we dont have full controll of what ips are blocked we using a world wide database that gets updated daily if your ip is in there database then it must meen your isp do alot of spamming and the ip range is all blocked or someone who used to have your ip used it to spam alot with it
your ip prob changes every time u restart your router so now n then u might land on a ip thats banned we wont be removing this feature as we would get spammed alot like we used to get when we first started the site in the first month we got more than 1000 spam messages and we had to delete em all by hand so its alot of work for no return
if your wondering where we get the ip database from we use these sites if you want you could ask them to remove your ip from there database and then it would work fine with our site
dnsbl.othello.ch (our most used database 99% of the queries goes to them)
rhsbl.ahbl.org
multi.surbl.org
bsb.spamlookup.net
uribl.spameatingmonkey.net
this is prob the most used service once u get past all the registration this is what prob blocking your ip the most
http://www.stopforumspam.com
we also use other services like block disposable emails so users cant register with a throw away email address