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 who meet the following criteria:

• are practitioners of recognizable Japanese or Okinawan karate
• have been promoted by authoritative organization or yudansha
• who are 18 years of age and older

ISOK is not a black belt “mill”. We assess and award rank based on the international standards of organizations such as:

• the Dai Nippon Butokukai
• the International Martial Arts Federation.

Membership in ISOK is individual and self-directed. ISOK does not register organizations or karate schools, we only register individual yudansha and all our services/products are offered to individuals.