[rednum]

Perhaps it was something like:

  1. OP finds an IP in [insert-not-so-large-irish-city-name-here].
  2. OP remebers having a friend in [not-so-large-irish-city],
     somehow obtains his IP (which is not a hard thing).
  3. Bingo, adresses match!
  4. OP is confused, but then remembers that his friend has 
     teenage soon, so he calls the friend to ask about the kid.

In other words, if it were some random troll, he wouldn't be able to do this.