Hi. I'm new here (got channeled here while searching out the possibilities of two (or more) members having the same IP address).
I've seen plenty of "evidence" and reason, while doing my research, that IP addresses are (should be?) unique.
I was a moderator on a discussion board that had approximately 500 members many having more than 100 posts per day. At one point I ran the IP of a questionable poster (our forum had the ability to "find all posts from this IP). Eight (yes 8 ) different members names came up along with the one I was investigating. Two of them were other mods on the site. Intrigued, I pulled up the other mod's posts and found that there were about 7 IPs and that they shared some of them.
I recently had an "argument" with my fiance (who was a computer tech for many years). He said that this was virtually impossible, there being over 4 billion IP possibilities.
My explanation? ... Most of the people on this board were military, ex-military or spouses. Perhaps, through their military connection they signed up with a small service provider who does not have a huge block of IPs and switches them around. All of these same members that I "knew" (I didn't know all 8 ) were all from North Carolina/South Carolina.
So ... am I off my rocker? LMK. Thanks for your input!