DNS Propagation Checker
whatsmydns.net lets you instantly perform a DNS lookup to check a domain name's current IP address and DNS record information against multiple nameservers located in different parts of the world.
MySQL Sandbox with the Sakila sample database
You can go to https://www.katacoda.com/mysql-db-sandbox/scenarios/mysql-sandbox to access the MySQL Sandbox, which has the Sakila sample database loaded in a MySQL instance. You’ll have to set up a (free) Katacoda account. Then, click the Start Scenario button. See also: https://dev.mysql.com/doc/index-other.html
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