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A comment on Ever wondered how many open FTP servers there are?. Parent comment

Re:Ever wondered how many open FTP servers there are? by bane on Saturday September 17, 2016 @11:45PM (#12523836)
There's still a uprising number of niche ftp site around: MSX, Demoscene, etc. Mostly older scenes that pre-date the WWW and are still around. I think it might be useful to test every port on every ip to see what happens protocol-wise. Limiting to just common ports is probably missing lots of cool things.
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Re:Ever wondered how many open FTP servers there are? by andai on Sunday September 18, 2016 @11:38AM (#12525700)
How many ports are there?
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Re:Ever wondered how many open FTP servers there are? by aeinstein1 on Sunday September 18, 2016 @12:18PM (#12525845)
According to Reserved IP addresses there are 588,514,304 reserved addresses and since there are 4,294,967,296 (2^32) IPv4 addressess in total, there are 3,706,452,992 public addresses. There are 65536 ports, so one would have to scan all those ports on all those addresses.
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