[Wlug] I hate crackers (not the kind you eat)

OK, Looking at my log file from my firewall reveals that not I've got people trying to through my firewall from... 66.189.81.226 (and 246) (http connect attempts) 62.163.126.100 (same domain as yesterday) How do I track them back to the ISP's and send a message to their abuse@ address? Someone's trying to ping me from 66.189.24.226 as well. Am I being paranoid or could my isp be trying to crack my firewall to see if I've got any servers running? Time to batten down the hatches... Wes