What is a DNS checker?

A DNS checker is a tool that queries Domain Name System servers to retrieve and display DNS records for a domain. It helps verify that your domain's DNS configuration is correct, including A records, MX records, NS records, TXT records, and more.

What DNS records can I check?

Our DNS checker can verify A (IPv4), AAAA (IPv6), MX (mail), NS (nameserver), TXT (text including SPF and DMARC), CNAME (canonical name), and SOA (start of authority) records for any domain.

Why should I check my DNS records?

Checking DNS records helps ensure your website resolves correctly, email delivery works properly, SSL certificates can be verified, and security records like SPF and DMARC are configured correctly to prevent email spoofing.

How long do DNS changes take to propagate?

DNS propagation typically takes 24-48 hours to fully complete worldwide, though many changes are visible within a few hours. The TTL (Time To Live) value on your DNS records affects how quickly changes are seen.

DNS Checker Tool

Comprehensive DNS health report with validation and recommendations

Enter Domain Name

Enter a domain name without http:// or www

What is DNS?

DNS (Domain Name System) is the internet's phonebook. It translates human-readable domain names (like myseostack.com) into IP addresses (like 93.184.216.34) that computers use to identify each other on the network. Proper DNS configuration is critical for website accessibility, email delivery, and overall online presence.

DNS Record Types Explained

A Records (IPv4)

Maps a domain name to an IPv4 address. This is the most fundamental DNS record type that tells browsers where to find your website.

AAAA Records (IPv6)

Maps a domain name to an IPv6 address. IPv6 is the newer internet protocol designed to replace IPv4.

MX Records (Mail)

Specifies mail servers responsible for receiving email on behalf of your domain. Priority values determine which servers to try first.

NS Records (Nameservers)

Indicates which DNS servers are authoritative for your domain. You should have at least 2 nameservers for redundancy.

TXT Records

Stores text information for various purposes including email authentication (SPF, DKIM), domain verification, and security policies.

CNAME Records

Creates an alias from one domain name to another. Commonly used for subdomains that point to the main domain or CDN services.

SOA Records

Start of Authority record contains administrative information about the DNS zone, including the primary nameserver and refresh intervals.

DNS Best Practices

Multiple Nameservers

Use at least 2-3 nameservers on different networks for redundancy. If one fails, others can still serve DNS queries.

Low TTL Values

Use lower TTL (Time To Live) values when planning changes, then increase them for stability. Typical values range from 300 seconds (5 minutes) to 86400 seconds (24 hours).

Email Authentication

Implement SPF, DKIM, and DMARC records to protect against email spoofing and improve deliverability.

Regular Monitoring

Monitor DNS records regularly to detect unauthorized changes, misconfigurations, or propagation issues.

IPv6 Support

Add AAAA records for IPv6 support as the internet transitions from IPv4 to IPv6.

Backup MX Records

Configure secondary MX records with higher priority values as backup mail servers.

Frequently Asked Questions

How long does DNS propagation take?

DNS changes can take anywhere from a few minutes to 48 hours to fully propagate worldwide, depending on TTL values and ISP caching policies. Most changes propagate within 4-6 hours.

What is DNS caching?

DNS caching stores DNS query results for a period determined by the TTL value. This reduces DNS lookup time and server load but can delay the visibility of DNS changes.

Why do I need multiple nameservers?

Multiple nameservers provide redundancy. If one nameserver goes down, others can still respond to DNS queries, ensuring your domain remains accessible.

What is an SPF record?

SPF (Sender Policy Framework) is a TXT record that specifies which mail servers are authorized to send email on behalf of your domain. It helps prevent email spoofing.

Can I have multiple A records for one domain?

Yes, multiple A records can be used for load balancing and redundancy. DNS resolvers will typically return all A records, and the client can choose which to use.

What causes DNS errors?

Common causes include incorrect nameserver configuration, expired domains, propagation delays, ISP DNS issues, firewall blocks, or misconfigured DNS records.