Help! Need reverse IP look up at Whois.sc

[polo1]

I just need to look up a couple of ip addresses and find out what domains hosted on it.I tried to buy a silver membership,but it's always failed.If Anyone can help me,I will pay you $5 by paypal.
Thanks...
Thomas

 

[barefoottech]

USe DNSstuff.com and it is Free

 

[polo1]

I have tried on dnsstuff.com.But it seemed no reverse ip lookup function.But I can find 7 websites hosted on 205.209.141.50.But I can't find any info on dnsstuff.com