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

  Example:

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

• <=

  Description: Is less than or equals

  Example:

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

• =

  Description: Equals

  Example:

  MogDB=# SELECT inet '192.168.1.5' = inet '192.168.1.5' AS RESULT;
   result
  --------
   t
  (1 row)

• >=

  Description: Is greater than or equals

  Example:

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

• >

  Description: Is greater than

  Example:

  MogDB=# SELECT inet '192.168.1.5' > inet '192.168.1.4' AS RESULT;
   result
  --------
   t
  (1 row)

• <>

  Description: Does not equal to

  Example:

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

• <<

  Description: Is contained in

  Example:

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

• <<=

  Description: Is contained in or equals

  Example:

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

• >>

  Description: Contains

  Example:

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

• >>=

  Description: Contains or equals

  Example:

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

• ~

  Description: Bitwise NOT

  Example:

  MogDB=# SELECT ~ inet '192.168.1.6' AS RESULT;
      result
  ---------------
   63.87.254.249
  (1 row)

• &

  Description: Performs an AND operation on each bit of the two network addresses.

  Example:

  MogDB=# SELECT inet '192.168.1.6' & inet '10.0.0.0' AS RESULT;
   result
  ---------
   0.0.0.0
  (1 row)

• |

  Description: Performs an OR operation on each bit of the two network addresses.

  Example:

  MogDB=# SELECT inet '192.168.1.6' | inet '10.0.0.0' AS RESULT;
     result
  -------------
   202.168.1.6
  (1 row)

• +

  Description: Addition

  Example:

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

• -

  Description: Subtraction

  Example:

  MogDB=# SELECT inet '192.168.1.43' - 36 AS RESULT;
     result
  -------------
   192.168.1.7
  (1 row)

• -

  Description: Subtraction

  Example:

  MogDB=# 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

  Example:

  MogDB=# 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

  Example:

  MogDB=# SELECT abbrev(cidr '10.1.0.0/16') AS RESULT;
   result
  ---------
   10.1/16
  (1 row)

• broadcast(inet)

  Description: Broadcast address for networks

  Return type: inet

  Example:

  MogDB=# SELECT broadcast('192.168.1.5/24') AS RESULT;
        result
  ------------------
   192.168.1.255/24
  (1 row)

• family(inet)

  Description: Extracts family of addresses, 4 for IPv4, and 6 for IPv6.

  Return type: int

  Example:

  MogDB=# SELECT family('127.0.0.1') AS RESULT;
   result
  --------
        4
  (1 row)

• host(inet)

  Description: Extracts IP addresses as text.

  Return type: text

  Example:

  MogDB=# SELECT host('192.168.1.5/24') AS RESULT;
     result
  -------------
   192.168.1.5
  (1 row)

• hostmask(inet)

  Description: Constructs the host mask for a network.

  Return type: inet

  Example:

  MogDB=# 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

  Example:

  MogDB=# SELECT masklen('192.168.1.5/24') AS RESULT;
   result
  --------
       24
  (1 row)

• netmask(inet)

  Description: Constructs the subnet mask for a network.

  Return type: inet

  Example:

  MogDB=# SELECT netmask('192.168.1.5/24') AS RESULT;
      result
  ---------------
   255.255.255.0
  (1 row)

• network(inet)

  Description: Extracts the network part of an address.

  Return type: cidr

  Example:

  MogDB=# 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 the inet value.

  Return type: inet

  Example:

  MogDB=# 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 the cidr value.

  Return type: cidr

  Example:

  MogDB=# 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 addresses and subnet mask length as text.

  Return type: text

  Example:

  MogDB=# 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

  Example:

MogDB=# 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.