Ncat Copyright and Licensing
Ncat is (C) 2005–2020 Insecure.Com LLC. It is distributed
as free and open source software under the same license terms as our
Nmap software. Precise terms and further details are available
in the section called “Nmap Copyright and Licensing”.
Creative Commons License for this Ncat Guide
This Ncat Reference Guide is (C) 2005–2018 Insecure.Com LLC. It is
hereby placed under version 3.0 of the Creative Commons
Attribution License. This allows you redistribute and modify
the work as you desire, as long as you credit the original source.
Alternatively, you may choose to treat this document as falling under
the same license as Ncat itself (discussed previously).
Source Code Availability and Community Contributions
Source is provided to this software because we believe users
have a right to know exactly what a program is going to do before they
run it. This also allows you to audit the software for security holes
(none have been found so far).
Source code also allows you to port Nmap (which includes Ncat)
to new platforms, fix bugs, and add new features. You are highly
encouraged to send your changes to
<firstname.lastname@example.org> for possible incorporation into
the main distribution. By sending these changes to Fyodor or one of
the Insecure.Org development mailing lists, it is assumed that you are
offering the Nmap Project (Insecure.Com LLC) the unlimited,
non-exclusive right to reuse, modify, and relicense the code. Nmap
will always be available open source, but this is important because the
inability to relicense code has caused devastating problems for other
Free Software projects (such as KDE and NASM). We also occasionally
relicense the code to third parties as discussed in the Nmap man page.
If you wish to specify special license conditions of your
contributions, just say so when you send them.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the Nmap Public Source
License for more details at https://nmap.org/npsl/,
or in the
included with Nmap.
Ncat should never be installed with special privileges
(e.g. suid root).
That would open up a major security vulnerability as other users on the
system (or attackers) could use it for privilege escalation.
This product includes software developed by
the Apache Software
Foundation. A modified version of the Libpcap portable packet capture
is distributed along with Ncat.
The Windows version of Ncat utilized the Libpcap-derived
Certain raw networking functions use the
networking library, which was written by Dug Song.
A modified version is distributed with Ncat.
Ncat can optionally link with the
for SSL version detection support.
All of the third-party software described in this paragraph is freely
redistributable under BSD-style software licenses.