Just search "proxy" on the forum, you'll find plenty of info without needing to ask the same question thats been asked and answered many times before.
Many people have been having trouble with them and massproxy.
No there isn't. There is a way to check if an IP is "blacklisted" but no way to tell if IG blacklisted it.
Edit: Not trying to sound rude, however the search function is not used enough....