Hi there i am wondering if anyone can help me out. I have a Linux server hosting about 70 domains. Lately i have been noticing in my logs /var/log/messages following requests

Feb 10 02:43:42 gipsy named[572]: lame server resolving '83.52.225.82.ipwhois.rfc-ignorant.org' (in 'ipwhois.rfc-ignorant.org'?): 127.0.0.1#53
Feb 10 02:43:55 gipsy named[572]: lame server resolving '53.16.22.216.ipwhois.rfc-ignorant.org' (in 'ipwhois.rfc-ignorant.org'?): 127.0.0.1#53

Sometimes its up to three a second. Searched on google for similar behavior and found nothing. Has anyone seen this before? Could it be that my server is blacklisted? Or could it be some kind of hack?