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  5. Functions and Operators
  6. Network Address Functions and Operators

Network Address Functions and Operators

cidr and inet Operators

The operators <<, <<=, >>, and >>= test for subnet inclusion. They consider only the network parts of the two addresses (ignoring any host part) and determine whether one network is identical to or a subnet of the other.

  • <

    Description: Is less than

    For example:

    SELECT inet '192.168.1.5' < inet '192.168.1.6' AS RESULT;
     result 
    --------
     t
    (1 row)
  • <=

    Description: Is less than or equals

    For example:

    SELECT inet '192.168.1.5' <= inet '192.168.1.5' AS RESULT;
     result 
    --------
     t
    (1 row)
  • =

    Description: Equals

    For example:

    SELECT inet '192.168.1.5' = inet '192.168.1.5' AS RESULT;
     result 
    --------
     t
    (1 row)
  • >=

    Description: Is greater than or equals

    For example:

    SELECT inet '192.168.1.5' >= inet '192.168.1.5' AS RESULT;
     result 
    --------
     t
    (1 row)
  • >

    Description: Is greater than

    For example:

    SELECT inet '192.168.1.5' > inet '192.168.1.4' AS RESULT;
     result 
    --------
     t
    (1 row)
  • <>

    Description: Does not equal to

    For example:

    SELECT inet '192.168.1.5' <> inet '192.168.1.4' AS RESULT;
     result 
    --------
     t
    (1 row)
  • <<

    Description: Is contained in

    For example:

    SELECT inet '192.168.1.5' << inet '192.168.1/24' AS RESULT;
     result 
    --------
     t
    (1 row)
  • <<=

    Description: Is contained in or equals

    For example:

    SELECT inet '192.168.1/24' <<= inet '192.168.1/24' AS RESULT;
     result 
    --------
     t
    (1 row)
  • >>

    Description: Contains

    For example:

    SELECT inet '192.168.1/24' >> inet '192.168.1.5' AS RESULT;
     result 
    --------
     t
    (1 row)
  • >>=

    Description: Contains or equals

    For example:

    SELECT inet '192.168.1/24' >>= inet '192.168.1/24' AS RESULT;
     result 
    --------
     t
    (1 row)
  • ~

    Description: Bitwise NOT

    For example:

    SELECT ~ inet '192.168.1.6' AS RESULT; 
        result     
    ---------------
     63.87.254.249
    (1 row)
  • &

    Description: The "and" operation is performed on each bit of the two network addresses.

    For example:

    SELECT inet '192.168.1.6' & inet '10.0.0.0' AS RESULT;
     result  
    ---------
     0.0.0.0
    (1 row)
  • |

    Description: The "or" operation is performed on each bit of the two network addresses.

    For example:

    SELECT inet '192.168.1.6' | inet '10.0.0.0' AS RESULT;
       result    
    -------------
     202.168.1.6
    (1 row)
  • +

    Description: Addition

    For example:

    SELECT inet '192.168.1.6' + 25 AS RESULT;
        result    
    --------------
     192.168.1.31
    (1 row)
  • -

    Description: Subtraction

    For example:

    SELECT inet '192.168.1.43' - 36 AS RESULT;
       result    
    -------------
     192.168.1.7
    (1 row)
  • -

    Description: Subtraction

    For example:

    SELECT inet '192.168.1.43' - inet '192.168.1.19' AS RESULT;
     result 
    --------
         24
    (1 row)

cidr and inet Functions

The abbrev, host, and text functions are primarily intended to offer alternative display formats.

  • abbrev(inet)

    Description: Abbreviated display format as text

    Return type: text

    For example:

    SELECT abbrev(inet '10.1.0.0/16') AS RESULT;
       result    
    -------------
     10.1.0.0/16
    (1 row)
  • abbrev(cidr)

    Description: Abbreviated display format as text

    Return type: text

    For example:

    SELECT abbrev(cidr '10.1.0.0/16') AS RESULT;
     result  
    ---------
     10.1/16
    (1 row)
  • broadcast(inet)

    Description: Broadcast address for network

    Return type: inet

    For example:

    SELECT broadcast('192.168.1.5/24') AS RESULT;
          result      
    ------------------
     192.168.1.255/24
    (1 row)
  • family(inet)

    Description: Extracts family of address; 4 for IPv4, 6 for IPv6

    Return type: int

    For example:

    SELECT family('::1') AS RESULT;
     result 
    --------
          6
    (1 row)
  • host(inet)

    Description: Extracts IP address as text.

    Return type: text

    For example:

    SELECT host('192.168.1.5/24') AS RESULT;
       result    
    -------------
     192.168.1.5
    (1 row)
  • hostmask(inet)

    Description: Constructs host mask for network.

    Return type: inet

    For example:

    SELECT hostmask('192.168.23.20/30') AS RESULT;
     result  
    ---------
     0.0.0.3
    (1 row)
  • masklen(inet)

    Description: Extracts subnet mask length.

    Return type: int

    For example:

    SELECT masklen('192.168.1.5/24') AS RESULT;
     result 
    --------
         24
    (1 row)
  • netmask(inet)

    Description: Constructs subnet mask for network.

    Return type: inet

    For example:

    SELECT netmask('192.168.1.5/24') AS RESULT;
        result     
    ---------------
     255.255.255.0
    (1 row)
  • network(inet)

    Description: Extracts network part of address.

    Return type: cidr

    For example:

    SELECT network('192.168.1.5/24') AS RESULT;
         result     
    ----------------
     192.168.1.0/24
    (1 row)
  • set_masklen(inet, int)

    Description: Sets subnet mask length for inet value.

    Return type: inet

    For example:

    SELECT set_masklen('192.168.1.5/24', 16) AS RESULT;
         result     
    ----------------
     192.168.1.5/16
    (1 row)
  • set_masklen(cidr, int)

    Description: Sets subnet mask length for cidr value.

    Return type: cidr

    For example:

    SELECT set_masklen('192.168.1.0/24'::cidr, 16) AS RESULT;
         result     
    ----------------
     192.168.0.0/16
    (1 row)
  • text(inet)

    Description: Extracts IP address and subnet mask length as text.

    Return type: text

    For example:

    SELECT text(inet '192.168.1.5') AS RESULT;
         result     
    ----------------
     192.168.1.5/32
    (1 row)

Any cidr value can be cast to inet implicitly or explicitly; therefore, the functions shown above as operating on inet also work on cidr values. An inet value can be cast to cidr. After the conversion, any bits to the right of the subnet mask are silently zeroed to create a valid cidr value. In addition, you can cast a text string to inet or cidr using normal casting syntax. For example, inet(expression) or colname::cidr.

macaddr Functions

The function trunc(macaddr) returns a MAC address with the last 3 bytes set to zero.

trunc(macaddr)

Description: Sets last 3 bytes to zero.

Return type: macaddr

For example:

SELECT trunc(macaddr '12:34:56:78:90:ab') AS RESULT;
      result       
-------------------
 12:34:56:00:00:00
(1 row)

The macaddr type also supports the standard relational operators (such as > and <=) for lexicographical ordering, and the bitwise arithmetic operators (~, & and |) for NOT, AND and OR.