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    Command:

    cidr_table

    
    
    

    SYNOPSIS

           postmap -q "string" cidr:/etc/postfix/filename
    
           postmap -q - cidr:/etc/postfix/filename <inputfile
    
    
    

    DESCRIPTION

           The  Postfix mail system uses optional lookup tables.  These tables are
           usually in dbm or db format.  Alternatively, lookup tables can be spec-
           ified 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 system supports
           use the "postconf -m" command.
    
           To test lookup tables, use the "postmap -q" command as described in the
           SYNOPSIS above.
    
    
    

    TABLE FORMAT

           The general form of a Postfix CIDR table is:
    
           network_address/network_mask     result
                  When  a  search  string matches the specified network block, use
                  the corresponding result value. Specify 0.0.0.0/0 to match every
                  IPv4 address, and ::/0 to match every IPv6 address.
    
                  An  IPv4  network  address  is a sequence of four decimal 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. Therefore 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.
    
           network_address     result
                  When a search string matches the specified network address,  use
                  the corresponding result 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 logical line.
    
    
    

    TABLE SEARCH ORDER

           postmap(1), Postfix lookup table manager
           regexp_table(5), format of regular expression tables
           pcre_table(5), format of PCRE tables
    
    
    

    README FILES

           Use "postconf readme_directory" or "postconf html_directory" to  locate
           this information.
           DATABASE_README, Postfix lookup table overview
    
    
    

    HISTORY

           CIDR table support was introduced with Postfix version 2.1.
    
    
    

    AUTHOR(S)

           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
    
                                                                     CIDR_TABLE(5)
    
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