Table 4-18. 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' |
All of the operators for inet can be applied to cidr values as well. 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 4-19. 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 |
| 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 |
All of the functions for inet can be applied to cidr values as well. The host(), text(), and abbrev() functions are primarily intended to offer alternative display formats.
Table 4-20. 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 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.
The macaddr type also supports the standard relational operators (>, <=, etc.) for lexicographical ordering.