How to allow a single domain name with iptables

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http://serverfault.com – I am looking for a way to make iptables only accept requests for my domain name and reject the others. Lately I misconfigured my apache proxy, it is now fixed, but I keep receiving a load of requests looking like that : xxxx.xx:80 - - [12/Sep/2012:15:25:14 +0200] "GET http://ad.bharatstudent.com/st?ad_type=iframe&ad_size=700x300&section=3011105&pub_url=${PUB_URL} HTTP/1.0" 200 4985 "http://www.gethealthbank.com/category/medicine/" "Mozilla/4.0 (compatible; MSIE 5.5; Windows NT 4.0)" xxxx.xx:80 - - [12/Sep/2012:15:25:14 +0200] "GET http://mobile1.log (HowTos)