AS254

AS254 is a legacy 16-bit autonomous system number registered under ARIN on 1988-11-11 — one of the earliest ASN allocations on record — to Attachmate Corp. (ARIN registrant handle ATTACH-1-Z, Seattle, WA), with the ASN name field now reading "OPENTEXT." The triage point for AS254 is its ownership chain rather than its routing scale: Attachmate Corporation, a terminal-emulation software vendor founded in 1982, merged into The Attachmate Group in 2005, which Micro Focus International acquired in 2014, and which OpenText Corporation in turn acquired in January 2023. The live NOC/admin contacts now all use @opentext.com addresses (IT Network Team, 515 Post Oak Blvd., Suite 1200, Houston, TX), confirming OpenText is the de-facto current operator while the registrant entity of record still reads "Attachmate Corp." Operationally it is a small, closed corporate stub AS: CAIDA reports zero customers, zero peers, and 3 upstream providers, with a customer cone of just itself (16 prefixes, 6,400 addresses). RIPEstat shows 9 IPv4 prefixes (~4,352 addresses) and one IPv6 /48 currently announced across legacy blocks inherited from Attachmate, Micro Focus, and Borland Software. CAIDA AS rank is ~19,469. No RPKI ROA coverage was confirmed, and no notable public abuse signal was found as of June 2026 — not in Spamhaus DROP/ASN-DROP, CleanTalk, AbuseIPDB, Emerging Threats/Firehol, or NANOG archives — consistent with a low-abuse profile for a 35-year-registered corporate ASN.

Operator

Attachmate Corp. (ARIN registrant handle ATTACH-1-Z, 705 5th Avenue South, Suite 1000, Seattle, WA 98104); de-facto operator OpenText Corporation post-acquisition (contacts @opentext.com) [Confirmed] — ARIN RDAP autnum/254

Country / RIR

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

Allocated

1988-11-11 (ARIN registry date, top-level autnum registration event — a first-party RIR fact, NOT an IEEE date); last changed 2024-04-09 [Confirmed] — ARIN RDAP autnum top-level events

Org status

OpenText Corporation (NASDAQ/TSX: OTEX) is the current controller via the acquisition chain Attachmate → The Attachmate Group (2005) → Micro Focus (2014) → OpenText (January 2023, ~$5.8–6B) [Confirmed] — en.wikipedia.org/wiki/Attachmate; theregister.com; OpenText press release

Contacts

IT Network Team, 515 Post Oak Blvd., Suite 1200, Houston, TX 77027; +1-713-548-1700 (corporate office line); the abuse/NOC role resolves to four individual @opentext.com mailboxes, withheld here — consult the ARIN RDAP record directly [Confirmed] — ARIN RDAP; RIPEstat abuse-contact-finder

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-20 — not in Spamhaus DROP/ASN-DROP, CleanTalk, AbuseIPDB, Emerging Threats/Firehol, or NANOG archives; long-registered corporate ASN

Network & routing

Network type

corporate/enterprise stub AS — not a public ISP or transit provider; closed internal network [Confirmed] — CAIDA AS Rank; bgp.tools/as/254; bgp.he.net/AS254

Size

9 IPv4 prefixes (~4,352 addresses announced) and 1 IPv6 prefix (2620:113:8082::/48); CAIDA customer cone = 16 prefixes / 6,400 addresses (singleton, 1 ASN) [Confirmed] — RIPEstat routing-status / announced-prefixes; CAIDA AS Rank

Routing/peering

3 upstream providers, 0 peers, 0 customers (CAIDA asnDegree); 2 observed BGP neighbours (RIPEstat); RIS visibility 327/327 v4 and 324/324 v6; no PeeringDB entry; observed upstreams include AS9498 (Bharti Airtel), AS4755 (Tata Communications), AS2686 (AT&T Enterprises) [Confirmed for CAIDA/RIPEstat counts; Likely for the specific upstream identities via bgp.tools/bgp.he.net]

RPKI

Unknown — no ROA validation confirmed (RIPEstat rpki-validation skipped, no prefix supplied); bgp.tools shows no RPKI-validated prefixes [Likely]

Notable usage

announces legacy blocks tied to the Attachmate/Micro Focus lineage — 149.82.52.0/22 and 149.82.80.0/22 (Attachmate), 140.236.116.0/22 and 192.31.114.0/24 (Micro Focus), 143.186.108.0/22 (Borland Software), plus IPv6 2620:113:8082::/48; bgp.he.net notes bogon announcements [Confirmed for prefixes via RIPEstat; Likely for per-block company attribution via whois.ipip.net]

Related ASNs

AS16751 (OpenText's primary, larger ASN); AS254 is the legacy Attachmate/TWG holdover [Likely] — bgp.tools/as/16751

ASN name

OPENTEXT (ARIN name field; older third-party DBs show legacy ASName TWG-NET-AS) [Confirmed] — ARIN RDAP; bgp.tools/as/254

Analyst note

Encountered as a small, active-but-closed corporate stub ASN with a notable ownership chain. WHOIS registrant reads "Attachmate Corp." but live operation is OpenText. allocated_date 1988-11-11 is the top-level autnum registration; entity-level dates (ATTACH-1-Z 2018-12-19, INT1-ARIN 2007-05-24) are org/contact record dates and excluded.