AS600

AS600 (OARNET-AS) is the autonomous system number of OARnet, the Ohio Academic Resources Network, a division of the Ohio Department of Higher Education and a member of the Ohio Technology Consortium (OH-TECH), alongside the Ohio Supercomputer Center and OhioLINK. Registered under ARIN, the autnum's top-level RDAP record carries a registration event dated March 11, 1990, making it one of the older three-digit ASNs still actively routing, with a last-changed event of November 6, 2019. OARnet operates a statewide fiber-optic backbone spanning roughly 5,500 miles that connects Ohio's higher-education institutions, K-12 schools, state and local government, healthcare organizations, and research bodies, and it serves as Ohio's official Internet2 connector with dual 100 Gbps links in Cleveland and Cincinnati. Routing data shows AS600 actively announcing 81 IPv4 prefixes and 2 IPv6 prefixes, with full visibility across RIPE RIS's peer set (325/325 IPv4, 321/321 IPv6), reflecting a well-connected, non-dormant network rather than a legacy holder. Peering runs through two distinct programs — a discretionary Commercial Network Peers track (Apple, Microsoft, Google, Equinix, Cologix) and a Research Network Peers track (Merit, Kinber, OSHEAN, the Pittsburgh Supercomputing Center, and OmniPoP-linked universities including Indiana, Illinois/NCSA, Northwestern, Chicago, Iowa, and Minnesota) — with no formally published traffic-ratio or PeeringDB-style admission criteria; OARnet directs prospective peers to contact its client-services team directly. No public abuse or blocklist signal was found for the ASN as of mid-July 2026: a live fetch of the Spamhaus ASN-DROP list confirmed AS600's continued absence, and no NANOG-archive incident threads or threat-feed hits were located.

Operator

OARnet (Ohio Academic Resources Network), a division of the Ohio Department of Higher Education / Ohio Technology Consortium (OH-TECH) [Confirmed] — ARIN RDAP (rdap.arin.net/registry/autnum/600), oar.net/content/explore_oarnet

Country / RIR

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

Allocated

1990-03-11 — ARIN RDAP autnum TOP-LEVEL registration event (not the entity-level OAR-Z/NOC2069-ARIN events, which are 2010-01-04 and 2006-03-08 respectively and were correctly excluded); last changed 2019-11-06 [Confirmed] — ARIN RDAP autnum top-level events

Org status

active (RDAP status: active); state-government-affiliated entity (division of the Ohio Department of Higher Education, OH-TECH member), not a commercial ISP [Confirmed] — ARIN RDAP, oar.net/content/explore_oarnet

Contacts

support@oar.net; +1-800-627-6420; HQ 1224 Kinnear Rd, Columbus, OH 43212 [Confirmed] — ARIN RDAP (NOC2069-ARIN), RIPEstat abuse-contact-finder

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-07-16; confirmed absent from a live fetch of the Spamhaus ASN-DROP list; no NANOG incident threads or threat-feed hits located

Network & routing

Network type

state research-and-education network (REN) and state agency network; Ohio's official Internet2 connector [Confirmed] — oar.net/content/explore_oarnet, oar.net/service_types/network_peering

Size

81 IPv4 prefixes / ~994,304 IPv4 address estimate; 2 IPv6 prefixes / ~131,072 IPv6 /48-equivalents [Confirmed] — RIPEstat routing-status / announced-prefixes for AS600

Routing/peering

full RIS visibility (325/325 IPv4 RIS peers, 321/321 IPv6); first seen announcing 2000-08-18 (199.74.236.0/24) [Confirmed] — RIPEstat routing-status. ~2 upstreams (AS3356 Lumen/Level 3, AS7018 AT&T) and ~94 sampled peers [Likely, secondary sources] — bgp.he.net/AS600, bgp.tools/as/600

Peering policy

split into Commercial Network Peers (Apple, Microsoft, Cologix, Google, Equinix) and Research Network Peers (Merit, Kinber, OSHEAN, Pittsburgh Supercomputing Center, OmniPoP institutions); discretionary/case-by-case, no published ratio criteria

[Confirmed] — oar.net/services/network_peering/commercial_network_peers, oar.net/services/network_peering/research_network_peers

RPKI

not assessed at ASN level — RIPEstat rpki-validation requires a per-prefix query, none run here [Unknown] — RIPEstat rpki-validation endpoint note

Notable usage

Ohio's Internet2 connector with dual 100 Gbps links in Cleveland and Cincinnati; 10 Gbps link to NASA Glenn Research Center (since 2013); high-speed link to Wright-Patterson AFB; Big Ten/OmniPoP research-network interconnects; ~5,500-mile statewide fiber backbone

[Confirmed] — oar.net/services/network_peering/research_network_peers, oar.net/content/explore_oarnet

Related ASNs

none independently verified in this pass [Unknown]

Analyst note

A third-party ASN-lookup aggregator snippet also surfaced 1990-03-11 as the registration date, independently corroborating the ARIN RDAP top-level event used for allocated_date. Active, well-peered state REN — not a dormant/legacy ASN.