7 countries now replace the former Yugoslavia : Slovenia (SLO), Croatia (HR), Bosnia Herzegovina (BIH), Kosovo (KS), Macedonia (MK), Serbia (SRB) and Montenegro (MNE).
Before the 90s wars, registrations had distinctive 2 letters that are still used in these 5 countries : Slovenia, Croatia, Macedonia, Serbia and Montenegro.

SLOVENIA : CE GO KP KR LJ MB MS NM

CROATIA : BJ BM ČK DA DE DS DU GS KA KC KN KR KT KŽ MA NA NG OG OS PU RI SB SI ŠI SP ST TK VK VT VU VŽ ZD ZG
                             During the war, Krajina used the codes :
BM GN KE KNN MK OK VN VU

BOSNIA I HERZEGOVINA  used : BI BL BN BU ČP DO GŽ JC KNJ LI MD MO PD SA SC TB TD TR TZ VI ZE ZV before the war.
                             During the war, the Moslem part also used BR, the Srpska Republika used codes in cyrillic,  
                            
Herceg Nova with its flag used these codes : BU ČA DR GR JA KI KO LI LJ MO OR PO RA SB TG TR ŽE
 KOSOVO used : DJ GL KM PE PJ PR PZ TM UR before the war

MACEDONIA : BT GV KU OH PP SK SR ŠT TE TV

SERBIA : AR BG BO ČA GM KG KŠ KV LE LO NI NP PB PI PK PN PO NP ŠA SD SV TS TU +UE VA VR ZA
                             including the region of Voivodine :
KI KK NS PA RU SM SO SU VŠ ZR.

MONTENEGRO : +BA BD BP BR CT HN IG KO NK PG PV TG +UL