DNS Lookup
Query A, MX, NS, TXT, SPF, and DMARC records for any domain. Diagnose email deliverability and DNS configuration instantly.
Understanding DNS Records
Map a domain to an IPv4 address. This is how browsers know which server to connect to when you visit a website.
Specify mail servers responsible for receiving email. Each record has a priority -- lower values are tried first.
Identify the authoritative nameservers for a domain. These servers respond to DNS queries for the domain.
Store arbitrary text data for verification, policies, and configuration. Used for SPF, DKIM, and domain ownership proof.
A TXT record that lists IP addresses and servers authorized to send email for your domain. Prevents email spoofing.
Tells receiving mail servers how to handle messages that fail authentication checks (SPF/DKIM). Critical for email security.
Frequently Asked Questions
What is a DNS lookup?
A DNS lookup queries the Domain Name System to find records associated with a domain name. These records include A records (IP addresses), MX records (mail servers), NS records (nameservers), and TXT records (verification and policy data). DNS is the phonebook of the internet that translates human-readable domains into machine addresses.
What are MX records and why do they matter?
MX (Mail Exchange) records specify which mail servers are responsible for receiving email for a domain. Each MX record has a priority value -- lower numbers indicate higher priority. When someone sends an email to your domain, the sending server looks up your MX records to know where to deliver the message. Misconfigured MX records are the most common cause of email delivery failures.
What are SPF and DMARC?
SPF (Sender Policy Framework) is a DNS TXT record that specifies which IP addresses and servers are authorized to send email on behalf of your domain. DMARC (Domain-based Message Authentication, Reporting & Conformance) tells receiving servers how to handle messages that fail SPF or DKIM checks. Together, they prevent email spoofing and phishing attacks using your domain.
Why is my DNS lookup showing no records?
If a DNS lookup returns no records, the domain may not exist, may have expired, or may not have the specific record type configured. For example, a domain used only for a website might have A records but no MX records. Ensure you're entering just the domain name (example.com) without http:// or paths.
Need DNS Management?
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