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