Reason of searching with INET6_NTON()

I saw someone says that you can store IPV4 (4bytes) and IPV6 (16bytes) in a column of varbinary(16), and do something like the following code when you want to insert an IP:

INSERT INTO `log_table` (`ip_address`, `created_at`) VALUES(INET6_ATON(?), NOW());

Code (SQL):

Where ? is the IP to save.

I have no questions with above code as it is self-explanatory.

But then he says that when you want to search an IP, do this:

SELECT INET6_NTOA(`ip_address`) AS...

Code (SQL):

Reason of searching with INET6_NTON()

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