Storing/retrieving IPv4 & IPv6 addresses in MySQL?

I would go with this: citat from there : How to store IPv6-compatible address in a relational database "Final decision taken: 2xBIGINT if the second bigint is NULL, then it means IPv4.

It sounds like your main concern is about space. If that's the case, then you could use the fact that IPv4 addresses are (essentially) 32-bit numbers and IPv6 are 128. An IPv4 address can be stored in an INT column, but IPv6 would require two BIGINT columns in MySQL.

This is likely to be much more space-efficient than storing strings.

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