Free Webmaster Tool

Free DNS Lookup Tool

Check the publicly available DNS records for any domain. Look up IP addresses, mail servers, nameservers, aliases and text records to help troubleshoot domain, website and email configuration.

Querying DNS servers across public resolvers…

Understanding DNS Records & How Domain Lookup Works

The Domain Name System (DNS) acts as the address book of the Internet. When you type a domain like cymerit.com into your browser, DNS translates that human-friendly name into a machine-readable IP address so your device can connect to the target web server.

Cymerit's Free DNS Lookup Tool queries high-speed public DNS resolvers (Cloudflare 1.1.1.1, Google 8.8.8.8, or authoritative systems) using secure DNS-over-HTTPS (DoH). It parses and categorizes every record returned, helping system administrators, website owners, and developers diagnose domain routing, SSL certificate setup, and email delivery.

Core DNS Record Types Explained

A Record

A

Maps a hostname directly to an IPv4 address (e.g., 162.251.85.103). Essential for pointing domains to standard web hosting servers.

AAAA Record

AAAA

Maps a domain to a modern 128-bit IPv6 address. Essential for next-generation network routing and mobile carriers.

MX Record

MX

Designates the Mail Exchange servers responsible for accepting incoming emails for the domain, with priority weights.

CNAME Record

CNAME

Creates an alias pointing one domain name to another canonical hostname (e.g., pointing www.example.com to example.com).

TXT Record

TXT

Holds arbitrary text data, primarily used for email authentication (SPF, DKIM, DMARC) and third-party domain ownership verification.

NS Record

NS

Delegates a domain zone to authoritative Nameservers that contain the definitive DNS database records for the domain.

SOA Record

SOA

Start of Authority contains core administrative information including the primary nameserver, admin email, zone serial, and refresh timers.

CAA Record

CAA

Specifies which Certificate Authorities (CAs) like Let's Encrypt, DigiCert, or Sectigo are authorized to issue SSL/TLS certificates for the domain.

SRV Record

SRV

Defines the hostname and port for specific services (SIP, VoIP, XMPP, Office 365 Autodiscover) using format _service._proto.name.

PTR Record

PTR

Pointer / Reverse DNS resolves an IP address back to its verified domain name, widely required by spam filters for mail servers.

Practical Troubleshooting Guidance

Fixing Email Delivery Issues

  • Verify your MX records point to your active mail host (e.g., Cymerit Business Email, Google Workspace, or Microsoft 365).
  • Check your TXT SPF record: ensure it contains v=spf1 and includes all authorized sending servers.
  • Ensure multiple SPF records are not published, as having more than one causes permanent SPF validation failure (PermError).

Domain Not Pointing to Web Hosting

  • Confirm your A record matches the shared or dedicated IP address assigned in your hosting cPanel or control panel.
  • If using a CDN or cloud proxy like Cloudflare, check that both root @ and www records are configured.
  • Verify nameserver delegation with the NS records to ensure your registrar points to active DNS servers.

DNS Propagation & TTL Delays

  • The TTL (Time to Live) dictates how long resolvers cache record values before querying authoritative servers again.
  • If you recently updated DNS settings, wait until the old TTL period expires (commonly 300 to 86,400 seconds) for global updates.
  • Check multiple public resolvers (Cloudflare vs Google) using this tool to see if changes have propagated across networks.

Frequently Asked Questions

What is a DNS lookup?

A DNS lookup is the query process of finding the DNS records associated with a domain name. It returns details like the server IP addresses hosting the website (A/AAAA records), the mail servers handling email (MX records), and verification strings (TXT records).

Why does the tool show "No records found" for a specific record type?

Not all domains utilize every DNS record type. For example, if a domain does not send or receive email, it will not have MX records. Similarly, domains without IPv6 hosting will return empty AAAA records. An empty result simply means the domain does not publish records for that specific type.

What does NXDOMAIN mean?

NXDOMAIN stands for Non-Existent Domain. When a DNS resolver returns NXDOMAIN, it indicates that the queried domain name is not registered or has no active zone configuration in the global DNS root and top-level domain (TLD) registry.

How long does it take for DNS changes to take effect?

DNS propagation typically takes anywhere from a few minutes up to 24–48 hours, depending on the TTL (Time to Live) value set on the previous records and caching policies of Internet Service Providers (ISPs).

How do I test Reverse DNS (PTR)?

Enter an IP address (such as 8.8.8.8) into the search field and select the PTR record type. Our tool automatically converts the IP address into the appropriate reverse DNS zone format (8.8.8.8.in-addr.arpa) and queries the reverse pointer record.

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