AS272

AS272 is a legacy autonomous system number registered under ARIN to "Headquarters, USAISC" — the U.S. Army Information Systems Command — and named CTNOSC-ASN-272 after the CONUS Theater Network Operations and Security Center at Fort Huachuca, Arizona. It is a U.S. Department of Defense / U.S. Army government network, and its organizational lineage is the main triage point: USAISC was inactivated in 1996, and the successor operator at the same Fort Huachuca location is NETCOM (U.S. Army Network Enterprise Technology Command), subordinate to U.S. Army Cyber Command; the CTNOSC function itself merged into the 2d Regional Cyber Center under 7th Signal Command (Theater) in October 2013. The ARIN record was last changed in 2012 and has not been updated to reflect those successions. The second triage point is that AS272 is effectively dormant today: RIPEstat reports it as not announced, with zero IPv4 and zero IPv6 prefixes, zero RIS peers seeing it (0/327 v4, 0/322 v6), and zero observed neighbours. bgp.he.net confirms the AS has not been visible in the global routing table since 2022-12-07 (last prefix 158.9.17.0/24); first recorded routing activity was 2000-08-30 (199.123.85.0/24). Its sole historical BGP peer was AS367 (U.S. Department of Defense). RPKI cannot be assessed — no active originations, hence no ROAs. No notable public abuse signal was found as of June 2026: AS272 is absent from Spamhaus ASN-DROP and from NANOG archives; the only security-adjacent annotation is Hurricane Electric's bogon flag on two historically originated, now-withdrawn military prefixes (158.9.17.0/24, 207.133.195.0/24), which reflects legacy address space rather than active malicious routing. Administrative, technical, and abuse contact is handled by DISA (Defense Information Systems Agency), Columbus, OH. CAIDA AS Rank was unavailable (HTTP 502), so AS rank and customer cone are Unknown.

Operator

Headquarters, USAISC (U.S. Army Information Systems Command); ARIN org handle HEADQU-3. USAISC was inactivated in 1996; successor operator at the same location is NETCOM (U.S. Army Network Enterprise Technology Command)

[Confirmed] — ARIN RDAP, en.wikipedia.org/wiki/Army_Network_Enterprise_Technology_Command

Country / RIR

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

Allocated

1989-02-27 (ARIN RDAP autnum top-level registration event, NOT an IEEE date — IEEE publishes no ASN registration dates); last changed 2012-05-25 [Confirmed] — ARIN RDAP autnum top-level events

Org status

U.S. federal government / U.S. Army entity. USAISC (ARIN registrant) inactivated 1996; successor operational entity is NETCOM at Fort Huachuca, subordinate to U.S. Army Cyber Command [Confirmed] — ARIN RDAP, en.wikipedia.org/wiki/Army_Network_Enterprise_Technology_Command

Contacts

disa.columbus.ns.mbx.arin-registrations@mail.mil; +1-844-347-2457 ext 2 (DISA registration team, ARIN handle REGIS10-ARIN); registrant address NETC-ANC CONUS TNOSC, Fort Huachuca, AZ 85613 [Confirmed] — RIPEstat abuse-contact-finder, ARIN RDAP

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-21 — not in Spamhaus ASN-DROP, AbuseIPDB, or NANOG archives. Only flag is Hurricane Electric's bogon annotation on two historically originated, now-withdrawn prefixes (158.9.17.0/24, 207.133.195.0/24) with no RPKI coverage — legacy military space, not active malicious routing

Network & routing

Network type

U.S. DoD / U.S. Army military government network; AS272 is legacy/inactive. ASN name CTNOSC-ASN-272 refers to the CONUS Theater Network Operations and Security Center, which merged into the 2d Regional Cyber Center in 2013 [Confirmed] — ipinfo.io/AS272, army.mil/article/114105

Size

dormant — 0 IPv4 prefixes / 0 IPv4 addresses and 0 IPv6 prefixes; 0 observed neighbours [Confirmed]; AS rank and customer cone Unknown (CAIDA HTTP 502) [Unknown] — RIPEstat routing-status / bgp.he.net (2026-06)

Routing/peering

NOT announced — 0 RIS peers seeing it (0/327 v4, 0/322 v6); not visible in the global routing table since 2022-12-07 (last prefix 158.9.17.0/24); first seen 2000-08-30 (199.123.85.0/24) [Confirmed]. Sole historical upstream/peer was AS367 (U.S. Department of Defense)

[Likely] — RIPEstat routing-status, bgp.he.net/AS272

RPKI

not assessable — AS272 announces no prefixes, so there are no ROAs to validate; bgp.he.net shows 0 RPKI-valid and 0 RPKI-invalid origins [Confirmed] — bgp.he.net/AS272, RIPEstat rpki-validation (skipped, no announced prefix)

Peering policy

Unknown — no PeeringDB entry for AS272 (404), no public peering policy page; no active BGP routing [Unknown] — peeringdb.com/asn/272

Notable usage

AS272 was allocated to CTNOSC, a U.S. Army unit at Fort Huachuca, AZ responsible for CONUS theater network operations and security. CTNOSC merged in October 2013 into the 2d Regional Cyber Center under 7th Signal Command (Theater). Parent command NETCOM operates the Army's share of the DoD Information Network (DoDIN). The ASN appears retired/inactive since at least the 2013 reorganization

[Likely] — army.mil/article/114105, army.mil/Netcom

Related ASNs

AS367 (U.S. Department of Defense) — sole historical BGP peer [Likely] — bgp.he.net/AS272

Analyst note

Dormant/legacy U.S. military ASN. WHOIS resolves to an inactivated entity (USAISC); current operator is NETCOM and the CTNOSC function is now the 2d Regional Cyber Center. Clean, inactive ASN with no current routing.