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Or an Applescript that launches on login or runs in the background
Authored by: designr on Fri, May 18 2007 at 10:05AM PDT

property last_ip : ""
set my_IP to (do shell script "/sbin/ifconfig en0 | head -3 | grep 'inet ' | cut -d' ' -f 2") as string
if my_IP ≠ last_ip then
	set last_ip to my_IP
	if my_IP contains "192.168.0." then
		beep
		delay 2
		beep
	end if
else
	beep
end if