Examiners required for SHODAN to GODAN examination are as following:

SHODAN: '1A OR 1B' + 1C or above
2 DAN: '1A or 1B' + 3 C or above
3 DAN: 1A + 1B or above
4 DAN: 1A + 2B or above
5 DAN: 2A + 2B or above

The DAN-I (DAN grade) required for examiners qualifications are as following:

D class 3 DAN (25 years old or older)
C class 4 DAN
B class 6 DAN
A class 7 DAN