Record types
- A and AAAA: the IPv4 and IPv6 addresses for a name.
- CNAME: an alias pointing at another name.
- MX: mail servers, with priority (lower is tried first).
- NS and SOA: the nameservers for the zone and its administrative settings.
- TXT: free text, used for SPF, DMARC, domain verification.
- CAA: which certificate authorities may issue certificates.
- SRV: services such as SIP or XMPP with host and port.
- DS and DNSKEY: DNSSEC keys.
About the TTL
The time to live is how long resolvers may cache the answer. A resolver that already cached it returns the remaining time, counting down, so the number you see can be lower than what is set at the DNS host.
Questions
- Why do I get no records?
- NOERROR with no answer means the name exists but has no record of that type. NXDOMAIN means the name does not exist at all.