if you’ve worked in several different instances of Salesforce.com from several different locations, surely you’ve run into roadblocks on Salesforce.com Security Boulevard (and yes, I know you can use a security token, but many times I’m using a client’s license and he/she will “inadvertently” reset the token and lock me out of the org).

when in a new location, I used to copy my external ip from whatsmyip.com. well, if you’re using os x, you can leverage Applescript to make this a bit less painful.

set response to do shell script "/usr/bin/curl http://checkip.dyndns.org/"
set ip_address to extract_ip(response)

set the Reply to display dialog "Your IP address is: " & ip_address
set the clipboard to ip_address

-- Function to extract ip from HTML returned by dydns.com
on extract_ip(this_text)
	set clean_ip to ""
	set this_char to ""
	repeat with this_char in this_text
		set this_char to the contents of this_char
		if the this_char is in {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "."} then
			set the clean_ip to the clean_ip & this_char as string
		end if
	end repeat
	return the clean_ip
end extract_ip

-- end script

if you’re using Butler, you can run this applescript with a hot key. so, whenever I need my external ip, I simply hold command + shift + i and my ip address is copied to my clipboard for handy paste into the trusted ip ranges.

hth.