whois harvester

I'm not sure if it's common knowledge by now, but I've built a script to check sites for inactive Administrative Contact emails (whois) and register those domains so that one may take possession of the original domain (by requesting "forgotten password" from the registrar, which send to the new...

I've been looking for a good whois scraper/harvester. For a start, I need something that can check 10k specific domains w/o getting blocked every 8-15 records. Or at least can change its ip address after every 5-10 records pulled. hidemyass.c0m/vpn/ can change my ip every xx minutes...