Last tested: April 2021
For Looker-hosted customers, this doc tells you which IP addresses to allowlist on your database. It also outlines other options for secure database connection.
For those hosting your own instance, you should allowlist the IP(s) that your Looker is running on. You'll also want to make sure you have a static IP set up—if it's a dynamic IP, it could change and prevent your allowlisting from getting the correct IP.
This content is subject to limited support.