The most basic Nikto scan requires simply a host to target, since port 80 is assumed if none is specified. The host can either be an IP or a hostname of a machine, and is specified using the -h (-host) option. This will scan the IP 192.168.0.1 on TCP port 80:

perl nikto.pl -h 192.168.0.1

To check on a different port, specify the port number with the -p (-port) option. This will scan the IP 192.168.0.1 on TCP port 443:

perl nikto.pl -h 192.168.0.1 -p 443

Hosts, ports and protocols may also be specified by using a full URL syntax, and it will be scanned:

perl nikto.pl -h https://192.168.0.1:443/

There is no need to specify that port 443 may be SSL, as Nikto will first test regular HTTP and if that fails, HTTPS. If you are sure it is an SSL server, specifying -s (-ssl) will speed up the test.

perl nikto.pl -h 192.168.0.1 -p 443 -ssl

	Note
	-mutate 1 increases the number of tests so that all filenames are tested against all databases inc db_tests. This will produce over 2,000,000 extra tests, which will use up a massive amount of resource.

More complex tests can be performed using the -mutate parameter, as detailed later. This can produce extra tests, some of which may be provided with extra parameters through the -mutate-options parameter. For example, using -mutate 3, with or without a file attempts to brute force usernames if the web server allows ~user URIs:

perl nikto.pl -h 192.168.0.1 -mutate 3 -mutate-options user-list.txt

Nikto can scan multiple ports in the same scanning session. To test more than one port on the same host, specify the list of ports in the -p (-port) option. Ports can be specified as a range (i.e., 80-90), or as a comma-delimited list, (i.e., 80,88,90). This will scan the host on ports 80, 88 and 443.

perl nikto.pl -h 192.168.0.1 -p 80,88,443

Nikto support scanning multiple hosts in the same session via a text file of host names or IPs. Instead of giving a host name or IP for the -h (-host) option, a file name can be given. A file of hosts must be formatted as one host per line, with the port number(s) at the end of each line. Ports can be separated from the host and other ports via a colon or a comma. If no port is specified, port 80 is assumed.

This is an example of a valid hosts file:

192.168.0.1:80
http://192.168.0.1:8080/
192.168.0.3

	Note
	For win32 users: due to peculiaries in the way that cmd.exe works with pipes, the above example may not work for you. In this case a temporary file will have to be used to store the output from nmap

A host file may also be an nmap output in "greppable" format (i.e. from the output from -oG).

A file may be passed to Nikto through stdout/stdin using a "-" as the filename. For example:

nmap -p80 192.168.0.0/24 -oG - | nikto.pl -h -

If the machine running Nikto only has access to the target host (or update server) via an HTTP proxy, the test can still be performed. Set the PROXY* variables (as described in section 4), then execute Nikto with the -u (-useproxy) command. All connections will be relayed through the HTTP proxy specified in the configuration file.

perl nikto.pl -h 192.168.0.1 -p 80 -u

Nikto can be automatically updated, assuming you have Internet connectivity from the host Nikto is installed on. To update to the latest plugins and databases, simply run Nikto with the -update command.

	Note
	The -update option cannot be abbreviated.

perl nikto.pl -update

If updates are required, you will see a list of the files downloaded:

 perl nikto.pl -update
 + Retrieving 'nikto_core.plugin'
 + Retrieving 'CHANGES.txt'

Updates may also be manually downloaded from http://www.cirt.net/

Nessus (http://www.nessus.org/nessus/) can be configured to automatically launch Nikto when it finds a web server. Ensure Nikto works properly, then place the directory containing nikto.pl in root's PATH environment variable. When nessusd starts, it should see the nikto.pl program and enable usage through the GUI.