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+Ndiff
+
+Ndiff is a tool to aid in the comparison of Nmap scans. Specifically, it
+takes two Nmap XML output files and prints the differences between them.
+It is capable of showing changes in host states (up or down), port
+states (open, closed, etc.), script results, and changes in service and
+OS detection.
+
+To install, run (as root)
+ python setup.py install
+It's also possible to run the program from within the distribution
+without installing it.
+
+Use "ndiff --help" for usage instructions.
+
+Here is a sample of the output:
+
+$ ./ndiff test-scans/random-1.xml test-scans/random-2.xml
+-Nmap 4.85BETA4 at 2009-03-24 17:34
++Nmap 4.85BETA4 at 2009-03-25 16:35
+
+ 10.137.81.38:
+ OS details:
+ FreeBSD 6.2-RELEASE
+ Apple AirPort Extreme WAP v7.3.2
++ APC Network Management Card (AOS 3.3.5)
++ Apple iPod touch audio player (iPhone OS 2.1)
+
++10.181.218.66:
++Host is up.
++Not shown: 998 closed ports
++PORT STATE SERVICE VERSION
++222/tcp open rsh-spx
++8080/tcp filtered http-proxy
+
+-bpdygf-130.example.com (10.188.226.230):
+-Host is up.
+-Not shown: 1000 filtered ports
+
+ ysqxnovik-508.example.com (10.253.52.142):
+ PORT STATE SERVICE VERSION
++1503/tcp closed imtc-mcs
+-4567/tcp open tcpwrapped
+-OS details:
+- HP 4000M ProCurve switch (J4121A)
+- Nortel 5530 Ethernet Routing Switch
+- Nortel 5520 Ethernet Routing Switch
+- Sun StorageTek 6140 NAS device
+- FreeBSD 6.2-RELEASE
+
+
+Use -v or --verbose to see all hosts and ports, not just those that have
+changed.
+
+Ndiff started as a project by Michael Pattrick <mpattrick@rhinovirus.org>
+during the 2008 Google Summer of Code. Michael designed the program and
+led the discussion of its output formats. He wrote versions of the
+program in Perl and C++, but the summer ended shortly after it was
+decided to rewrite the program in Python for the sake of Windows
+compatibility. This Python version is written by David Fifield
+<david@bamsoftware.com>.
+
+Ndiff web site: https://nmap.org/ndiff/