2 ip adresses at the same time?

  cdb 17:07 09 Jan 06

I'm a mod on 2 forums and if I check my ip adress on each on it comes up different for posts made at the same time, even though I'm on NTL broadband. For example just now one started 81.101.xxx.xxx and the other one said 62.252.xxx.xx
Any ideas which one is correct?

Thank you

  VoG II 17:08 09 Jan 06
  cdb 17:11 09 Jan 06

It says the 81.xxx is correct any ideas why the other one is completely different?

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