DNS lookup.
Ask a public resolver directly and see exactly what comes back: records, TTLs, response codes and how long each query took. Compare resolvers to spot propagation lag or stale caches.
About this tool
Each record type is a real DNS query sent from this server over UDP (falling back to TCP on truncation) to the resolver you pick, with EDNS enabled. Nothing is cached here, so what you see is what that resolver is serving right now. Enter an IP address and it becomes a PTR (reverse) lookup automatically.
Common uses: checking a change has propagated, confirming MX and SPF/DMARC TXT records before a mail cutover, finding a CNAME chain, or reading a zone's SOA serial. NXDOMAIN means the name does not exist; SERVFAIL usually means the authoritative servers are unreachable or DNSSEC failed.
From a terminal: curl "kirkdiamond.com/tools/dns?name=example.com&type=MX&type=TXT" or add &format=json for structured output.