What is DNS and why do we need it?

DNS (Domain Name System) translates human-readable domain names into IP addresses that computers use to route network traffic. Without DNS, you would need to memorize IP addresses like 142.250.80.46 instead of google.com. DNS is a distributed, hierarchical system — root nameservers know which servers are authoritative for each top-level domain (.com, .org), which then delegate to per-domain authoritative nameservers.

What is DNS propagation and how long does it take?

DNS propagation is the time required for updated DNS records to be visible from all resolvers worldwide. Each DNS record has a TTL (Time-to-Live) that tells caching resolvers how long to store the record. After a change, propagation is complete only when all resolvers that had cached the old record allow their TTL to expire and re-query. With typical TTLs of 3600-86400 seconds, propagation can take 1-48 hours globally.

What is the difference between an A record and a CNAME record?

An A record directly maps a hostname to an IPv4 address (example.com → 93.184.216.34). A CNAME record creates an alias from one hostname to another (www.example.com → example.com). CNAMEs add an indirection step — resolvers must look up the CNAME target and then resolve that target. CNAMEs cannot coexist with other record types at the same node, so they cannot be used at the zone apex (root domain).

How do MX records work for email routing?

MX (Mail Exchange) records specify the mail servers responsible for accepting email for a domain, with priority values (preference numbers). Lower numbers indicate higher priority. Multiple MX records create redundancy: if the primary mail server (priority 10) is unreachable, sending servers try the backup (priority 20). Example: MX 10 mail1.example.com, MX 20 mail2.example.com.

What are SPF, DKIM, and DMARC records?

These TXT records authenticate email to prevent spoofing. SPF (Sender Policy Framework) specifies which servers are authorized to send mail from your domain. DKIM (DomainKeys Identified Mail) provides a cryptographic signature for email headers, verifiable using a public key stored in DNS. DMARC (Domain-based Message Authentication, Reporting, and Conformance) specifies how receivers should handle mail failing SPF or DKIM checks.

DNS Lookup & Domain Inspector

Inspect DNS Records for a Domain

Use this lookup to inspect the public DNS records associated with a hostname. A records map names to IPv4 addresses, AAAA records map to IPv6 addresses, MX records identify mail servers, and TXT records commonly hold SPF, DKIM, verification, or policy text.

Reading common results

A / AAAA: where a hostname resolves for web traffic
CNAME: an alias to another hostname
MX: mail delivery targets and their priorities
NS: authoritative name servers for a zone
TXT: arbitrary text used by ownership and email-security systems

DNS answers are cached according to their TTL, so different resolvers may show changes at different times. An empty answer does not always mean a domain is broken; the requested record type may simply not be configured.

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DNS Lookup & Domain Inspector – DataMorph

Inspect DNS Records for a Domain

Reading common results

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