http://www.arrl.org/dxcc-endorsementsOnce you have achieved an award you can build up your totals. As noted in DXCC rule 5 endorsement stickers for existing certificates are awarded as additional DXCC credits are earned. For the Mixed, Phone, CW, RTTY, 40, 30, 20, 17, 15, 12 and 10-Meter DXCCs, stickers are issued in exact multiples of 50 (i.e. 150, 200) etc. between 100 and 250 DXCC credits; in multiples of 25 between 250 and 300, and in multiples of 5 above 300 DXCC credits.