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MIT Libraries

IP Ranges at MIT


[copyable view for email]

MIT's IP ranges are:

18.*.*.*
128.30.*.*
128.31.*.*
128.52.*.*
129.55.*.*
192.52.61.*-192.52.66.*
198.125.160.*-198.125.163.*
198.125.176.*-198.125.192.*

The IP address for the proxy server is 18.51.1.222.


Sample text about MIT's IP ranges:

It is not unusual for publishers to be surprised by MIT's IP range. We realize that you probably have not worked with an institution at this level before. MIT was initially assigned its class A IP range over 20 years ago, during the Laboratory for Computer Science's early involvement in internet research.

MIT is unique among universities in having a class A range; other class A institutions are generally governmental bodies, large corporations, or standards organizations. IP ranges are public information; for a representative list of class A IP assignments, see http://www.iana.org/assignments/ipv4-address-space.

If you need proof that MIT owns the 18.*.*.* range, there are many tools on the Web that show ownership of a given IP range. Two such places are Schwarzl IP checker at http://www.schwarzl.com/ipcheck.html and American Registry for Internet Numbers at http://www.arin.net/index.shtml.

The MIT Libraries must provide access to our electronic resources to the entire 18.*.*.* range, as the Institute has intentionally assigned IPs throughout the full range. We are not offering access through more machines, or to more people, than other campuses our size.

If your system technically prohibits entering a class A range, some information providers find that adding the equivalent in 256 class B ranges will work: 18.0.*.* through 18.255.*.*.


Here is a breakdown of the ranges we provide to publishers.

18.*.*.*

Most of campus (the Class A range)

128.30.*.*
128.31.*.*
CSAIL at Stata Center, on campus
(as of March 2004)

128.52.*.*

Artificial Intelligence Lab, on campus

129.55.*.*

Lincoln Laboratory, Lexington, MA

192.52.61.*-192.52.66.*

Haystack Observatory, Tyngsboro, MA

198.125.160.*-198.125.163.*

Ranges purchased for physicists on ESnet

198.125.176.*-198.125.192.*

Plasma Science Fusion Center


Here is a copyable version of this page, for you to cut and paste into email as needed:

18.*.*.*                     Most of campus (the Class A range)
128.30.*.*                   CSAIL at Stata Center, on campus
128.31.*.*                   CSAIL at Stata Center, on campus
128.52.*.*                   Artificial Intelligence Lab, on campus
129.55.*.*                   Lincoln Laboratory, Lexington, MA 
192.52.61.*-192.52.66.*      Haystack Observatory, Tyngsboro, MA

198.125.160.*-198.125.163.*  Ranges for physicists on ESnet
198.125.176.*-198.125.192.*  Plasa Science Fusion Center


It is not unusual for publishers to be surprised by MIT's 
IP range. We realize that you probably have not worked with 
an institution at this level before. MIT was initially assigned 
its class A IP range over 20 years ago, during the Laboratory 
for Computer Science's early involvement in internet research.


MIT is unique among universities in having a class A range; other 
class A institutions are generally governmental bodies, large 
corporations, or standards organizations. IP ranges are public 
information; for a representative list of class A IP assignments, 
see http://www.iana.org/assignments/ipv4-address-space


If you need proof that MIT owns the 18.*.*.* range, there are many 
tools on the web that show ownership of a given IP range.  Two such 
places are Schwarzl IP checker at http://www.schwarzl.com/ipcheck.html 
and American Registry for Internet Numbers at 
http://www.arin.net/index.shtml.

The MIT Libraries must provide access to our electronic resources to the entire 18.*.*.* range, as the Institute has intentionally assigned IPs throughout the full range. We are not offering access through more machines, or to more people, than other campuses our size. If your system technically prohibits entering a class A range, some information providers find that adding the equivalent in 256 class B ranges will work: 18.0.*.* through 18.255.*.*.
Last updated by Kim Maxwell, July 17, 2008