AS752

AS752 is a dormant legacy autonomous system registered under ARIN to Merit Network, Inc., a nonprofit research-and-education (R&E) network; it currently announces zero IPv4 and zero IPv6 prefixes and shows no observed BGP peers or upstreams, meaning it carries no live routing today.

Merit's actively-routed infrastructure runs under a different number — AS237 — which is registered separately on PeeringDB under org id 31248. AS752 does not appear in that org's PeeringDB listing at all, reinforcing that it is a legacy/dormant ASN held by an operationally active organization rather than that organization's current production ASN.

Merit Network was founded in 1966 as the Michigan Educational Research Information Triad by Michigan State University, the University of Michigan, and Wayne State University. It now describes itself as America's longest-running regional research and education network (REN), governed by Michigan's public universities and serving education, government, healthcare, libraries, and nonprofits primarily within the state. Merit also organized and administered NANOG from 1994 to roughly 2011.

Registry facts place AS752's ARIN registration (RIR short name MERIT-AS-18) at 1990-10-08, per the autnum's top-level RDAP registration event, with a last-changed event of 2012-04-02. The registrant organization handle is MICH-Z, at 880 Technology Drive, Suite B, Ann Arbor, MI 48108.

Merit publishes a general "Peering & Caching" service page describing Layer 3 member peering and Internet2 Peer Exchange access at typical capacities of 10 Gbps or more, plus direct peering with 100+ cloud providers. That page does not name AS752 or AS237 specifically and contains no formal open/selective/restrictive peering-policy classification, so AS752's own peering posture cannot be documented beyond "not currently announcing."

Operator

Merit Network, Inc. (nonprofit R&E network; ARIN org handle MICH-Z, Ann Arbor, MI) [Confirmed] — https://rdap.arin.net/registry/autnum/752, https://www.merit.edu/about/

Country / RIR

US, ARIN [Confirmed] — https://rdap.arin.net/registry/autnum/752

Allocated

1990-10-08 (ARIN RDAP autnum top-level registration event); last changed 2012-04-02 [Confirmed] — https://rdap.arin.net/registry/autnum/752

Org status

active independent nonprofit corporation (Merit Network, Inc.), founded 1966 as the Michigan Educational Research Information Triad by Michigan State University, the University of Michigan, and Wayne State University; governed by Michigan's public universities

[Confirmed] — https://www.merit.edu/about/, https://en.wikipedia.org/wiki/Merit_Network

Contacts

abuse@merit.edu; ipreg@merit.edu (admin); operations@merit.edu (tech); org handle MICH-Z, 880 Technology Drive, Suite B, Ann Arbor, MI 48108 [Confirmed] — https://rdap.arin.net/registry/autnum/752

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-07-28 — not in Spamhaus ASN-DROP, CleanTalk (no populated data for AS752), or NANOG archives; AbuseIPDB's ASN page returned HTTP 403 and is unverified rather than confirmed clean [Likely] — https://www.spamhaus.org/blocklists/spamhaus-blocklist/, https://cleantalk.org/blacklists/as752, https://www.abuseipdb.com/check/752

Network & routing

Network type

nonprofit regional research and education (R&E) network, member-governed by Michigan's public universities; AS752 is legacy/inactive — Merit's actively-routed ASN is AS237 [Confirmed] — https://www.merit.edu/about/, https://www.peeringdb.com/org/31248

Size

dormant — 0 IPv4 prefixes / 0 IPv4 addresses and 0 IPv6 prefixes; CAIDA AS rank 79,459 (the standard sentinel rank CAIDA assigns to unrouted ASNs; not seen, not clique member); customer cone is a singleton — 1 ASN, 0 prefixes, 0 addresses

[Confirmed] — https://bgp.he.net/AS752, https://bgp.tools/as/752, https://api.asrank.caida.org/v2/restful/asns/752

Routing/peering

NOT announced — 0 peers/upstreams observed in current routing tables; AS752 does not appear in Merit's PeeringDB org (31248) listing, which instead registers AS237 [Confirmed]. Merit's general peering/caching page (10 Gbps+ member access, 100+ cloud-provider peers) does not name AS752 or give a formal policy classification

[Likely] — https://bgp.he.net/AS752, https://bgp.tools/as/752, https://www.merit.edu/solutions/networking-security/peering-caching/

RPKI

not assessable — AS752 announces no prefixes, so there are no ROAs to validate; bgp.he.net shows 0 RPKI-valid and 0 RPKI-invalid origins [Confirmed] — https://bgp.he.net/AS752

Notable usage

Merit Network organized and administered NANOG (1994–~2011) and describes itself as America's longest-running regional R&E network; AS752 (MERIT-AS-18) is an early/legacy Merit ASN distinct from the actively-routed AS237

[Confirmed] — https://www.merit.edu/about/, https://en.wikipedia.org/wiki/Merit_Network

Related ASNs

AS237 (Merit's actively-routed network, PeeringDB org 31248) [Confirmed] — https://www.peeringdb.com/org/31248

Analyst note

Encountered as a dormant legacy ASN registered to a historically significant, currently-active R&E operator; RDAP/WHOIS resolves to Merit Network, but live routing runs under AS237, not AS752. Clean, inactive ASN with no independently confirmed abuse history (AbuseIPDB unverified due to a 403 response). AS rank is 79,459 (CAIDA's sentinel rank for unrouted ASNs) with a singleton customer cone (1 ASN, 0 prefixes, 0 addresses), per CAIDA AS Rank; bgp.tools does not surface either figure for this ASN, but CAIDA's own API does.