which card organization a credit card belongs to depends on the sign in the lower right corner of the front of the card. You can also see it from the first two digits of the number.

CIRRUS is a sub-brand of MasterCard organization, and it seems that JCB and MasterCard have some cooperation, so both JCB credit cards have this CIRRUS logo.

JCB+ unionpay card can only use the network of JCB or unionpay card. But you can withdraw cash at an ATM with MasterCard logo.

cirrus is the symbol of ATM cards under MasterCard, and JCB credit cards can also withdraw money from ATMs with cirrus logo.