AS20

AS20 is a legacy single-digit allocation registered under ARIN to the University of Rochester in New York, and it remains a live campus network — not the University of Maryland, a common low-number mix-up (UMD is AS27). RFC 1020/1166 label it "UR — University of Rochester," the same institution then and now. It originates about three IPv4 prefixes and one IPv6 prefix, including the historic 128.151.0.0/16 block (~258 /24s of IPv4 and 256 /48s of IPv6), taking transit from Cogent (AS174), Lumen/Global Crossing (AS3549), and Charter (AS11351), with roughly seven peers; bgp.tools classifies it Eyeball/Academic. The ARIN ASN RegDate of 1984-07-27 is the registry date (the org record's 2009 date is a refresh, not the original assignment). For triage this is a standard flagship-university network, actively routed, with a low-abuse academic profile. No notable public abuse signal was found as of June 2026.

Operator

University of Rochester (ARIN OrgId UNIVER-40-Z, Rochester, NY) [Confirmed] — ARIN RDAP

Country / RIR

US, ARIN [Confirmed]

Allocated

ARIN ASN RegDate 1984-07-27 (registry date; org RegDate 2009-03-30 is a refresh, not original assignment) [Confirmed for shown date]

Org status

active — rochester.edu

Security/abuse context (NEUTRAL, DATED)

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

Network & routing

Network type

research / education [Confirmed]

Size

3 IPv4 prefixes, 1 IPv6; incl. 128.151.0.0/16 (~258 /24s) — bgp.tools (2026-06)

Routing/peering

actively announcing; upstreams Cogent (AS174), Lumen/Global Crossing (AS3549), Charter (AS11351), ~7 peers; RPKI unknown — bgp.tools

Notable usage

University of Rochester campus network; RFC 1020/1166 "UR"; announces 128.151.0.0/16. NOT University of Maryland (that's AS27) — ipip.net

Related ASNs

none specifically confirmed for this profile

Analyst note

Standard flagship-university network, actively routed; low-abuse academic profile. This is Rochester, not Maryland (AS27).