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Enter a domain name to retrieve its DNS records. Select the record type you want to look up.
Examples:
TTL (Time To Live) is a value in a DNS record that determines how long a DNS record is cached by DNS resolvers before they request a fresh copy from the authoritative DNS server.
TTL is specified in seconds. When you change a DNS record, the change won't be visible to everyone immediately because of caching. The TTL value determines how long this propagation will take.
| TTL Value | Use Case |
|---|---|
| 300 seconds (5 minutes) | Used when you need to make frequent changes and need them to propagate quickly |
| 3600 seconds (1 hour) | Common for records that may change occasionally |
| 86400 seconds (1 day) | Standard for stable records that rarely change |
| 604800 seconds (1 week) | Used for very stable records where changes are infrequent |
When planning DNS changes, it's generally good practice to lower TTL values temporarily before making the change, then raise them back after the change has successfully propagated.
DNS issues can cause websites to become inaccessible or email delivery to fail. Here are some common DNS problems and their solutions:
If a website isn't loading, it might be due to missing or incorrect A/AAAA records.
Solution:
Verify that the domain has correct A or AAAA records pointing to the right IP address. Check for typos or outdated IPs.
If emails aren't being delivered, the problem could be related to MX records.
Solution:
Ensure that the domain has properly configured MX records pointing to the correct mail servers. Check priority values and server names.
If a specific subdomain isn't resolving correctly, it might be missing the necessary records.
Solution:
Add either an A record for the specific subdomain or a CNAME record that points to the main domain or another host.
When troubleshooting DNS issues, remember that changes may not take effect immediately due to TTL values and caching at various levels (browser, OS, ISP).
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The Domain Name System was created in 1983 by Paul Mockapetris.
DNS handles billions of queries every day across the internet.
There are 13 logical root name server clusters that serve the DNS root zone.