dig
dig [+short] <name>
Risk: Safe
What it does
Asks DNS, the phone book, for a name. It skips /etc/hosts.
When to use it
To see what the world's phone book says.
Example
$ dig +short kedai.exampleOnly the answer: its number.
$ dig kedai.exampleThe whole reply, with the time to live (TTL).
Learn it in: DNS: dig and /etc/hosts · Official docs