AS75

AS75 is a legacy allocation registered under ARIN to Argonne National Laboratory (org ANL-13-Z, Argonne, IL), a major U.S. Department of Energy Office of Science national laboratory operated by UChicago Argonne LLC. RFC 1166 (1990) lists network 130.202 as "ARGONNE," and the same tech contact (Linda Winkler) still appears on the current ARIN record, showing continuity from the early-Internet era. The ASN is currently dormant in the global routing table: RIPEstat as-overview reports announced:false, and routing-status shows 0 IPv4 and 0 IPv6 prefixes with 0 of 327 IPv4 and 0 of 323 IPv6 RIS peers seeing any route and 0 observed neighbours. Its last announced prefix was the IPv6 block 2001:48d0:a000::/35, last seen on 2025-06-12, after which the network was withdrawn — so AS75 ceased visible routing around June 2025 and no single-IPv6 trace remains in current RIS visibility. The ARIN ASN RegDate is 1986-05-05 (the ANL-13-Z org RegDate of 2023-02-17 is a registry refresh). For triage this is a clean DOE national-lab/FFRDC network whose allocation remains registered and active even though its routing has gone dormant. No notable public abuse signal was found as of June 2026.

Operator

Argonne National Laboratory (ARIN OrgId ANL-13-Z, Argonne, IL; operated by UChicago Argonne LLC) [Confirmed] — ARIN RDAP

Country / RIR

US, ARIN [Confirmed]

Allocated

ARIN ASN RegDate 1986-05-05 (org ANL-13-Z RegDate 2023-02-17 is a registry refresh) [Confirmed]

Org status

active (registration); routing dormant

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-08; clean FFRDC network — bgp.tools

Network & routing

Network type

FFRDC (US DOE national laboratory) [Confirmed]

Size

dormant — 0 IPv4, 0 IPv6 prefixes announced; not visible in the global table (0/327 IPv4, 0/323 IPv6 RIS peers) [Confirmed] — RIPEstat routing-status (2026-06-19)

Routing/peering

not currently routed; ceased ~June 2025 (last seen 2001:48d0:a000::/35 on 2025-06-12); 0 observed neighbours; RPKI not applicable while withdrawn [Confirmed] — RIPEstat

Notable usage

Argonne — major DOE Office of Science national lab; RFC 1166 network 130.202 "ARGONNE," same tech contact (Linda Winkler) on the current ARIN record (continuity) — anl.gov

Related ASNs

DOE/ESnet-connected national-lab networks [Likely]

Analyst note

A DOE national-lab network whose routing has gone dormant — previously IPv6-only via SDSC (AS195), now withdrawn (last seen 2025-06-12); the ARIN allocation remains registered.