(The forum forbids posting anything with a valid domain in it, reasonable for spam, unreasonable for talking about networking. Please read the following with . for DOT)

The validation on the "Domain/IP Address" field of the Network Check tool does not allow the DOTnetwork tld.

For example, if I put "exampleDOTnetwork", it says Invalid format. and disables submitting the form. If I shorten it to "exampleDOTnetwor", the box turns green and allows submitting the form.