Hey there,
I am looking for all IPs with one special open port, for example 8001. So i use nmap like that to get them:
nmap -Pn -p 8001 -iL ip-ranges.txt -T3 --open
But this scan is doing so many things, which I maybe don't need:
Parallel DNS resolution of 4096 hosts. Timing: About 26.49% done; ETC: 07:51
Can somebody give me maybe some command parameters which make this scan faster?