Langue: en

Version: 183751 (CentOS - 06/07/09)

Section: 5 (Format de fichier)


cidr_table - format of Postfix CIDR tables


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


The Postfix mail system uses optional lookup tables. These tables are usually in dbm or db format. Alternatively, lookup tables can be specified in CIDR (Classless Inter-Domain Routing) form.

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.


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 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 recommended.

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.


Patterns are applied in the order as specified in the table, until a pattern is found that matches the search string.


smtpd_client_restrictions = ... cidr:/etc/postfix/client.cidr ... /etc/postfix/client.cidr: # Rule order matters. Put more specific whitelist entries # before more general blacklist entries. OK REJECT


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


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


 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