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Test for overlapping IP ranges

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Special Forums IP Networking Test for overlapping IP ranges
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Old 04-11-2012
Question Test for overlapping IP ranges
Greetings folks,

I have a rather lengthy list of banned IP ranges in iptables. Initially it was constructed as a rather ad-hoc affair, then later I discovered a site which had IP Block By Country lists, and imported several into iptables.

If possible, I'd like to be able to verify if the list contains overlapping IP ranges (it almost inevitably must I'd think) but it's become h.u.g.e. and doing it manually is probably close to impossible.

Can anyone recommend a tool which can do this? A command line tool or Win32 -no preference - either is fine. Substantial Googling on this has, thus far, turned up nothing.

Regards & TIA,

putter
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LEARN ABOUT MOJAVE

cut

CUT(1)							    BSD General Commands Manual 						    CUT(1)

NAME

     cut -- cut out selected portions of each line of a file

SYNOPSIS

     cut -b list [-n] [file ...]
     cut -c list [file ...]
     cut -f list [-d delim] [-s] [file ...]

DESCRIPTION

     The cut utility cuts out selected portions of each line (as specified by list) from each file and writes them to the standard output.  If no
     file arguments are specified, or a file argument is a single dash ('-'), cut reads from the standard input.  The items specified by list can
     be in terms of column position or in terms of fields delimited by a special character.  Column numbering starts from 1.

     The list option argument is a comma or whitespace separated set of numbers and/or number ranges.  Number ranges consist of a number, a dash
     ('-'), and a second number and select the fields or columns from the first number to the second, inclusive.  Numbers or number ranges may be
     preceded by a dash, which selects all fields or columns from 1 to the last number.  Numbers or number ranges may be followed by a dash, which
     selects all fields or columns from the last number to the end of the line.  Numbers and number ranges may be repeated, overlapping, and in
     any order.  If a field or column is specified multiple times, it will appear only once in the output.  It is not an error to select fields or
     columns not present in the input line.

     The options are as follows:

     -b list
	     The list specifies byte positions.

     -c list
	     The list specifies character positions.

     -d delim
	     Use delim as the field delimiter character instead of the tab character.

     -f list
	     The list specifies fields, separated in the input by the field delimiter character (see the -d option.)  Output fields are separated
	     by a single occurrence of the field delimiter character.

     -n      Do not split multi-byte characters.  Characters will only be output if at least one byte is selected, and, after a prefix of zero or
	     more unselected bytes, the rest of the bytes that form the character are selected.

     -s      Suppress lines with no field delimiter characters.  Unless specified, lines with no delimiters are passed through unmodified.

ENVIRONMENT

     The LANG, LC_ALL and LC_CTYPE environment variables affect the execution of cut as described in environ(7).

EXIT STATUS

     The cut utility exits 0 on success, and >0 if an error occurs.

EXAMPLES

     Extract users' login names and shells from the system passwd(5) file as ``name:shell'' pairs:

	   cut -d : -f 1,7 /etc/passwd

     Show the names and login times of the currently logged in users:

	   who | cut -c 1-16,26-38

SEE ALSO

     colrm(1), paste(1)

STANDARDS

     The cut utility conforms to IEEE Std 1003.2-1992 (``POSIX.2'').

HISTORY

     A cut command appeared in AT&T System III UNIX.

BSD
								 December 21, 2006							       BSD