I have McAffee virusscan on my work computer, and every time I start up, I get 2 log entries like this:

Blocked by port blocking rule
C:\Program Files\Skype\Phone\Skype.exe
Anti-virus Standard Protection:Prevent IRC communication

The difference between the two, is that at the end there are 2 different IP addresses (which I don't recognise as belongs to us) with port :6667 on one and :6669 on the other.

Although this is logged, Skype seems to work as expected; including talking, chatting and
screen sharing (new feature in Skype 4.1).

Anyone knows anything about what this is?

EDIT:
I also have a Skype certified plugin in Skype called Cucku Backup. I did not find anything in the documentation that Cucku is trying to access these ports through Skype, but it could be...?

EDIT2:
I did a search on the IP addresses in question on www.webyield.net, and resulted in the following:

IP 71.251.72.173 (this one used port :6667):
Host name: pool-71-251-72-173.tampfl.fios.verizon.net

IP 79.87.54.165 (this one used port :6669):
Host name: 165.54.87-79.rev.gaoland.net