About domains and DNS
Registration data describes domain management; DNS describes name resolution. Start with DNS and DNS Lookup, then follow your task to records such as TXT and MX or to DNSSEC validation results. Use Domain Information Lookup for registration details, DNS Lookup for records, Reverse DNS for names associated with an IP, and DNSSEC Check for validation status.
What is a domain name?
Domain hierarchy, registrable domains, and public suffixes.
What is DNS?
How DNS associates domain names with IP addresses and other information.
What is a DNS lookup?
How DNS record queries work and how to read their results.
What is an A record?
A DNS record that maps a hostname to an IPv4 address.
What is an AAAA record?
A DNS record that maps a hostname to an IPv6 address.
What is a CNAME record?
A DNS record that maps one name to another canonical name.
What is an MX record?
A DNS record that identifies mail servers and their priority.
What is a TXT record? Reading and checking multiple records
Learn Name, Value, and TTL, the difference between records and split strings, and how to check TXT in NetKarte.
What is an NS record?
A DNS record identifying a zone's authoritative name servers.
What is a CAA record?
A DNS record authorizing certificate authorities to issue certificates.
What is an SOA record?
A record containing DNS zone administration data and timers.
Reverse DNS: how to look up PTR records and read results
Look up an IP, read multiple or missing PTR records, and distinguish reverse lookup from forward confirmation.
What is a PTR record?
The DNS record that maps an IP address to a hostname for reverse lookup.
What is a registrar?
The organization through which users register domain names.
What is a registry?
The organization maintaining registration data for a top-level domain.
What is a nameserver?
Authoritative nameservers that direct clients to a domain's DNS data.
DNSSEC: understanding validation results and their limits
Understand valid, unsigned, failed, and indeterminate results, DS and DNSKEY, and differences from registration data.
Domain status: transfer locks versus DNS suspension
Distinguish EPP codes from WHOIS labels and investigate transfer restrictions or DNS publication.