AS6

AS6 is a legacy single-digit allocation that today is registered under ARIN to ATOS IT Solutions and Services, Inc., the corporate successor to its historical holder. The BULL-HN handle refers to Bull HN Information Systems Inc., the U.S. arm of French computer maker Groupe Bull, itself the inheritor of Honeywell's computer business ("Bull HN" = Bull-Honeywell-NEC, named 1989), with a lineage running through GCOS mainframes and Multics-era systems. Groupe Bull was acquired by Atos in 2014, and the ASN's registry org now reflects that successor chain rather than "Bull HN" directly. It actively announces about 34 IPv4 prefixes and one IPv6 prefix (~134,000 IPv4 addresses), with seven upstreams and an "announces bogons" flag at Hurricane Electric. For triage this is an old enterprise allocation tied to legacy Bull/Honeywell IT services now under Atos; state the current holder as ATOS and treat "Bull HN" as the historical handle. The 1984-02-02 ARIN RegDate is among the earliest. Prefix counts and RPKI-invalid counts varied between sources and snapshots (one HE snapshot showed zero invalid, an earlier one showed three), so those are reported as varying by date. No notable public abuse signal was found as of June 2026.

Operator (current)

ATOS IT Solutions and Services, Inc. (ARIN OrgId ATOS-Z, Phoenix, AZ; successor to Bull HN) [Confirmed] — ARIN RDAP

Country / RIR

US, ARIN [Confirmed]

Allocated

ARIN ASN RegDate 1984-02-02 (among the earliest; Updated 2021-01-21); original assignment may predate this [Confirmed for shown date]

Org status

active; acquired — successor holder ATOS IT Solutions and Services, Inc.

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-07; legacy corporate network. Bogon flag noted neutrally — bgp.he.net

Network & routing

Network type

enterprise / legacy (corporate) [Confirmed]

Size

~34 IPv4 prefixes, 1 IPv6 (~134,656 IPv4 addrs); secondary/dated source (BigDataCloud) showed ~65 IPv4 prefixes / ~125,440 addrs — figures vary by source/date — bgp.he.net (2026-06)

Routing/peering

1 IX; 7 upstreams; actively announcing; HE flags "announces bogons"; RPKI varied by snapshot (HE: 0 invalid in one June-2026 snapshot; 3 invalid in an earlier one) — bgp.he.net

Notable usage

[historical] BULL-HN = Bull HN Information Systems, US arm of Groupe Bull (inheritor of Honeywell's computer business; GCOS/Multics lineage). [current] Groupe Bull acquired by Atos (2014); ASN registered to ATOS IT Solutions and Services, Inc. — atos.net

Related ASNs

Atos/Eviden operates many ASNs globally; no specific sibling confirmed

Analyst note

An old enterprise allocation tied to legacy Bull/Honeywell IT services now under Atos; state current holder as ATOS (Confirmed, ARIN), with "Bull HN" the historical handle. Watch the variable RPKI-invalid count between snapshots.