Since 2011, a small number of Black Swans has been ringed with blue neckbands in the southern part of The Netherlands. Young birds that were too small to use neckbands, received a coloured legring. The entry of a blue neckband with the code 00A0 is '00A0', choose ringtype 'blue neckband'. Blue legrings have to be entered in the same way with addition of the colour: B-AA (use hyphen between colour and code).

dark blue with white inscription (01A2) Netherlands 2011 - now

blue with white inscription - metal (B-AB) Netherlands 2011 - now