Ip address and subnet mask!

[Maada Moseray]

 I am trying to install postgresql and I have the following instructions (in
red)

# Connections for all PCs on the subnet
#
# TYPE DATABASE USER IP-ADDRESS IP-MASK METHOD
host    all         all         [ip address]          [subnet mask]
md5

Which of the values below refers to the IP address and subnet mask.
Do I use info from "net lookup" of from eth0, or from lo

maadamos61 at maadamos61-desktop:~$ net lookup maadamos61-desktop
127.0.1.1
maadamos61 at maadamos61-desktop:~$ ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0D:9D:D6:E4:1E
          inet addr:192.168.0.15  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::20d:9dff:fed6:e41e/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:10312 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8007 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:11341964 (10.8 MiB)  TX bytes:1265127 (1.2 MiB)
          Interrupt:17

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:2431593 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2431593 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:292756973 (279.1 MiB)  TX bytes:292756973 (279.1 MiB)
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