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CIDR_TABLE(5)                                                    CIDR_TABLE(5)

       cidr_table - format of Postfix CIDR tables

       <b>postmap -q "</b><i>string</i><b>" <a href="cidr_table.5.html">cidr</a>:/etc/postfix/</b><i>filename</i>

       <b>postmap -q - <a href="cidr_table.5.html">cidr</a>:/etc/postfix/</b><i>filename</i> &lt;<i>inputfile</i>

       The  Postfix  mail  system  uses  optional  lookup tables.
       These tables are usually in <b>dbm</b> or  <b>db</b>  format.   Alterna-
       tively,  lookup tables can be specified in CIDR (Classless
       Inter-Domain Routing) form. In this case,  each  input  is
       compared  against  a  list  of  patterns.  When a match is
       found, the corresponding result is returned and the search
       is terminated.

       To  find out what types of lookup tables your Postfix sys-
       tem supports use the "<b>postconf -m</b>" command.

       To test lookup tables, use the  "<b>postmap  -q</b>"  command  as
       described in the SYNOPSIS above.

       The general form of a Postfix CIDR table is:

       <i>network</i><b>_</b><i>address</i><b>/</b><i>network</i><b>_</b><i>mask     result</i>
              When  a search string matches the specified network
              block, use the corresponding <i>result</i> value.  Specify
      to match every IPv4 address, and ::/0 to
              match every IPv6 address.

              An IPv4 network address is a sequence of four deci-
              mal  octets  separated  by ".", and an IPv6 network
              address is a sequence of three to eight hexadecimal
              octet pairs separated by ":".

              Before  comparisons are made, lookup keys and table
              entries are converted from string to binary. There-
              fore  table  entries  will be matched regardless of
              redundant zero characters.

              Note: address information may  be  enclosed  inside
              "[]" but this form is not required.

              IPv6 support is available in Postfix 2.2 and later.

       <i>network</i><b>_</b><i>address     result</i>
              When a search string matches the specified  network
              address, use the corresponding <i>result</i> value.

       blank lines and comments
              Empty  lines and whitespace-only lines are ignored,
              as are lines whose first  non-whitespace  character
              is a `#'.

       multi-line text
              A  logical  line starts with non-whitespace text. A
              line that starts with whitespace continues a  logi-
              cal line.

       Patterns  are applied in the order as specified in the ta-
       ble, until a pattern is  found  that  matches  the  search

       /etc/postfix/<a href="postconf.5.html"></a>:
           <a href="postconf.5.html#smtpd_client_restrictions">smtpd_client_restrictions</a> = ... <a href="cidr_table.5.html">cidr</a>:/etc/postfix/client.cidr ...

       /etc/postfix/client.<a href="cidr_table.5.html">cidr</a>:
           # Rule order matters. Put more specific whitelist entries
           # before more general blacklist entries.

<b>SEE ALSO</b>
       <a href="postmap.1.html">postmap(1)</a>, Postfix lookup table manager
       <a href="regexp_table.5.html">regexp_table(5)</a>, format of regular expression tables
       <a href="pcre_table.5.html">pcre_table(5)</a>, format of PCRE tables

       <a href="DATABASE_README.html">DATABASE_README</a>, Postfix lookup table overview

       CIDR table support was introduced with Postfix version 2.1.

       The CIDR table lookup code was originally written by:
       Jozsef Kadlecsik
       KFKI Research Institute for Particle and Nuclear Physics
       POB. 49
       1525 Budapest, Hungary

       Adopted and adapted by:
       Wietse Venema
       IBM T.J. Watson Research
       P.O. Box 704
       Yorktown Heights, NY 10598, USA

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