The luxembourgish amateur radio callsign is composed of the prefix LX, followed by a one digit number (0-9) and the suffix composed of at least 2 characters (AA-ZZ) and at most 4 characters (AAAA-ZZZZ).
The one digit number is as follows:

0 *	automatic stations
1,2,3	HAREC-licence
4,5 **	special stations
6	NOVICE-licence
7,8 **	special stations
9 ***	group stations (group licence)

When operating mobile the additional suffix /M must be used, when operating portable that suffix is /P, when being maritime mobile the suffix is /MM.

* Each amateur radio operator can apply for a callsign of an automatic station (e.g. beacon, repeater, hamnet, APRS, ATV, hotspot, ...). Access to that automatic station must the be granted to all amateur radio operators. If the station is operated "strictly locally" then it must be operated under the personal callsign of the amateur radio operator. In that case the operation must be declared to the ILR.

** The callsigns with the numbers 4, 5, 7, 8 are reserved for amateur radio stations who take part in contests or for non-tempoprary special activites, for education or for common public interest. In order to get such a callsign, the operator must possess a HAREC licence.

*** A group of interested people may operate an amateur radio station for educational or experimental reasons. The operation is under the responsibility of the amateur radio operator who applied for the licence of the group station.

Callsigns which do not respect the standard scheme may be attributed for temporary special activities. Those callsigns are attributed for at most 6 months.

Short callsigns with only one character after the number can be obtained by amateur radio operators who have owned a personal callsign for at least 6 years and who have been shining in amateur radio. The amateur radio operator who wants such a callsign has to prove that he merits that callsign..

Each amateur radio operator owning a foreign licence CEPT T/R 61-01 (HAREC) or ECC (05)06 (NOVICE), may operate temporarily in Luxembourg by using the additional prefix  LX/ (HAREC) or LX6/ (NOVICE) with his own callsign. Examples: LX/ON1ABC, LX6/DO1ABC. The regulator does not issue a special callsign LX4,5,7,8 to foreign licence owners with no fixed address in Luxembourg.

Additional informations can be found in the regulations F16/02/ILR from March 18th 2016 .