Why did my son get banned on XBL?

Comma's are used to separate items; periods are used to end a [statement]. It makes more sense that a comma would be used to separate each group of 100's rather than a period which would go at the end.

This.
You don't say "I. Want. To. Eat. Pizza.", or "I wish I had a pony. a barn. and some hay". You use commas to show they're different but related. 100.100.100.100 = an IP address, not 100,100,100,100. (100 billion, 100 million, 100 thousand, 100.)

inb4 marladillion or w/e the crazy european name for a billion is.