AS543

AS543 is a long-standing autonomous system number registered under ARIN, with a top-level autnum registration event dated 1989-10-17 and a last-changed date of 2024-06-07. The registrant is HP Inc. (ARIN org handle HPINC), the Palo Alto, California-based personal-computer and printing hardware company traded on the NYSE as HPQ, headquartered at 1501 Page Mill Rd, Palo Alto, CA 94304. The AS-name HP-POLY reflects the folding-in of Poly (the former Plantronics/Polycom brand, acquired by HP in 2022) into HP's corporate ASN naming; notably, the ASN's own registration predates that acquisition by more than three decades, indicating an older HP-held number that was simply renamed rather than newly allocated. AS543 functions as an enterprise/corporate network rather than a public ISP or transit carrier: it currently announces five IPv4 prefixes (5,120 addresses) across two upstream/peer relationships — Lumen (AS3356, formerly Level 3) and Masergy Communications (AS19855) — with no IPv6 announcements and no IXP presence recorded by CAIDA. A naming lag was observed: HP's PeeringDB network record for AS543 is still filed under "HP Polycom" beneath the older PeeringDB org "Hewlett-Packard Company," while ARIN's org record uses the current legal name "HP Inc." No RPKI ROAs cover its announced space (none valid or invalid), and no public abuse signal, hijack, or route-leak incident naming AS543 was found in Spamhaus, AbuseIPDB, or NANOG archives as of this research date.

Operator

HP Inc. (ARIN org handle HPINC); PeeringDB net record still labeled "HP Polycom" under org "Hewlett-Packard Company" (org id 18149) — a naming lag [Confirmed for ARIN legal name; Likely for the PeeringDB-lag explanation] — https://whois.arin.net/rest/asn/AS543, https://www.peeringdb.com/api/net?asn=543

Country / RIR

US, ARIN [Confirmed] — https://rdap.arin.net/registry/autnum/543

Allocated

1989-10-17 (ARIN autnum top-level registration event); last changed 2024-06-07 [Confirmed] — https://rdap.arin.net/registry/autnum/543 (nested entity-level dates for org HPINC and poc HIA8-ARIN, e.g. 2016-08-12 and 2016-09-16, are explicitly excluded as decoys, not the ASN's own allocation date)

Org status

active, publicly traded (NYSE: HPQ); HQ 1501 Page Mill Rd, Palo Alto, CA 94304; ARIN org record last updated 2024-06-07 [Confirmed] — https://whois.arin.net/rest/org/HPINC, https://investor.hp.com/resources/contact-ir/default.aspx

Contacts

IPAdmin@hp.com — the role mailbox of HP's "HP Inc IP Admin" group POC (HIA8-ARIN); an individual staff mailbox also listed on that record is not reproduced here [Confirmed] — https://stat.ripe.net/AS543

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal, hijack, or route-leak found as of 2026-07-11 across Spamhaus DROP/ASN-DROP, AbuseIPDB, and NANOG archives; direct live queries to check.spamhaus.org (403) and abuseipdb.com/asn/543 (404) were blocked, so this rests on search-engine coverage rather than a direct registry response [Likely] — https://www.spamhaus.org/blocklists/do-not-route-or-peer/, https://nanog.org/stories/articles/a-brief-history-of-the-internets-biggest-bgp-incidents/

Network & routing

Network type

enterprise/corporate network belonging to HP Inc.; not a public ISP or transit carrier. No dedicated HP-authored network-operations page was found describing AS543 specifically [Likely] — https://www.hp.com/us-en/hp-information.html, https://www.peeringdb.com/api/net?asn=543

Size

5 IPv4 prefixes announced / 5,120 addresses; 0 IPv6 prefixes; CAIDA customer cone reports numberAsns=1, numberPrefixes=7, numberAddresses=9472 (a different CAIDA-methodology snapshot that diverges from the live-announced count — both figures reported, not reconciled)

[Confirmed] — https://stat.ripe.net/AS543, CAIDA ASRank (embedded in provided canonical data)

Routing/peering

upstreams AS3356 (Lumen/Level 3 Parent, LLC) and AS19855 (Masergy Communications, Inc.); the same two ASNs appear as both upstream and peer entries with no distinct settlement-free peer set surfaced; CAIDA AS rank 17,648, clique member, degree total=3 (provider=3, customer=0, peer=0); RIPEstat observed_neighbours=2 (a minor cross-source discrepancy vs CAIDA's degree total=3, not reconciled)

[Confirmed/Likely] — https://bgp.he.net/AS543, https://bgp.tools/as/543

Peering policy

no peering-policy page found on hp.com/hpe.com/poly.com; PeeringDB (operator-submitted to a third party, not the operator's own site) lists policy general="Open", location not required, contracts not required [Unknown at operator-official level; Likely from PeeringDB] — https://www.peeringdb.com/api/net?asn=543

RPKI

no valid or invalid RPKI originations recorded for AS543's announced space (no ROAs); RIPEstat's rpki-validation endpoint requires a specific prefix and was not queryable at the ASN level [Confirmed] — https://bgp.he.net/AS543

Notable usage

not documented on any HP-owned page; the small announced footprint (5 prefixes, one AS in its customer cone) and Lumen/Masergy upstreams are third-party BGP-tool observations rather than operator statements [Unknown at operator-official level] — https://bgp.he.net/AS543, https://bgp.tools/as/543

Related ASNs

none identified in this research pass [Unknown]

Analyst note

AS-name HP-POLY reflects the 2022 HP/Poly (Plantronics/Polycom) acquisition folded into an ASN whose own registration predates it by over three decades (1989). PeeringDB still carries the older "HP Polycom" / "Hewlett-Packard Company" naming, while ARIN's org record ("HP Inc.") is the more current, authoritative source used here.