getting external IP remotely from the web (xfinity.com)

Is it possible to see my current external IP from my xfinity.com account?  The router I have doesn't support dynamic DNS, and I have no always-on clients at home on which to run a DDNS updater.  I'd like to be able to check to see if my home IP has changed (due to power outage, whatever) while I'm away on business.