Hi Brian, 0D04B7 was formerly XA-MXN and was operated by Mexicana which went out of business at the end of August. The aircraft has since been re-registered as XA-AMX with AeroMexico on 3/11/2010 and I presume it will have a new hex allocated but at this time it is unknown to me.
Re not seeing it on the network, was it ADSB equipped, shown by having a globe between tracked and status, if not it will not show on the network, only MyFlights.
Alan