If it is 138.162.0.42 then you most likely accidently sent yourself a password hint/reminder (clicked forgot my password link.)
Because your username is bob it’s more likely that it was some robot (or human) trying to access your account.
I would certainly know if I were posting from an NNIC IP address. Since I don't work for the Navy and I'm 3000 miles away from their offices, that's not a possibility.
I strongly suggest you change your user name to Sue, Jill, or Cathy.