AS3128 — BRUWS-AS3128

Network type: education

AS3128 announces 11 IPv4 prefixes covering 655,616 addresses and 1 IPv6 prefixes.

About this network

BRUWS-AS3128 is held by the University of Wisconsin System, the state's public university system spanning UW-Madison, UW-Milwaukee, and the regional universities across Wisconsin.

What it's used for

• Campus and research networking for the UW System's institutions: academic and administrative systems, residence halls, labs, libraries, and public-facing university services.

Notable

• The announced space is unusually large for a single institution, running to several legacy /16s and over half a million IPv4 addresses. That scale is a signature of early university allocations, when a campus could ask for a Class B and get one.
• Institutional address space: IPs here map to university buildings and systems, not to residential subscribers or hosting customers. ARIN registered the ASN in 1993.

Interesting

• Wisconsin's state government runs its own separate network on AS3136, registered just two days later in the same 1993 batch.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 131.210.0.0/16
• 137.81.0.0/16
• 137.104.0.0/16
• 138.49.0.0/16
• 139.225.0.0/16
• 141.233.0.0/16
• 143.200.0.0/16
• 143.235.0.0/16
• 143.236.0.0/16
• 144.13.0.0/16
• 192.35.81.0/24
• 2600:1d00::/28

Upstream networks

• AS2381 WiscNet
• AS1299 Arelion Sweden AB
• AS11537 Internet2
• AS11164 Internet2
• AS6939 Hurricane Electric LLC
• AS7018 AT&T Enterprises, LLC

Downstream networks

• AS59 University of Wisconsin Madison
• AS46103 University of Wisconsin Whitewater
• AS7050 University of Wisconsin - Milwaukee
• AS19184 University of Wisconsin - Eau Claire
• AS47065 USC / UFMG PEERING Research Testbed
• AS394049 University of Wisconsin Hospital and Clinics

Adjacent networks

• AS2381 WiscNet
• AS59 University of Wisconsin Madison
• AS1299 Arelion Sweden AB
• AS46103 University of Wisconsin Whitewater
• AS7050 University of Wisconsin - Milwaukee
• AS19184 University of Wisconsin - Eau Claire
• AS11537 Internet2
• AS6939 Hurricane Electric LLC
• AS11164 Internet2
• AS7018 AT&T Enterprises, LLC
• AS47065 USC / UFMG PEERING Research Testbed
• AS394049 University of Wisconsin Hospital and Clinics

Internet exchanges

• Midwest Internet Cooperative Exchange — Minneapolis, United States
• Milwaukee Internet Exchange — Milwaukee, United States