Table 9-36 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 9-36. 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 9-37 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 9-37. cidr
and inet
Functions
Function | Return Type | Description | Example | Result |
---|---|---|---|---|
abbrev( | text | abbreviated display format as text | abbrev(inet '10.1.0.0/16') | 10.1.0.0/16 |
abbrev( | text | abbreviated display format as text | abbrev(cidr '10.1.0.0/16') | 10.1/16 |
broadcast( | inet | broadcast address for network | broadcast('192.168.1.5/24') | 192.168.1.255/24 |
family( | int | extract family of address; 4 for IPv4, 6 for IPv6 | family('::1') | 6 |
host( | text | extract IP address as text | host('192.168.1.5/24') | 192.168.1.5 |
hostmask( | inet | construct host mask for network | hostmask('192.168.23.20/30') | 0.0.0.3 |
masklen( | int | extract netmask length | masklen('192.168.1.5/24') | 24 |
netmask( | inet | construct netmask for network | netmask('192.168.1.5/24') | 255.255.255.0 |
network( | cidr | extract network part of address | network('192.168.1.5/24') | 192.168.1.0/24 |
set_masklen( | inet | set netmask length for inet value | set_masklen('192.168.1.5/24', 16) | 192.168.1.5/16 |
set_masklen( | cidr | set netmask length for cidr value | set_masklen('192.168.1.0/24'::cidr, 16) | 192.168.0.0/16 |
text( | text | extract IP address and netmask length as text | text(inet '192.168.1.5') | 192.168.1.5/32 |
inet_same_family( | boolean | are the addresses from the same family? | inet_same_family('192.168.1.5/24', '::1') | false |
inet_merge( | cidr | the smallest network which includes both of the given networks | inet_merge('192.168.1.5/24', '192.168.2.5/24') | 192.168.0.0/22 |
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 9-38 shows the functions available for use with the macaddr
type. The function trunc(
returns a MAC address with the last 3 bytes set to zero. This can be used to associate the remaining prefix with a manufacturer.macaddr
)
Table 9-38. macaddr
Functions
Function | Return Type | Description | Example | Result |
---|---|---|---|---|
trunc( | 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, and the bitwise arithmetic operators (~
, &
and |
) for NOT, AND and OR.
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