Former series 1947-1975. Diplomatic plates were of heavily embossed thick metal, with CD and a serial above the year and below ESPAÑA (or vice versa).

Former series 1977-1999. Embassy number 27 = USA

Current series since 1999. Diplomatic plates have had two letters denoting the category, an Embassy code  number (57 = Netherlands)  and a serial number.

Current series CC = Consular Corps (15 = Korean Republic)

Consular Corps (04 = Algeria)

OI = International Organization (31 = Gabon)

TA = Administrative and technical personnel
(304 =NATO)