South Korea:

ROKAF KUS-FS MUAV #71FF0B as MUAV0011 out of Seosan Air Base, operating over the West Sea.

South Korea:

ROKAF UAVs operating today:

KUS-FS MUAV #71FF0B as MUAV0011 over the West Sea
RQ-4B Global Hawk #71F0D2 is monitoring the border.

Its likely that 'MUAV0011' ICAO hex address of #71FF0B is a Republic of Korea (RoK) Medium-Altitude ISR UAV operating off the west coast of Korea over the Yellow Sea at an altitude of ~24,000' at ~80kts. Following the air vehicles track it appears the MUAV might be out of Seosan (K-76) Air Base.