My firewall has been of late picking up lots of scans everytime if get on,mostly on port 80 and some for Sub7. This is strange because usually i wasn't getting any. Now i have a couple of questions

1. Why is my firewall ZA being so active lately, is that all right.
2. Usually the scan is on port 80. Should i be worried


Also, from where can i get a list of ISPs and their addresses