Look up MX record

Which lookup for what?

One resolver shows what a large public resolver is currently returning. Compare shows whether a change has arrived everywhere. Authoritative name server shows the current state at the source, without caching. If the authoritative name server already returns the new value but the resolvers still return the old one, you just need to wait for the time (TTL) to pass.

A record

IPv4 address at which a domain can be reached.

AAAA record

IPv6 address of a domain.

MX record

Mail servers that accept e-mail for the domain, with priority (lower number first).

TXT record

Free-text records, such as SPF, DMARC or verifications for Google and Microsoft.

NS record

Name servers responsible for the domain.

CNAME record

Reference to another name (alias).

SOA record

Administrative data of the zone: primary name server, contact, serial number, timers.

CAA record

Which certificate authorities may issue TLS certificates for the domain.

PTR record

Reverse lookup: which hostname belongs to an IP address.

SRV record

Services with port, e.g. for SIP telephony, Microsoft Teams or Autodiscover.

DS record

DNSSEC: link between the zone and its parent zone.

DNSKEY record

DNSSEC: public keys of the zone.