This option lets you include binary data as payload in sent packets. <hex string> may be specified in any of the following formats: 0xAABBCCDDEEFF<...>, AABBCCDDEEFF<...> or \xAA\xBB\xCC\xDD\xEE\xFF<...>. Examples of use are --data 0xdeadbeef and --data \xCA\xFE\x09. Note that if you specify a number like 0x00ff no byte-order conversion is performed. Make sure you specify the information in the byte order expected by the receiver.

This option lets you include a regular string as payload in sent packets. <string> can contain any string. However, note that some characters may depend on your system's locale and the receiver may not see the same information. Also, make sure you enclose the string in double quotes and escape any special characters from the shell. Example: --data-string "Jimmy Jazz...".

This option lets you include <len> random bytes of data as payload in sent packets. <len> must be an integer in the range [0–65400]. However, values higher than 1400 are not recommended because it may not be possible to transmit packets due to network MTU limitations.