nmap
 

i have 1000 hosts and 70 subnets at network in A , B , C classes.. so i want to scan all open 80 and 8080 ports hastily
how to do it ?
thanks your answers:)

Is there something wrong with 'man nmap' on your machine?
The title of your post shows you know the tool. Learn to use it. How are we supposed to know what your 70 subnets are?