nmap
--resume <filename> (Resume aborted scan)
Some extensive Nmap runs take a very long time—on the order of days. Such scans don't always run to completion. Restrictions may prevent Nmap from being run during working hours, the network could go down, the machine Nmap is running on might suffer a planned or unplanned reboot, or Nmap itself could crash. The administrator running Nmap could cancel it for any other reason as well, by pressing ctrl-C. Restarting the whole scan from the beginning may be undesirable. Fortunately, if scan output files were kept, the user can ask Nmap to resume scanning with the target it was working on when execution ceased. Simply specify the --resume option and pass the output file as its argument. No other arguments are permitted, as Nmap parses the output file to use the same ones specified previously. Simply call Nmap as nmap --resume <logfilename>. Nmap will append new results to the data files specified in the previous execution. Scans can be resumed from any of the 3 major output formats: Normal, Grepable, or XML