What is DNS Lookup?
DNS (Domain Name System) is the internet's phone book - it translates human-readable domain names like "google.com" into IP addresses that computers use to communicate. A DNS lookup queries this system to retrieve the various records associated with a domain.
This free DNS lookup tool allows you to query all standard DNS record types including A records (IPv4 addresses), AAAA records (IPv6), MX records (mail servers), NS records (nameservers), TXT records (verification and configuration), CNAME records (aliases), SOA records (zone authority), and more.
Whether you're troubleshooting email delivery issues, verifying DNS propagation after making changes, or analyzing a domain's infrastructure, this tool provides comprehensive DNS information in an easy-to-read format.
DNS Record Types Explained
A Record
Maps a domain to an IPv4 address (e.g., 192.168.1.1). The most fundamental DNS record - every website needs at least one A record.
AAAA Record
Maps a domain to an IPv6 address. Essential for modern internet infrastructure as IPv4 addresses become scarce.
MX Record
Specifies mail servers for the domain with priority values. Lower priority numbers are tried first. Essential for email delivery.
NS Record
Identifies the authoritative nameservers for a domain. These servers hold the official DNS records and answer queries.
TXT Record
Stores text data for various purposes: SPF (email authentication), domain verification, DKIM signatures, and custom configurations.
CNAME Record
Creates an alias pointing one domain to another. Useful for subdomains like www.example.com pointing to example.com.
SOA Record
Start of Authority - contains zone metadata including primary nameserver, admin email, serial number, and timing values.
CAA Record
Certificate Authority Authorization - specifies which CAs can issue SSL certificates for the domain. Important for security.
SRV Record
Service records specify servers for specific services like SIP, XMPP, or LDAP with port numbers and priorities.
Common Use Cases
Troubleshooting Email Delivery
Check MX records to verify mail server configuration, inspect TXT records for SPF/DKIM/DMARC authentication, and diagnose why emails might be bouncing or going to spam.
Verifying DNS Propagation
After changing DNS records, verify the new values have propagated. DNS changes can take up to 48 hours to propagate globally, though most update within hours.
Security Auditing
Review CAA records for certificate policies, check for proper SPF/DMARC configuration, and identify potential DNS misconfigurations that could be exploited.
Domain Migration
Document existing DNS records before migration, verify all records are properly transferred to the new provider, and troubleshoot any issues after the switch.