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It's going to take a long time. There are options to vary the speed, the number of ports, and the amount of parallelism. Adjust them all for your use. Take a look at the defaults in nmap, and you'll see options that you might want to tweak. For instance, UDP scans take forever. From my experience, I would split up the scan into sections. Perform a quick ...


Do your own host discovery first. Like I said in a comment, use CIDR range instead of or in addition to your list of specific IP addresses. Maybe one scan from your list and a separate scan for host discovery. As the docs on host discovery say, One of the very first steps in any network reconnaissance mission is to reduce a (sometimes huge) set of IP ...

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