Validated XF Owner
In the IP V6 range, I wouldn't anticipate any problems in the near future. There is no shortage of IP V6 addresses and they aren't prone to movement.You must validate your XenForo license to see quoted content
IP V4 is another story. IP V4 addresses are in constant flux, so the longer the database isn't updated the less accurate it will be. As an example, this IP address range 220.127.116.11/18 was delegated to Germany on February 4th of this year (that's 16384 addresses). I don't know where it was originally delegated to.
In December of 2018, the database size was 3.5mb. Today it's 4.1mb. That size increase includes additions to the IP V6 addresses and the IP V4 addresses being moved about.