Question 1

What does the Reverse DNS Lookup tool do?

Accepted Answer

The Reverse DNS Lookup tool queries public DNS resolvers to retrieve Reverse DNS records for any domain. Results include the full record value, TTL (Time-to-Live), and any associated metadata. This is useful for verifying DNS configuration, troubleshooting email delivery issues, auditing third-party services linked to a domain, and checking propagation after a DNS change.

Question 2

How do I check if my DNS changes have propagated?

Accepted Answer

After publishing a DNS change, records propagate across global DNS servers over a period of minutes to 48 hours depending on TTL. Use our DNS Propagation Checker to query multiple resolvers worldwide simultaneously and confirm your new record is live. If you see old values, local or upstream caching may be the cause — wait for TTL to expire or flush your local DNS cache (ipconfig /flushdns on Windows, sudo dscacheutil -flushcache on macOS).

Question 3

What is TTL in DNS and how does it affect propagation?

Accepted Answer

TTL (Time-to-Live) is a value in seconds that tells DNS resolvers how long to cache a record before re-querying the authoritative DNS server. A low TTL (e.g. 300 seconds / 5 minutes) means changes propagate faster. A high TTL (e.g. 86400 seconds / 24 hours) means resolvers may cache old values longer after a change. Before making important DNS changes, reduce TTL to 300 seconds at least 24 hours in advance, make the change, then restore the TTL.

Question 4

What is the difference between authoritative and recursive DNS?

Accepted Answer

An authoritative DNS server holds the actual DNS records for a domain and gives the definitive answer when queried. A recursive DNS resolver (such as 8.8.8.8 or 1.1.1.1) accepts queries from clients and fetches answers from authoritative servers on their behalf, caching results for the TTL duration. When you check DNS using our tool, we query multiple resolvers to show you what the rest of the internet currently sees for a given record.

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