DNS Record Lookup

DNS Record Checker

The Domain Name System, or DNS, is the backbone of the internet’s addressing infrastructure. Every time you type a domain name into your browser, DNS translates that human-readable name into the numeric IP address that computers use to locate each other on the network. Think of DNS as the internet’s phone book — without it, you would need to memorize long strings of numbers just to visit a website. DNS records are the individual entries in that phone book, and each type of record serves a different purpose. Checking DNS records is an essential step in diagnosing connectivity issues, verifying domain configurations, and ensuring that services like email and web hosting are properly set up. For a comprehensive overview of the resolution process, read our guide on how DNS works.

Understanding DNS Record Types

Each DNS record type carries specific information about a domain. For a detailed breakdown of every record type, see our companion article on DNS records explained. Here are the most commonly queried types and what they do:

• A records map a domain name to an IPv4 address. This is the most fundamental DNS record — it tells browsers which server to contact when someone visits your website.
• AAAA records serve the same purpose as A records but for IPv6 addresses. As the internet transitions to IPv6, these records are becoming increasingly important for ensuring your site is reachable on modern networks.
• MX records (Mail Exchanger) specify which mail servers handle email for a domain. If your emails are not being delivered, checking MX records is often the first troubleshooting step.
• TXT records hold arbitrary text data and are widely used for domain verification, SPF (Sender Policy Framework) policies, DKIM signatures, and DMARC rules. They play a critical role in email authentication and preventing spoofing.
• CNAME records (Canonical Name) create an alias from one domain name to another. They are commonly used to point subdomains like www.example.com to the root domain or to a CDN hostname.
• NS records (Name Server) identify which DNS servers are authoritative for a domain. These records are essential during domain migrations and when delegating subdomains to different hosting providers.

Common Use Cases for DNS Lookups

Running a DNS lookup is one of the first things network administrators and webmasters do when something goes wrong. During a domain migration, verifying that A records and NS records have propagated to the new hosting provider ensures a seamless transition with minimal downtime. When troubleshooting email delivery issues, checking MX records confirms that mail is being routed to the correct mail server, while inspecting TXT records reveals whether SPF and DKIM policies are properly configured. For SSL certificate validation, certificate authorities often require you to add a specific TXT or CNAME record to prove domain ownership — a quick DNS checker confirms the record is in place before you request the certificate. Whether you are a developer setting up a new project, a system administrator auditing infrastructure, or a site owner verifying that everything is configured correctly, this DNS record checker gives you instant visibility into the records that keep your domain running. For more diagnostic techniques, see our network troubleshooting guide.

Related Tools & Resources

Need to go the other direction? Use our Reverse DNS Lookup to resolve an IP address back to its hostname. You can also check your own IP address, calculate subnet details, or browse common network ports. Visit the networking tools hub for the full collection.