ISOK is an international service organization for legitimate black belt practitioners and instructors who practice Okinawan and Japanese karate systems. Our mandate is to help individual black belts manage their own karate progress and achieve success. We use a modern business model and international standards to interface directly with individual black belts.

ISOK membership is open to black belt practitioners of karate who are 18 years of age and older. Basic membership costs USD$25 for 12 months and provides many benefits.

ISOK is not a black belt “mill”. We assess and award rank based on the international standards of the Dai Nippon Butokukai and the International Martial Arts Federation.