DNS Lookup Tool

Look up DNS records (A, AAAA, CNAME, MX, TXT, etc.) for any domain name.

Enter Domain Name

About DNS Records

  • A - Maps a domain to an IPv4 address
  • AAAA - Maps a domain to an IPv6 address
  • CNAME - Creates an alias from one domain to another
  • MX - Directs email to a mail server
  • TXT - Stores text information (often for SPF, DKIM)

DNS Lookup Guide

What is a DNS Lookup?

DNS (Domain Name System) lookup is the process of translating a domain name into the corresponding IP address or other DNS record information. DNS functions as the internet's phonebook, allowing users to access websites using human-readable domain names (like example.com) rather than numeric IP addresses (like 93.184.216.34).

Each DNS record type serves a specific purpose in directing traffic, securing communications, or providing information about a domain. DNS lookups are essential for virtually all internet operations, from browsing websites to sending emails and connecting to various online services.

How Does DNS Lookup Work?

The DNS lookup process involves several steps:

  1. Query Initiation: When you enter a domain name in your browser, your device sends a DNS query to a recursive resolver.
  2. Resolver Consultation: The recursive resolver (typically provided by your ISP) checks if it has the information cached. If not, it begins a series of queries.
  3. Root Server: The resolver contacts a root nameserver, which directs it to the appropriate Top-Level Domain (TLD) server.
  4. TLD Server: The TLD server (e.g., for .com domains) directs the resolver to the authoritative nameserver for the specific domain.
  5. Authoritative Nameserver: This server provides the actual DNS record information for the domain.
  6. Response Return: The information is returned back through the chain to your device, which can then connect to the proper IP address.
  7. Caching: Results are typically cached at various levels to speed up future requests.

Common DNS Record Types Explained

A Records

Maps a domain name to an IPv4 address. This is the most common record type and is essential for website hosting.

AAAA Records

Similar to A records but maps to an IPv6 address, the newer standard for IP addressing with a larger address space.

CNAME Records

Creates an alias from one domain name to another, allowing multiple services to use the same IP address.

MX Records

Specifies mail servers responsible for accepting email messages on behalf of a domain and includes a priority value.

TXT Records

Stores text-based information associated with a domain, commonly used for SPF and DKIM email authentication.

NS Records

Delegates a domain or subdomain to a set of name servers, effectively defining which servers provide authoritative information.

SOA Records

Contains administrative information about the domain, including the primary name server and various timeout values.

SRV Records

Specifies the location (hostname and port number) of servers for specific services, commonly used for VoIP and instant messaging.

CAA Records

Specifies which Certificate Authorities (CAs) are allowed to issue SSL/TLS certificates for a domain.

Applications of DNS Lookups

Website Troubleshooting

Identifying DNS misconfigurations or propagation issues when a website isn't accessible.

Email Configuration

Setting up and verifying email service providers through MX, SPF, DKIM, and DMARC records.

Domain Management

Transferring domains between registrars or hosting providers and ensuring proper delegation.

Security Analysis

Investigating suspicious domains or verifying legitimate domain ownership and configuration.

Content Delivery Networks

Setting up and verifying CDN integrations through CNAME records and other configurations.

Service Discovery

Finding available services on a domain using SRV records, commonly used in VoIP and chat applications.

DNS Troubleshooting Tips

When facing DNS-related issues, consider these troubleshooting steps:

  • Check DNS Propagation: DNS changes can take up to 48 hours to propagate globally, though most changes are visible within a few hours.
  • Verify Name Servers: Ensure your domain is pointing to the correct name servers as specified by your hosting provider.
  • Clear Local DNS Cache: Your operating system and browser cache DNS results, which might need clearing after changes.
  • Check Record Syntax: Even small errors in DNS records can cause them to be ignored or misinterpreted.
  • Confirm TTL Values: Time-To-Live values determine how long DNS records are cached. Lower values allow for faster propagation of changes.
  • Use Multiple DNS Tools: Different DNS lookup tools might show different results based on their location and the DNS servers they query.

Frequently Asked Questions (FAQs)

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