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6.10. Network Address Type Functions

Table 6-23 shows the operators available for the inet and cidr types. The operators <<, <<=, >>, >>= test for subnet inclusion: they consider only the network parts of the two addresses, ignoring any host part, and determine whether one network part is identical to or a subnet of the other.

Table 6-23. cidr and inet Operators

Operator Description Usage
< Less than inet '192.168.1.5' < inet '192.168.1.6'
<= 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'
>= Greater or equal inet '192.168.1.5' >= inet '192.168.1.5'
> Greater inet '192.168.1.5' > inet '192.168.1.4'
<> Not equal inet '192.168.1.5' <> inet '192.168.1.4'
<< is contained within inet '192.168.1.5' << inet '192.168.1/24'
<<= is contained within 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'

Table 6-24 shows the functions available for use with the inet and cidr types. The host(), text(), and abbrev() functions are primarily intended to offer alternative display formats. You can cast a text field to inet using normal casting syntax: inet(expression) or colname::inet.

Table 6-24. cidr and inet Functions

Function Returns Description Example Result
broadcast(inet) inet broadcast address for network broadcast('192.168.1.5/24') 192.168.1.255/24
host(inet) text extract IP address as text host('192.168.1.5/24') 192.168.1.5
masklen(inet) integer extract netmask length masklen('192.168.1.5/24') 24
set_masklen(inet,integer) inet set netmask length for inet value set_masklen('192.168.1.5/24',16) 192.168.1.5/16
netmask(inet) inet construct netmask for network netmask('192.168.1.5/24') 255.255.255.0
network(inet) cidr extract network part of address network('192.168.1.5/24') 192.168.1.0/24
text(inet) text extract IP address and masklen as text text(inet '192.168.1.5') 192.168.1.5/32
abbrev(inet) text extract abbreviated display as text abbrev(cidr '10.1.0.0/16') 10.1/16

Table 6-25 shows the functions available for use with the mac type. The function trunc(macaddr) returns a MAC address with the last 3 bytes set to 0. This can be used to associate the remaining prefix with a manufacturer. The directory contrib/mac in the source distribution contains some utilities to create and maintain such an association table.

Table 6-25. macaddr Functions

Function Returns Description Example Result
trunc(macaddr) macaddr set last 3 bytes to zero trunc(macaddr '12:34:56:78:90:ab') 12:34:56:00:00:00

The macaddr type also supports the standard relational operators (>, <=, etc.) for lexicographical ordering.

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