Nmap NSE net: qscan

Repeatedly probe open and/or closed ports on a host to obtain a series of round- trip time values for each port. These values are used to group collections of ports which are statistically different from other groups. Ports being in different groups or 'families' may be due to network mechanisms...

qscan NSE Script

Repeatedly probe open and/or closed ports on a host to obtain a series of round-trip time values for each port. These values are used to group collections of ports which are statistically different from other groups. Ports being in different groups or "families" may be due to network mechanisms...