DNS is the internet’s directory
DNS converts human-readable names into records that browsers, mail servers and other systems can use. Different record types answer different questions.
The common record types
A records point to IPv4 addresses, AAAA records point to IPv6 addresses, MX records route email, CNAME creates an alias, NS identifies authoritative nameservers, and TXT stores text used for verification and policies such as SPF.
Look up a domain yourself
Use the DNS Lookup and switch between record types. If you are debugging a website, combine it with the SSL Checker and HTTP Status Checker.
DNS changes take time
Resolvers cache records according to TTL values, so a change can take time to appear everywhere. A lookup shows what the resolver used by the tool can see at that moment.
Try the tools: Links in this guide point to free MyLaptopTools utilities that are relevant to the topic.