LU - Luxembourg

Luxembourg is divided into 3 Districts, plus the Capital City as shown in the map. To detect the District you can use Wikipedia.

This eQSL shows the QTH: Beaufort.

Put this info into Wikipedia and you will find this:

The District is Grevenmacher, code LU-GM

REFERENCE	DESCRIPTION	PFX	DXCC	EURA CODE
EUCC-LU-DK	District of Diekirch	LX	254	EURA-056
EUCC-LU-GM	District of Grevenmacher	LX	254	EURA-056
EUCC-LU-LX	District of Luxembourg	LX	254	EURA-056
EUCC-LU-LC	Luxembourg City	LX	254	EURA-056

Another way to identificate the entity is based on the Postal Code. For our purposes the Postal Codes from 1000 to 2999 are considered as Luxembourg City and boundaries (red zone in the map)