The ICAO aircraft type designator (code) is "B748" (no differention between Freighter and Pax) so they will show up on FlightAware etc. under that code. A quick check is showing FlightAware tracking BAW3457 ATL
as a B748 at the current time.
Flown in: A30B,A306,A310,A319,A320,A321,A332,A333,A343,A346,A359,A388,BA11,BU31,B190,(..54 more types..),VC10,WESX