pg_inet_addr is an extension that lists interface addresses. The addresses will be IPv4 and IPv6 addresses assigned to interfaces.

PostgreSQL local connections does not list IP addresses via inet_server_addr. Function pg_inet_addr provides all interface addresses even if you are not using a remote connection.

Build and install is done using PGXS. PostgreSQL 9.1+ installed (including the header files). As long as pg_config is available in the path, build and install using:

$ make
$ make install

mydb=# CREATE EXTENSION pg_inet_addr;
CREATE EXTENSION
mydb=# SELECT * FROM pg_inet_addr();
 interface |                address                 |                 netmask                 | family 
-----------+----------------------------------------+-----------------------------------------+--------
 lo        | 127.0.0.1                              | 255.0.0.0                               | IPv4
 wlp5s0    | 10.5.8.10                              | 255.255.255.0                           | IPv4
 lo        | ::1                                    | ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff | IPv6
 wlp5s0    | 2804:14d:3c82:41cb::4                  | ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff | IPv6
 wlp5s0    | 2804:14d:3c82:41cb:2944:ed92:9c61:e97f | ffff:ffff:ffff:ffff::                   | IPv6
 wlp5s0    | 2804:14d:3c82:41cb:5ec9:d3ff:fe98:24f7 | ffff:ffff:ffff:ffff::                   | IPv6
 wlp5s0    | fe80::5ec9:d3ff:fe98:24f7%wlp5s0       | ffff:ffff:ffff:ffff::                   | IPv6
(7 rows)

mydb=# SELECT interface, address FROM pg_inet_addr() WHERE interface <> 'lo';
 interface |                address                 
-----------+----------------------------------------
 wlp5s0    | 10.5.8.10
 wlp5s0    | 2804:14d:3c82:41cb::4
 wlp5s0    | 2804:14d:3c82:41cb:2944:ed92:9c61:e97f
 wlp5s0    | 2804:14d:3c82:41cb:5ec9:d3ff:fe98:24f7
 wlp5s0    | fe80::5ec9:d3ff:fe98:24f7%wlp5s0
(5 rows)

mydb=# SELECT interface, address, text(address::inet)  FROM pg_inet_addr() WHERE family = 'IPv4';
 interface |  address  |     text     
-----------+-----------+--------------
 lo        | 127.0.0.1 | 127.0.0.1/32
 wlp5s0    | 10.3.2.10 | 10.3.2.10/32
(2 rows)

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