Autonomous system detail

AS38

Announced

Operated by UIUC - University of Illinois.

Summary

// analyst note
A live legacy university number; much of UIUC campus traffic also rides AS40387 (upstreams Arelion AS1299, Pavlov Media AS23473).
// security note
NEUTRAL/DATED: no notable public abuse signal found as of 2026-06-09; clean academic network.
IPv4 prefixes
4
~213.0K addresses
IPv6 prefixes
3
announced
Peer networks
2
2 up · 0 down
IANA block
1-1876
Assigned by ARIN
[ 01 ] — Context

About this ASN.

Updated  ·  Confidence: High

AS38 is a legacy allocation registered under ARIN to the University of Illinois, one of the earliest ARPANET/Internet research-university numbers — RFC 1020 (1987) already lists it as "UIUC." Its current holder matches that historical label, and the ASN is actively routed in 2026: it originates a small set of prefixes (about 6 IPv4 and 2 IPv6) and peers with the University of Illinois's own AS40387 (UI-ICCN) and with Internet2 (AS11537). The closely related AS40387 carries the bulk of the University of Illinois at Urbana-Champaign's campus routing and is maintained under MAINT-AS38 — a direct link between the legacy and modern numbers. For triage, AS38 is a live legacy university number; much of UIUC's campus traffic also rides AS40387 (upstreams Arelion AS1299 and Pavlov Media AS23473). The ARIN ASN RegDate is 1985-01-24. No notable public abuse signal was found as of June 2026.

Operator
University of Illinois (ARIN OrgId UIUC) [Confirmed] — ARIN RDAP
Country / RIR
US, ARIN [Confirmed]
Allocated
ARIN ASN RegDate 1985-01-24 (updated 2014-12-02) [Confirmed] — ARIN RDAP
Org status
organization active; ASN actively routed

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-09; clean academic network — bgp.he.net

Network & routing

Network type
research / education [Confirmed]
Size
actively announcing ~8 prefixes (~6 IPv4 + ~2 IPv6) — bgp.he.net / IPinfo (2026-06)
Routing/peering
active; peers incl. AS40387 (UI-ICCN, same operator) and AS11537 (Internet2); RPKI status not captured — bgp.he.net
Notable usage
[historical, RFC 1020] AS38 "UIUC" = University of Illinois at Urbana-Champaign, an early ARPANET/Internet research-university allocation. [current] actively routed; closely related AS40387 (UI-ICCN), RADB maintained under MAINT-AS38, carries much of campus routing — illinois.edu
Related ASNs
AS40387 (UI-ICCN — carries much of UIUC campus routing), AS11537 (Internet2 peer), AS698 (ASN-UIUC-REGION-AS), AS10764, AS6200 (Univ. of Illinois at Chicago) [Confirmed]
Analyst note
A live legacy university number; much of UIUC campus traffic also rides AS40387 (upstreams Arelion AS1299, Pavlov Media AS23473).
[ 02 ] — Announced prefixes

What this network routes.

7 prefixes total · RIPEstat data · cached, not real-time
// IPv4 prefixes4
  1. 128.174.0.0/16/16
  2. 130.126.0.0/16/16
  3. 192.17.0.0/16/16
  4. 72.36.64.0/18/18
// IPv6 prefixes3
  1. 2600:3900::/28/28
  2. 2620:0:e00::/48/48
  3. 2620:0:e01::/48/48
[ 03 ] — Notable peers & upstreams

Who it talks to.

2 observed neighbours
// Notable connectionsTop 2 of 2
ASNOperatorRole
AS40387 UI-ICCN - University of Illinois upstream
AS11537 INTERNET2-RESEARCH-EDU - Internet2 upstream
Neighbours observed via public BGP collectors; not a complete peering list.