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For IPV4 and IPV6 coexistence
we use one of tree methods : Dual IPv4/IPv6 stacks, Tunneling, NAT Protocol Translator.
and when hosts must run one of the two protocols IPv6 or IPv4 we use NAT protocol Translator, so as Asim said its NAT-PT.
Yes, the mechanism is know as NAT-PT (Network Address Translation - Protocol Translation)
I am sharing this case study to clear your concept and helps you implement your network issue ...
https://www.ietf.org/proceedings/42/I-D/draft-ietf-ngtrans-natpt-02.txt