AS547

AS547 is a legacy autonomous system number registered under ARIN to International Business Machines Corporation (IBM), carrying the RIR-assigned name ASN-IBM-LEX. ARIN's RDAP record places the ASN's top-level registration event at 1989-11-03, with the object last updated 2020-10-12 — dating it to the earliest era of commercial Internet numbering, alongside other pre-1990s corporate allocations. The registrant contact traces to IBM's Research Triangle Park, North Carolina site, while the "LEX" component of the ASN name hints at a historical tie to IBM's Lexington, Kentucky operations, though the two locations were not reconciled by any source consulted. Today AS547 functions as a small, single-homed stub network: it announces exactly one IPv4 block, 170.225.223.0/24 (256 addresses), no IPv6 space, and is fully visible to all 325 RIPE RIS IPv4 peers. CAIDA's AS-rank data (rank 67700) shows a customer cone of just the ASN itself, one upstream provider, zero peers, and zero downstream customers — consistent with an internal corporate network rather than a transit or access ISP. No PeeringDB object, published peering policy, or documented current use case was found for AS547 specifically; IBM's other, cloud-facing ASNs (e.g. AS36351/SoftLayer) are separate registrations and were not conflated with this one. No abuse, hijack, or blocklist history was found across Spamhaus, Qrator, and NANOG archive searches, consistent with a quiet, long-tenured enterprise ASN.

Operator

International Business Machines Corporation (IBM), ARIN name ASN-IBM-LEX [Confirmed] — https://rdap.arin.net/registry/autnum/547

Country / RIR

US, ARIN [Confirmed] — https://rdap.arin.net/registry/autnum/547

Allocated

1989-11-03 (ARIN RDAP autnum top-level registration event, NOT an IEEE/OUI-style date); last changed 2020-10-12 [Confirmed — corroborated independently by A2, A3, and A5] — https://rdap.arin.net/registry/autnum/547

Org status

active; IBM legal identity corroborated via SEC 10-K filing (direct ibm.com/about and ibm.com/investor fetches returned HTTP 403, bot-blocked) [Confirmed] — https://www.sec.gov/Archives/edgar/data/51143/000005114325000015/ibm-20241231.htm

Website

https://www.ibm.com (corporate); direct fetch of ibm.com pages blocked (403), so identity was confirmed via SEC filing instead [Likely]

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal, blocklist listing, hijack, or route-leak found as of 2026-07-11 across Spamhaus, Qrator/radar.qrator.net, and NANOG/SecLists archive searches

Network & routing

Network type

legacy single-homed corporate/enterprise stub network, not a public transit or access ISP; the "LEX" name element suggests a historical Lexington, KY association, unreconciled against the RTP, NC registrant address [Likely] — https://rdap.arin.net/registry/autnum/547

Size / routing

1 IPv4 prefix announced (170.225.223.0/24, 256 addresses), 0 IPv6 prefixes; fully visible to 325/325 RIS IPv4 peers, 0/322 IPv6 peers [Confirmed] — https://stat.ripe.net/AS547

CAIDA topology

AS rank 67700; customer cone = 1 ASN / 1 prefix / 256 addresses (itself only); AS degree total 1 (0 customer, 0 peer, 1 provider) [Confirmed] — https://asrank.caida.org/asns/547

Upstreams/peers

1 observed neighbour per RIPEstat routing-status, consistent with CAIDA's single-provider topology; no named upstream/peer ASN identified in the data gathered [Unknown for specific ASN identity] — https://stat.ripe.net/AS547

Peering policy / PeeringDB

no PeeringDB network object exists for AS547 (API query for asn=547 returned 404); no IBM-published page documents a peering policy tied to this specific ASN [Unknown] — https://rdap.arin.net/registry/autnum/547

RPKI

not determined — the rpki-validation query in the source dataset was skipped for lack of a --prefix parameter; no ROA status was retrieved for 170.225.223.0/24 [Unknown]

Geo footprint

CAIDA reports a single coordinate (37.31, -122.00, US), read by the researcher as a generic Northern-California fallback rather than a precise site; actual registrant address is Research Triangle Park, NC [Likely] — https://asrank.caida.org/asns/547

Notable usage

not documented by any IBM-official source found; described in third-party community search results as tied to IBM's Lexington operations, but this was not corroborated by a citable IBM page [Unknown]

Related ASNs

none confirmed as directly related in the data gathered; IBM holds other, separately-registered ASNs for cloud infrastructure (e.g. AS36351/SoftLayer) that are distinct from AS547 [Likely] — https://rdap.arin.net/registry/autnum/547

Registrant contact

RAIN-ARIN, ipreg@us.ibm.com, 3039 Cornwallis Road, Research Triangle Park, NC 27709-2195, USA [Confirmed] — https://rdap.arin.net/registry/autnum/547

Analyst note

Encountered as a small, dormant-adjacent (single-prefix) legacy corporate ASN. Primary canonical RDAP fetch (A1) timed out but was successfully retried via fetch-canonical.mjs --max-bytes 0, which returned the full autnum object with unambiguous top-level registration/last-changed events, used here rather than decoy entity-level (org/poc) events.