I am looking for an online tool that can translate IPv6 to IPv4 addresses and vice versa.
Is there one out there some where?
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The basic answer is No there is not - this is because while some IPv6 addresses can be mapped to an IPv4 address automatically and vice versa for the vast majority of IPv6 addresses there is no possible direct equivalent.
This is because the IPv6 addresses outnumber IPv4 addresses by about 790,000,000,000,000,000,000,000,000,000 (7.9E28) to 1 so it is a bit like asking for a unique two way mapping between beaches and grains of sand.
Windows machines allow the IPv4 and IPv6 addresses to be set individually for each network adapter. There are some address ranges that are reserved for automatic mapping such as 255.0.a.b.c.d <=> a.b.c.d in Stateless IP/ICMP Translation and there are several other tunnelling mechanisms most of which rely on having known mappings. See this for more information.