RTT.ICU

About this tool

Perform a free online DNS lookup for A, AAAA, MX, TXT, NS, CNAME, and other record types and verify propagation from global resolvers.

  • Enter the domain you want to resolve.
  • Choose the record type, such as A, AAAA, MX, or TXT.
  • Compare answers from different regions to confirm global propagation.
Frequently asked questions
Which DNS record types can I look up?
The tool resolves A, AAAA, CNAME, MX, TXT, NS, SOA, SRV, and CAA records. A and AAAA map names to IPv4 and IPv6 addresses, MX lists mail servers, and TXT carries verification and SPF records.
Why do different regions return different DNS answers?
DNS changes propagate gradually and geo-DNS services intentionally answer differently by region. Checking several regions tells you whether a recent record change has reached the world or is still cached.
How long does it take for DNS changes to appear?
Records are cached for their TTL, typically 300 to 86400 seconds. After lowering the TTL before a migration, new values usually propagate within minutes to an hour.