See every important DNS record for a domain — addresses, mail servers, nameservers and TXT records — in one query.
A / AAAA records point your domain at a server's IPv4/IPv6 address — if these are wrong, your site is unreachable. CNAME aliases one name to another. MX records route your email; a missing MX means bounced mail. NS records name the DNS servers that answer for your domain, and TXT records carry verification and email-security entries like SPF and DKIM.
After a DNS change, records can take minutes to hours to propagate. If your site just went down after a DNS edit, check the A record here first — then use our website down checker to confirm reachability, or let PingDeck watch it continuously.
Diagnosing mail delivery? This tool doubles as an email DNS checker — an online nslookup for MX records showing exactly where a domain's mail is routed, alongside the TXT records (SPF, DKIM, DMARC) that decide whether messages land in the inbox. If MX records are missing or point at the wrong host, mail bounces: that is the first thing to check.