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Documentation issue (-F)
From: Daniel Miller <bonsaiviking () gmail com>
Date: Thu, 12 Apr 2012 13:09:50 -0500
From the man page:
Empirically, I see Nmap scans 1000 ports by default, 100 with -F, and
<300 when nmap-services is not available. What is that last
parenthetical statement about? Is this old info which should be purged?
-F (Fast (limited port) scan) .
Specifies that you wish to scan fewer ports than the default.
Normally Nmap scans the most common 1,000 ports for each scanned
protocol. With -F, this is reduced to 100.
Nmap needs an nmap-services file with frequency information in
order to know which ports are the most common. If port frequency
information isn't available, perhaps because of the use of a custom
nmap-services file, -F means to scan only ports that are named in the
services file (normally Nmap scans all named ports plus ports 1–1024).
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- Documentation issue (-F) Daniel Miller (Apr 12)