NETWORK DIAGNOSTICS
Check DNS records, name servers and mail routing for a domain or URL through the public DNS resolver you choose.
DNS records tell browsers, email services and other systems where a domain should send traffic. This lookup checks common record types such as A, AAAA, MX, NS, TXT and CNAME.
Use it to troubleshoot a website or email setup, verify a nameserver change, or confirm that a domain points to the intended service.
A DNS lookup asks a DNS resolver for records associated with a domain name. Those records can direct browsers, mail systems and other services to the correct hosts.
Relevant standard: RFC 1035 — Domain Names — Implementation and Specification
Resolvers cache records for their time-to-live period and may reach authoritative servers at different times. A recent DNS change can therefore appear at different times across resolvers.
Relevant standard: RFC 1035 — Domain Names — Implementation and Specification
A records map a name to an IPv4 address, AAAA records map it to IPv6, MX records describe mail exchangers, and NS records identify authoritative name servers.
Relevant standards: RFC 1035 — Domain Names — Implementation and Specification , RFC 3596 — DNS Extensions to Support IP Version 6