whatsmydns.net - DNS Propagation Checker
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DNS Checker

Interpreted as: How do I check DNS records and propagation?

When a domain name has DNS records changed these changes do not happen immediately, the changes first need to propagate around the world to many different servers and eventually through to your ISP or the DNS resolvers that your computer is configured to use which can make it hard to check DNS changes.

Since this process has to go through so many servers around the Internet, it can sometimes take quite a long time to fully propagate - sometimes up to 72 hours, but it is usually much shorter.

When you're making changes it is handy to know if the changes have become active in other parts of the world, whatsmydns.net is a DNS Checker that lets you do exactly this - check DNS propagation.