIN RDAP

Visibility

326 of 327 IPv4 RIS peers (~99.7%); 0 of 319 IPv6 RIS peers (query 2026-06-15) [Confirmed] — RIPEstat routing-status

Connectivity (CAIDA)

AS-rank ~79,459; clique member false [Confirmed]; customer cone not confirmed (CAIDA payload truncated before cone fields) [Unknown] — CAIDA AS-rank

bgp.he.net "bogon" flag

AS155 is flagged as announcing bogons — a known classification applied to historical pre-CIDR DoD address space; noted with context, it does not by itself imply the prefixes are unroutable (both are globally visible per RIPEstat) [Confirmed for the flag; interpretation Likely] — bgp.he.net/AS155

Technical / abuse contact

Network DoD, handle MIL-HSTMST-ARIN (NOC/Technical/Abuse), disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil, +1-844-347-2457 ext.2; registration contact REGIS10-ARIN, disa.columbus.ns.mbx.arin-registrations@mail.mil [Confirmed] — ARIN RDAP

Registrant address

3990 E. Broad Street, Columbus, OH 43218, US (org); DISA-Columbus, 300 North James Road, Whitehall, OH 43213 (technical/NOC) [Confirmed] — ARIN RDAP

Analyst note

a clean, active legacy government ASN — WHOIS resolves to DoD/DISA via ARIN (OrgId USDDD). Stub topology with one upstream (AS27064, another DoD AS). Distinguish from sibling AS147, which is dormant (0 prefixes); AS155 actively announces 2 /24s. Customer cone and RPKI posture left Unknown/Likely where sources were truncated or not directly readable.