Table 9.37 shows the operators
   available for the cidr and inet types.
   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.
  
Table 9.37. cidr and inet Operators
| Operator | Description | Example | 
|---|---|---|
| < | is less than | inet '192.168.1.5' < inet '192.168.1.6' | 
| <= | is less than or equal | inet '192.168.1.5' <= inet '192.168.1.5' | 
| = | equals | inet '192.168.1.5' = inet '192.168.1.5' | 
| >= | is greater or equal | inet '192.168.1.5' >= inet '192.168.1.5' | 
| > | is greater than | inet '192.168.1.5' > inet '192.168.1.4' | 
| <> | is not equal | inet '192.168.1.5' <> inet '192.168.1.4' | 
| << | is contained by | inet '192.168.1.5' << inet '192.168.1/24' | 
| <<= | is contained by or equals | inet '192.168.1/24' <<= inet '192.168.1/24' | 
| >> | contains | inet '192.168.1/24' >> inet '192.168.1.5' | 
| >>= | contains or equals | inet '192.168.1/24' >>= inet '192.168.1/24' | 
| && | contains or is contained by | inet '192.168.1/24' && inet '192.168.1.80/28' | 
| ~ | bitwise NOT | ~ inet '192.168.1.6' | 
| & | bitwise AND | inet '192.168.1.6' & inet '0.0.0.255' | 
| | | bitwise OR | inet '192.168.1.6' | inet '0.0.0.255' | 
| + | addition | inet '192.168.1.6' + 25 | 
| - | subtraction | inet '192.168.1.43' - 36 | 
| - | subtraction | inet '192.168.1.43' - inet '192.168.1.19' | 
   Table 9.38 shows the functions
   available for use with the cidr and inet
   types.  The abbrev, host,
   and text
   functions are primarily intended to offer alternative display
   formats.
  
Table 9.38. cidr and inet Functions
   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.  (Where there are
   separate functions for inet and cidr, it is because
   the behavior should be different for the two cases.)
   Also, it is permitted to cast an inet value to cidr.
   When this is done, any bits to the right of the netmask are silently zeroed
   to create a valid cidr value.
   In addition,
   you can cast a text value to inet or cidr
   using normal casting syntax: for example,
   inet( or
   expression)colname::cidr
   Table 9.39 shows the functions
   available for use with the macaddr type.  The function
   trunc(macaddr)
Table 9.39. macaddr Functions
    The macaddr type also supports the standard relational
    operators (>, <=, etc.) for
    lexicographical ordering, and the bitwise arithmetic operators
    (~, & and |)
    for NOT, AND and OR.
   
   Table 9.40 shows the functions
   available for use with the macaddr8 type.  The function
   trunc(macaddr8)
Table 9.40. macaddr8 Functions
    The macaddr8 type also supports the standard relational
    operators (>, <=, etc.) for
    ordering, and the bitwise arithmetic operators (~,
    & and |) for NOT, AND and OR.