DNS Tools

TTL Checker

Check the TTL (Time To Live) of a domain's A, AAAA, MX, and NS records.

Enter a domain to check the TTL (Time To Live) of its A, AAAA, MX, and NS records.

More DNS Tools

DNSSEC Checker DNS Lookup SRV Record Lookup A Record Lookup CAA Record Lookup AAAA Record Lookup DNS Propagation Checker MX Record Lookup

JustChecker tracks your DNS records continuously and alerts you the moment something changes.

What Is TTL?

TTL (Time To Live) is the number of seconds a DNS answer may be cached. This tool shows the TTL of a domain's A, AAAA, MX and NS records, so you can predict how long a change will take to reach everyone.

When to Use It

A day before a planned migration, to check whether you should lower the TTL first.
When a DNS change seems slow to take effect.

How to Use It

Enter the domain.
Note the TTL for each record type.

Understanding the Result

3600 is one hour and 86400 is one day. Short TTLs (300 seconds) make changes spread quickly; long TTLs reduce DNS queries. Lower the TTL at least one old-TTL period before a change, then raise it again afterwards.

Limitations

Resolvers count the TTL down, so a cached answer may show a smaller value than the one configured. Compare resolvers with the DNS Propagation Checker.

Frequently Asked Questions

TTL (Time To Live) is how long, in seconds, a DNS resolver is allowed to cache a record before checking again for updates. A lower TTL means changes propagate faster but increases DNS query volume.

For stable records, 3600-86400 seconds (1-24 hours) is common. Before making a DNS change, temporarily lowering TTL to around 300 seconds helps the change propagate faster.

Each DNS record type can have its own independently configured TTL - it's normal for your MX records to have a different TTL than your A records.