According to the United States Naval Institute’s (USNI) IT department, the Navy Cyber Defense Operations Command (NCDOC) has recently placed bit.ly on the "Black Hole List" due to the Libyan connection in its domain.
Bit.ly, a link management platform, is used to shorten URLs for sharing on social media, email, and SMS. However, due to the Libyan country code, .ly, the U.S. Navy has expressed concern over the privacy and security of their networks when opening and using bit.ly codes.
As a result, the U.S. Navy has blocked any URL link containing bit.ly codes in order to prevent excessive phishing of the Department of Defense sent from bit.ly codes. Despite using the same top domain of .ly, the buff.ly and ow.ly platforms do not seem to be affected.
Bitly.com is still permissible as a paid URL shortener where a custom domain would not be flagged. In the meantime, USNI is switching to Google's shortener, goo.gl, as a free alternative for sharing news and Twitter links.