What this tool does
Enter a domain and pick a record type, and SYNAPSE queries it from both Google and Cloudflare public resolvers. You get every matching record with its TTL, whether the two resolvers agree, and whether the response is DNSSEC-authenticated. It's the quick online equivalent of dig or nslookup, with no client to install.
When Google and Cloudflare disagree
If the two resolvers return different answers, the record is almost always mid-propagation: you changed it recently and one resolver still holds the old value in cache until its TTL expires. That's normal, and waiting out the old TTL resolves it. For a wider view across dozens of locations, use the DNS Propagation checker. Keep in mind a resolver returns whatever is currently cached, not necessarily the authoritative answer, so right after a change the fastest way to see the new value everywhere is a low TTL set in advance.
Frequently asked questions
Which record types can I look up?
A, AAAA, CNAME, MX, TXT, NS, SOA, CAA, and PTR. Pick the type from the dropdown and SYNAPSE resolves it for you.
Why query two resolvers?
Different resolvers can have different cached answers, especially right after a change. Comparing Google and Cloudflare shows whether the record is consistent everywhere or still propagating.
What is TTL?
Time to live is how long a resolver caches a record before re-fetching it. Lower TTLs propagate changes faster; higher TTLs reduce DNS traffic but slow updates.
I just changed a record and don't see it. Why?
Resolvers cache the previous value until its TTL runs out, so a fresh change can take anywhere from minutes to hours to appear depending on the old TTL. Lower the TTL before making planned changes, and check the DNS Propagation tool to see which locations have picked up the new record.