The BlueAngels made their pass around the DFW area today. The code I saw was _~280A05 I assume that was BA Ship #1. Just tossing it here for future reference.
That's TIS-B, so rebroadcast of radar data. Will have a different hex every time, that's why the hex has ~ in front, it's not a real hex id. The _ is only added to the name in the list to signify it's not a callsign.