AS239

AS239 is a legacy autonomous system number registered under ARIN to the University of Toronto, one of Canada's largest research universities. Operated by the university's Information & Technology Services (ITS) department — specifically its Enterprise Infrastructure Solutions (EIS) / Enterprise Networking unit — the ASN carries the campus backbone, wireless networks (Campus WiFi and eduroam), and the institution's gateway to provincial and national research-and-education networks. Its registration is genuinely old: ARIN RDAP records an autnum top-level registration event of 1988-09-20, placing AS239 among the earliest-numbered ASNs still in active use, with a last-changed date of 2009-07-31. Operationally it is a single-homed stub network: every routing source consulted (RIPEstat, CAIDA AS Rank, bgp.he.net) agrees it announces 15 IPv4 prefixes (about 331,264 addresses, including 128.100.0.0/16, 138.51.0.0/16, 142.1.0.0/16, 142.150.0.0/16, and 142.151.0.0/16) and 3 IPv6 prefixes, with full global visibility (327/327 RIS v4 peers, 324/324 v6). CAIDA records exactly one provider, zero peers, and zero customers, giving a singleton customer cone and an AS rank of 12,673; the sole observed upstream is AS26677 (ORION — the Ontario Research and Innovation Optical Network), itself the path to CANARIE, Canada's national R&E backbone. RPKI posture could not be assessed at fetch time because RIPEstat's validator was queried without a prefix. No notable public abuse signal was found as of June 2026 — Scamalytics scores the ISP a low 7/100, there is no Spamhaus DROP/EDROP listing, and no BGP hijack or route-leak incident, NANOG thread, or AbuseIPDB ASN-level entry surfaced — consistent with a clean, long-established academic network.

Operator

University of Toronto (public research university; ARIN handle UTORONTO-AS; operated by ITS / Enterprise Infrastructure Solutions, Enterprise Networking) [Confirmed] — ARIN RDAP, its.utoronto.ca/its-units/eis/network-infrastructure

Country / RIR

Canada (CA), ARIN [Confirmed] — ARIN RDAP; RIPEstat abuse-contact-finder (authoritative_rir: arin)

Allocated

1988-09-20 (ARIN registry date, NOT an IEEE date — IEEE publishes no ASN registration dates); last changed 2009-07-31 [Confirmed] — ARIN RDAP autnum top-level events (corroborated by three angles)

Org status

public research university (non-profit / academic), Toronto, Ontario, Canada; AS239 operated by ITS / Enterprise Infrastructure Solutions (EIS) [Confirmed] — its.utoronto.ca/about

Contacts

eis.net.eng@utoronto.ca (technical and abuse role mailbox); the named POCs are NOC admin Douglas Carson and technical contact Russell Sutherland, whose personal mailboxes and direct lines are withheld here — consult the ARIN RDAP record directly; ITS, 4 Bancroft Avenue, Room 101C, Toronto, ON M5S 1C1, Canada [Confirmed for technical/abuse/address via RDAP + RIPEstat] — ARIN RDAP, RIPEstat abuse-contact-finder

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-20 — Scamalytics rates the ISP 7/100 (low fraud risk); no Spamhaus DROP/EDROP listing, no BGP hijack/route-leak incident, no NANOG thread, and no AbuseIPDB ASN-level entry; CleanTalk monitors individual subnets as routine coverage with no elevated block status [Likely] — scamalytics.com/ip/isp/university-of-toronto, spamhaus.org/blocklists/do-not-route-or-peer, cleantalk.org/blacklists/as239, bgpview.io/asn/239

Network & routing

Network type

education / research campus network — campus core, wireless (Campus WiFi, eduroam), and gateway to provincial/national R&E networks (ORION) [Confirmed] — its.utoronto.ca/its-units/eis/network-infrastructure, ipinfo.io/AS239

Size

15 IPv4 prefixes / ~331,264 IPv4 addresses and 3 IPv6 prefixes; customer cone = 1 ASN (itself), 15 prefixes, 331,264 addresses (stub AS) [Confirmed] — RIPEstat routing-status / CAIDA AS Rank / bgp.he.net (2026-06)

Routing/peering

announced and fully visible — 327/327 RIS v4 peers, 324/324 RIS v6 peers; CAIDA degree total 1 (customer 0, peer 0, provider 1); single observed neighbour, consistent with a single-homed stub [Confirmed]. IRR policy (bgp.he.net): import from AS-ANY accept any; export to AS-ANY announce AS26677:AS-GigaPoP

[Likely] — bgp.he.net/AS239

Upstreams

AS26677 (ORION — Ontario Research and Innovation Optical Network) for both IPv4 and IPv6; ORION is the university's path to CANARIE, Canada's national R&E network [Confirmed] — bgp.he.net/AS239, ipinfo.io/AS239, its.utoronto.ca

RPKI

not assessable in this run — RIPEstat RPKI validation was skipped (no prefix supplied at fetch time) [Unknown]

IX memberships

none found — not listed on the TorIX peer list and no PeeringDB record (404) for AS239 as of research date [Unknown] — torix.ca/peers

Notable usage

campus backbone for one of Canada's largest universities; hosts research computing, academic and administrative systems; provides eduroam wireless; routes via ORION to CANARIE; first seen in the global routing table 2000-08-18 (prefix 199.212.31.0/24)

[Confirmed] — its.utoronto.ca/its-units/eis/network-infrastructure, ipinfo.io/AS239, RIPEstat routing-status

Analyst note

Encountered as an early-numbered (1988) but actively routed stub ASN registered to a major Canadian R&E operator; single-homed to ORION (AS26677), no IXP/PeeringDB presence, clean reputation.