UMnet Administration supports network administrators on campus, coordinates the networking infrastructure and network numbers, and manages and maintains key infrastructures and services, including:
Backbone Technologies and Router Services
UMnet Admin uses Open Shortest Path First (OSPF) as internal gateway protocol (IGP) and Boarder Gateway Protocol (BGP) as external gateway protocol (EGP). Multiprotocol Label Switching (MPLS) and IPv6 technologies are currently being explored.
Campus DHCP/DNS Services simplify computing site administration by setting up setup of domain name servers and domain name delegation. Any unit that needs to assign and track IP addresses for their computers, printers, IP phones, or other devices that connect to the Internet can use the DHCP/DNS service.
The Network Information Database (NetInfo) is available to search and review the current configuration of any network on the Ann Arbor campus, excluding the medical campus. For other network tools, see the Repair and Network Operations Center (NOC).
Policies and Standard Practice Guides
Networks Assigned to the University of Michigan
||UM Ann Arbor (Guest wired and wireless — SEE NOTE BELOW)
||UM Ann Arbor (UMnet and CAEN Authenticated Wireless — SEE NOTE BELOW)
||UM Ann Arbor (UMnet; Authenticated Wireless and Residence Halls)
||UM Ann Arbor (UMnet)
||UM Ann Arbor (CAEN)
||UM Ann Arbor (CAEN)
||UM Ann Arbor (UMnet)
||UM Ann Arbor (UMHS)
||UM Backbone Interconnect (UMBIN - interconnects UMnet, UMHS, CAEN, UM Dearborn and Merit)
||UM Ann Arbor (UMnet NOC)
||UM Ann Arbor (IP Telephony and Network Infrastructure)
||UM Ann Arbor (ITS Comm Interoperability Lab)
||UM Ann Arbor (UMHS public-facing servers)
||UM Ann Arbor (UMnet WAN-connected off-campus networks)
||UM Ann Arbor (allocated as shown below)
||ITS Comm Interoperability Lab
For information on private IP addressing at UM, see Assigning Private IP Network Numbers.
UM received a new IP address allocation (188.8.131.52/17) August 20, 2007
UM received a new IP address allocation (184.108.40.206/17) May 29, 2008
These two are merged into a single block: 220.127.116.11/16
UM received a new IP address allocation (18.104.22.168/16) April 2010
UM received a new IP address allocation (22.214.171.124/16) August 2012
- The 126.96.36.199/16 block will be used for guest wired/wireless networks. Users of these addresses should not be considered UM faculty/staff/students!
This block has been subdivided as follows:
- 188.8.131.52/18 - Reserved
- 184.108.40.206/18 - UMnet guest users
- 220.127.116.11/18 - CAEN guest users
- 18.104.22.168/18 - UMHS guest users
- The 22.214.171.124/16 block will be used for Authenticated wireless networks. Users of these addresses should be considered U-M faculty/staff/students
- The University Libraries currently do NOT allow direct access to licensed on-line resources for any wireless users.
Wireless users may use any of the following methods to obtain access to Library on-line resources:
- Follow links on library Websites, such as Mirlyn,
the AAEL Library page,
or Library Research Guides.
These links will always route you through
the library's proxy server and provide access to the resources after
authentication with your uniqname & password.
- Use the library's Proxy bookmarklet.
After installing the bookmarklet in
your Web browser, you can click on the bookmarklet in your toolbar to
reload the page you are on through the proxy server.
Details on installing
the bookmarklet can be found here.
- Bookmark only library-provided stable URLs for your commonly used
A listing of frequently-accessed sites with their URLs are
listed at the end of this message; for others, please look them up in the
databases section of SearchTools.
- Use the U-M Virtual Private Network (VPN), which will make it appear as
if you are coming from an IP address within the U-M "wired" IP range.
If you have any questions about access to library resources, please contact
Ask a Librarian.
on installing and running the U-M VPN are available from ITS
To establish new service or for questions regarding services or billing, contact your Project Manager.
For questions regarding a network, contact UMnet Administration at firstname.lastname@example.org or 734-647-4200.
For users experiencing network problems, contact ITS Repair at email@example.com or 734-647-8888.
- Please note that your network may be supported by other U-M information technology providers:
- U-M Health System networks (IP addresses of 141.214.x.y) are administered by Medical Center Information Technology (MCIT).
- College of Engineering networks (IP addresses of 141.212.x.y and some 141.213.x.y) are administered by Computer Aided Engineering Network (CAEN).