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unhide-tcp - Man Page

forensic tool to find hidden TCP/UDP ports


unhide-tcp [options]


unhide-tcp is a forensic tool that identifies TCP/UDP ports that are listening but are not listed by /sbin/ss (or alternatively by /bin/netstat) through brute forcing of all  TCP/UDP ports available.
Note1 : On FreeBSD ans OpenBSD, netstat is always used as iproute2 doesn't exist on these OS. In addition, on FreeBSD, sockstat is used instead of fuser. Note2 : If iproute2 is not available on the system, option -n or -s SHOULD be given on the command line.


-h --help

Display help


Don't display warning messages, that's the default behavior.

-f --fuser

Display fuser output (if available) for the hidden port On FreeBSD, instead of fuser command, displays the output of the sockstat command for the hidden port.

-l --lsof

Display lsof output (if available) for the hidden port

-n --netstat

Use /bin/netstat instead of /sbin/ss. On system with many opened ports, this can slow down the test dramatically.

-s --server

Use a very quick strategy of scanning. On system with a lot of opened ports, it is hundreds times faster than ss method and ten thousands times faster than netstat method.

-o --log

Write a log file (unhide-tcp-AAAA-MM-DD.log) in the current directory.

-V --version

Show version and exit

-v --verbose

Be verbose, display warning message (default : don't display). This option may be repeated more than once.

Exit status


if no hidden port is found,


if one or more hidden TCP port(s) is(are) found,


if one or more hidden UDP port(s) is(are) found,


if one or more hidden TCP and UDP ports are found.


Report unhide-tcp bugs on the bug tracker on GitHub (https://github.com/YJesus/Unhide/issues)

See Also

unhide (8).


This manual page was written by Francois Marier (francois@debian.org) and Patrick Gouin (patrickg.github@free.fr).
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 3 or any later version published by the Free Software Foundation.


License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.

Referenced By


June 2022 Administration commands