using grep to find IP address...

balgach_at_gmail.com
Date: 05/31/05 

Date: 31 May 2005 08:30:41 -0700

Hello all, i am interested in the last 255 bits of the local machines
ip address (aka the last number after the period) so far ive been
using the command, i know all the ip address start with 192.168

ifconfig | grep '192.168' | awk '{print $2}'

which is returning:

inet addr:192.168.0.20

now how do i get it just to return the '20' ??

thanks.

Cheers,
Adam.