Why is it necessary for the moderator’s to see my IP address? ???
It is primarily used for tracking and effectively blocking Spammers. 
Okay but what do you track?
Spammers
Thanks.
do you have caller ID on your phone?
why?
No 
But I do use the “Do not Call” service.
Yes, on both phone lines.
Was this directed at me or bob3160?
You, and I believe what Pondus may have been getting at is that the forum IP monitoring is similar in how you use caller ID on your phone - to know who’s calling! and all forums monitor your IP by the way, not just avast.
Correct craig.
avast (any forum) reasons for doing it… the same as yours