so is the ip addresses I'm seeing valid then or is it being masked? Is there somewhere I can report this or do anything besides be happy that my firewall is blocking the attempts?

hi there , being happy the firewall is doing the job of blocking unsolicited host is just not enough as a network admin. Just think of a stranger nocking your home door for two hours three or four hours, you would definately seek to find out more and take some action. This is something you would record and log and not just let it go but watch your logs, one thing you could do is to take notes of that external host IP addres and find which ISP is providing the IP address, you could search "whois" database , that,will provide you with which ISP is the IP block under and report to abuse records on the ISP side.

Yeah I've already found out who, well at least which ISP it is coming from and reported it already. Just was wondering if there was anything else I can do besides that.

Thank you for the info though

it is good practice to have anothe device in front of pix as srue indicated in post so that these attacks do not hit your outside interface firewall.