AS228

AS228 is a U.S. military autonomous system number registered under ARIN to the United States Department of Defense, administered through the DoD Network Information Center (DNIC) by DISA-Columbus in Whitehall, Ohio. Its IPv4 space is labeled "Headquarters, USAISC" — the U.S. Army Information Systems Command, the Army automation and communications command established in 1984 at Fort Huachuca, Arizona and later realigned into the Network Enterprise Technology Command (NETCOM) — while its IPv6 prefix is designated for High Performance Computing. Unlike its dormant sibling AS227, AS228 is actively present in global routing. It originates four IPv4 /21 blocks in the 147.241.0.0/16 range (147.241.48.0/21, 147.241.64.0/21, 147.241.136.0/21, 147.241.144.0/21 — 8,192 addresses total) and one IPv6 /48 (2001:480:253::/48), with near-universal RIS peer visibility (326/327 v4 peers and 323/324 v6 peers, about 99.7% each). It is a single-homed stub: CAIDA records exactly one upstream and zero peers or downstream customers, a customer cone of one ASN, and a global AS rank of 18,582; the sole observed transit relationship is AS668 (DoD High Performance Computing / Defense Research and Engineering Network, DREN). The earliest routing CAIDA/RIS recorded for the ASN was 192.48.213.0/24 in August 2005 (no longer active); the current prefixes were last seen on 2026-06-20. RPKI posture could not be assessed in this pass because no specific prefix was supplied to the validation endpoint. No notable public abuse signal was found as of June 2026 — not in Spamhaus, AbuseIPDB, NANOG archives, or general threat feeds — consistent with a closed DoD stub network with no commercial hosting or transit footprint, though several feeds returned access errors rather than explicit clean results. AS228 also appears in RFCs 2280 and 2622 purely as a routing-policy example, not as evidence of operational significance.

Operator

United States Department of Defense (DoD), administered via the DoD Network Information Center (DNIC) by DISA-Columbus; ARIN org handle USDDD, network handle DNIC-AS-00228; IPv4 space labeled "Headquarters, USAISC" (U.S. Army Information Systems Command)

[Confirmed] — ARIN RDAP autnum/228, whois.arin.net/rest/asn/AS228, ipapi.is/asn/228.html

Country / RIR

US, ARIN [Confirmed] — RIPEstat abuse-contact-finder (authoritative_rir: arin), ARIN RDAP autnum/228

Allocated

1988-09-08 (ARIN RDAP autnum top-level registration event — a first-party ARIN registry fact, NOT an IEEE date; IEEE publishes no ASN registration dates); last changed 2025-09-12 [Confirmed] — ARIN RDAP autnum/228 top-level events

Org status

Active — U.S. federal government agency (DoD); ARIN registration active as of last update 2025-09-12 [Confirmed] — ARIN RDAP autnum/228

Contacts

abuse/hostmaster disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil (Network DoD, handle MIL-HSTMST-ARIN); phone +1-844-347-2457 ext 2 [Confirmed] — ARIN RDAP autnum/228, RIPEstat abuse-contact-finder

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-19 — not in Spamhaus, AbuseIPDB, Barracuda Central, NANOG archives, GreyNoise, Shodan, or Censys; no BGP hijack/route-leak incidents attributed to AS228; structurally low-risk as a closed DoD stub with no commercial hosting/transit [Likely — several feeds (Spamhaus, AbuseIPDB ASN view, FraudGuard) returned access errors rather than explicit clean-bill results; no positive abuse evidence in any reachable source] — abuseipdb.com, spamhaus.org, seclists.org/nanog, bgp.tools/as/228

Network & routing

Network type

U.S. federal government / military (DoD) network; government stub AS — not a commercial ISP [Confirmed] — ARIN RDAP autnum/228, ipapi.is/asn/228.html

Size

active — 4 IPv4 /21 prefixes (147.241.48.0/21, 147.241.64.0/21, 147.241.136.0/21, 147.241.144.0/21; 8,192 addresses total) and 1 IPv6 /48 (2001:480:253::/48); customer cone = 1 ASN (itself), 4 prefixes, 8,192 addresses [Confirmed] — RIPEstat announced-prefixes / routing-status, CAIDA AS Rank

Routing/peering

announced with near-universal visibility — 326/327 RIS peers v4 (~99.7%) and 323/324 v6 (~99.7%); single-homed stub via one upstream (AS668, DoD HPC/DREN); CAIDA degree total 1 (customer 0, peer 0, provider 1); CAIDA clique member = true

[Confirmed] — RIPEstat routing-status, CAIDA AS Rank, bgp.he.net/AS228, bgp.tools/as/228

Peering policy

Unknown — no public peering policy published for AS228; not present in PeeringDB as its own record; DoD maintains a closed/government-only posture with no public-exchange participation, transiting via AS668 [Likely] — peeringdb.com/org/17705, bgp.he.net/AS228, bgp.tools/as/228

RPKI

not assessed this pass — RIPEstat rpki-validation requires a specific prefix and none was supplied; posture not determinable from the data collected [Unknown] — RIPEstat (rpki-validation skipped: no --prefix supplied)

Notable usage

IPv4 space labeled "Headquarters, USAISC" (U.S. Army Information Systems Command; mission later under NETCOM) and the IPv6 prefix designated "High Performance Computing"; earliest RIS-observed origination was 192.48.213.0/24 on 2005-08-20 (no longer active); current prefixes last seen 2026-06-20; AS228 has been noted announcing bogons; appears in RFC 2280 / RFC 2622 only as a routing-policy example [Confirmed for current prefixes/usage; Likely for bogon note and historical first-seen per third-party DB] — bgp.he.net/AS228, bgp.tools/as/228, ipapi.is/asn/228.html, RFC 2622, RIPEstat routing-status

Related ASNs

AS668 (DoD High Performance Computing / DREN) — sole observed upstream/transit [Confirmed] — bgp.he.net/AS228, bgp.tools/as/228, CAIDA AS Rank

Geo footprint

United States; CAIDA coordinates ~33.87N, 96.29W (North Texas region); registrant org at 3990 E. Broad Street, Columbus, OH 43218; NOC/technical at DISA-Columbus, 300 North James Road, Whitehall, OH 43213 [Likely for coordinates; Confirmed for addresses] — CAIDA AS Rank, ARIN RDAP autnum/228

Historical context

IPv4 space labeled for USAISC; A5 records a historical association with the Navy Regional Data Automation Center (NARDAC), Washington D.C.; administrative control now sits with DISA-Columbus [Likely — single-source historical note] — ip2location.com/as228, ntrl.ntis.gov (ADA380993)

Analyst note

An active DoD government stub ASN. The allocated_date (1988-09-08) is the autnum TOP-LEVEL registration event — the entity-level dates (MIL-HSTMST-ARIN 1993-05-26, REGIS10-ARIN 2009-06-24) are decoys and were not used. The RDAP fetch in A1 timed out, but A2/A3/A4 independently confirmed RDAP fields, so the record is corroborated. Distinct from dormant sibling AS227: AS228 is actively routed.