grep_output

# nmap -p80 -Pn -oG - 10.1.0.1/24
#
Host: 10.1.0.43 ()      Ports: 80/open/tcp//http///
$1    $2        $3      $4     $5

# nmap -p80 -Pn -oG - 10.1.0.1/24 | awk '/open/{print $2 " " $3}'
10.1.0.1 ()
10.1.0.2 ()
...

nmap_flags

-T4   Aggressive timing
-A    OS and version detection
-v    Verbose
-oG   Greppable output
-oA   XML file
-F    Fast mode (scans fewer ports)
-sO   IP Protocol scan
-sV   Probe open ports to determine service/version info
-sn   Ping scan (host 'up' or 'down') - disable port scan
-sL   List scan (host always 'unknown') - simply list targets to scan