How to Read TTL Values in DNS Results

TTL values tell resolvers how long to cache a DNS answer. A TTL of 300 means five minutes; a TTL of 3600 means one hour.

Commands to use

dig example.com A

Checklist

1. Read the TTL from the answer section.
2. Expect resolvers to keep old data until the old TTL expires.
3. Lower TTL before planned migrations, not after the problem starts.
4. Use reasonable TTLs after the migration to reduce resolver load.

How to use the result

The DNS answer should be compared with the intended source of truth: registrar delegation, DNS provider zone, hosting target, email provider instructions, certificate authority challenge, or internal network documentation. If they do not match, fix the source record before troubleshooting higher layers.