DNS lookup
One name, two of the internet's most-used resolvers, side by side. After a DNS change this answers the question that actually matters: has the new record reached the resolvers your visitors use, or are they still being handed the old one?
What does this lookup actually do?
It asks the same question of two independent public resolvers at once - Cloudflare's 1.1.1.1 and Google's 8.8.8.8 - and shows both answers with their TTLs. The queries run from this site's edge over encrypted DNS. Asking one resolver tells you what one cache thinks; asking two tells you whether the internet currently agrees about your record, which is the question behind almost every "did my DNS change work" moment.
The resolvers disagree. Is that bad?
Usually it is a change in flight. Resolvers hand out cached answers until the record's TTL runs out, and their caches empty at different moments - so right after a change, one resolver can have the new record while the other still serves the old one. The TTL shown next to each answer is that resolver's remaining countdown; once it expires, the resolver re-asks and picks up your change. If the answers still differ long after the old TTL has passed, look for a real cause: the record was changed at one DNS provider while the domain's NS records point at another, or an old record was left behind at a secondary.
One honest caveat: for big CDN-fronted sites, differing A or AAAA answers can be normal. CDNs deliberately answer DNS queries differently by region and by moment, so two resolvers seeing two IPs is not evidence of a problem - the "answers differ" line here is a prompt to look, not a verdict.
Which record type should I look up?
A and AAAA are the addresses browsers connect to (IPv4 and IPv6 - a broken AAAA is how a site ends upup for you, down for others).CNAME is an alias pointing one name at another - common onwww and on anything hosted by a platform. MX is where the domain's mail goes. TXT carries verification strings and mail policy (SPF, DKIM, DMARC). NS names the servers that hold the whole zone - when NS is wrong, every other record is a question mark, andNXDOMAIN errors follow.
What this page does with the name you enter
The name goes from this site's edge to the two resolvers as an encrypted DNS query - that is the lookup - and nowhere else. Your IP address is not forwarded to either resolver; they see this site's Worker asking, not you. Nothing you look up is logged by this page, stored, or added to any list.
A lookup is a snapshot; DNS problems rarely announce themselves while you happen to be looking. A deleted record, an expired domain, or a bad change at your registrar takes your site down just as thoroughly as a crashed server -YoPingMe checks your site from two regions you pick, free, and a DNS failure surfaces as the check failing, from everywhere, at once. The first check runs while you sign up.