Table 9.31, “cidr and inet Operators” 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 part is identical to or a subnet of the other.
Table 9.31. 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 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 9.32, “cidr and inet Functions” shows the functions available for use with the cidr and inet types. The host, text, and abbrev functions are primarily intended to offer alternative display formats. You can cast a text value to inet using normal casting syntax: inet(expression) or colname::inet.
Table 9.32. cidr and inet Functions
Function | Return Type | 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 |
hostmask(inet) | inet | construct host mask for network | hostmask('192.168.23.20/30') | 0.0.0.3 |
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 netmask length as text | text(inet '192.168.1.5') | 192.168.1.5/32 |
abbrev(inet) | text | abbreviated display format as text | abbrev(cidr '10.1.0.0/16') | 10.1/16 |
family(inet) | integer | extract family of address; 4 for IPv4, 6 for IPv6 | family('::1') | 6 |
Table 9.33, “macaddr Functions” shows the functions available for use with the macaddr type. The function trunc(macaddr) returns a MAC address with the last 3 bytes set to zero. 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 9.33. macaddr Functions
Function | Return Type | 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.