; dns learning hub

Learn DNS

From how a browser finds a website to configuring email authentication — everything you need to understand DNS, explained clearly.

Every time you visit a website, your device performs a DNS lookup — often in milliseconds. Here is exactly what happens behind the scenes.

Root nameserver clusters

~50ms

Typical cold lookup time

1500+

TLD nameservers worldwide

99.9%

DNS uptime expectation

; resolution walkthrough

You enter example.com in your browser. Your operating system first checks its local DNS cache. If it has a recent answer, the lookup ends here — no network request needed.

The OS cache stores recent DNS answers for their TTL duration. This is why DNS changes can take time to propagate — old answers are cached everywhere.

; put it into practice

DNS LookupQuery all 8 record types for any domain in one shot.Open tool →Health CheckRun 8 parallel diagnostics and get a health score.Open tool →Propagation CheckSee which regions have picked up your latest changes.Open tool →