OK, that is a valid IP address.
The DoD owns all of the 11.0.0.0-11/255.255.255 domain.
The IP address is unreachable. That can be for any number of reasons. The most likely is that it is simply not in use by the DoD.
WWG1WGA
Garde la Foi, mes amis! Nous nous sommes les sauveurs de la République! Maintenant et Toujours!
(Keep the Faith, my friends! We are the saviors of the Republic! Now and Forever!)
LonePalm, le Républicain du verre cassé (The Broken Glass Republican)