Well-known UW-Madison Campus IP address ranges and hosts

This document is to provide a handy reference for IP address ranges commonly used on the UW-Madison Campus.

DoIT Network Services recognizes the need for campus network administrators to allow or block certain IP address ranges to the infrastructure that they manage.  An attempt is made to keep this document the authoritative source but its contents are not guaranteed to be error free.


IPv4 ranges assigned to the UW-Madison Campus

  • 72.33.0.0/16
  • 144.92.0.0/16
  • 128.104.0.0/16
  • 128.105.0.0/16
  • 146.151.0.0/17 - Resnet
  • 146.151.128.0/17
  • 198.133.224.0/24
  • 198.133.225.0/24
  • 198.51.254.0/24

Private companies / Federal Government Agencies using UW IP space

  • 128.104.25.0/24 - Research Park: gcg.com
  • 128.104.76.0/23 - Forest Products Lab
  • 128.104.224.0/24 - Research Park: Science Drive LAN for multiple groups/depts
  • 128.104.225.0/24 - Research Park: Science Drive LAN for multiple groups/depts
  • 144.92.18.0/24 - MG&E Innovation Center-Rosa Rd.
  • 144.92.44.64/29 - Research Park: Tomotherapy
  • 144.92.81.128/25 - MG&E Innovation Center-Rosa Rd.
  • 144.92.89.96/27 - Research Park: Tomotherapy
  • 144.92.92.0/24 - MG&E Innovation Center-Rosa Rd.

RFC 1918 IPv4 ranges centrally managed by DoIT

  • 10.128.0.0/11

IPv6 ranges assigned to the UW-Madison Campus

  • 2607:F388::/32

IP ranges previously routed on UW-Madison [previously checked 2014/11/20]

  • 130.11.167.0/25 - USGS
  • 130.11.161.0/24 - USGS
  • 192.12.224.0/24 - University of Wisconsin-Madison Computer Systems Lab
  • 192.160.134.0/24 - Dane County University Extension
  • 2001:4e0:82::/48 [deprecated, 3/2008]

IP ranges assigned to UW System affiliates

  • 192.250.20.0/23 - University of Wisconsin Hospital and Clinics

Departmental GlobalProtect based WiscVPN Service

  • The external Public IP used for GlobalProtect Departmental VPN will be allocated from 144.92.105.0/26  (with some grandfathered exceptions)
  • The End User IP assigments for Departmental VPN GlobalProtect users will be assigned from 10.130.240.0/20 (with the following exceptions)
  • fundus  10.130.198.97-10.139.198.126
    smph 10.130.201.1-10.130.201.30
    Aquatics 10.130.240.1-10.130.204.30
    VetMed 10.130.225.161-10.130.225.254
    VetMed 10.130.228.1-10.130.228.254
    AIMS-IT  10.130.225.129-10.130.225.160
    HRS 10.130.3.1-10.130.3.254

  Campus DNS Servers

IPv4
  • 128.104.254.254
  • 144.92.254.254
IPv6
  • 2607:F388::53:1
  • 2607:F388::53:2
The Campus DNS infrastructure is implemented by a pool of redundant dns servers that answer dns requests to these addresses. These DNS servers are for use on the UW-Madison campus only. If you are off-campus, please use your provider's DNS servers.

To request changes or updates to the campus DNS service, please contact the DoIT HelpDesk.

WiscVPN Service

Legacy WiscVPN: 
  • 146.151.192.0/20 (146.151.192.0 - 146.151.207.255) for dynamically addressed VPN clients (decommissioned Winter of 2017 with decom of legacy WiscVPN service)
  • 146.151.208.0/20 (146.151.208.0 - 146.151.223.254) for static addressed VPN clients
For current information about the new WiscVPN service, see: WiscVPN GlobalProtect VPN

Security Scanning

The list of addresses used for network management and security scanning can be found here.

UWNet & Eduroam Wireless and Wired Authenticated Networks

The UWNet & Eduroam wireless clients utilize private IP addresses from the campus routable range mentioned in the RFC1918 section of this document.  These clients are routable to campus and use NAT/PAT behind pools of public IP addresses listed below for Internet access.
  • 10.138.0.0/15 - Eduroam clients, utilizes NAT/PAT behind 72.33.0.0/23 for Internet access
  • 10.140.0.0/15 - UWNET clients, utilizes NAT/PAT behind 72.33.2.0/23 for Internet access 
Wired UWNet is being deprecated and should no longer be considered a campus-wide service.

NTP Servers

DoIT has several stratum-2 or less servers; we do not have our own stratum-1 time source.

The addresses are as follows: 

ntp1.doit.wisc.edu
   128.104.30.17
   144.92.9.22
   2607:f388::123:1

ntp2.doit.wisc.edu
   144.92.20.100
   2607:f388::123:2

ntp3.doit.wisc.edu
   144.92.104.20
   2607:f388::123:3


Keywords:ip address assignment wiscnic dns allocation rfc 1918 subnet network networks range ranges   Doc ID:3988
Owner:Michael H.Group:Network Services
Created:2005-08-31 19:00 CDTUpdated:2017-10-05 09:19 CDT
Sites:DoIT Help Desk, DoIT Staff, Network Services, Systems & Network Control Center, Systems Engineering
Feedback:  21   17