DNS Lookup Tool
Look up DNS records for any domain. View A, AAAA, MX, NS, TXT, and CNAME records with resolution timing and hosting provider identification.
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What is DNS?
The Domain Name System (DNS) translates human-readable domain names like example.com into IP addresses that computers use to connect to each other. DNS is the first step in every web request.
Why is DNS resolution speed important?
DNS resolution is the first step in every web request. Slow DNS adds latency before the browser can even start connecting to the server. Resolution under 100ms is good; over 200ms is slow.
Frequently Asked Questions
A records map a domain to an IPv4 address. AAAA records map to IPv6. MX records specify mail servers. NS records identify the domain's nameservers. TXT records hold text data like SPF, DKIM, and DMARC email authentication policies. CNAME records create aliases from one domain to another.
DNS resolution is the first step in every web request. Slow DNS adds latency before the browser can even start connecting to the server. Resolution under 100ms is good; over 200ms is slow. Using a fast DNS provider (Cloudflare 1.1.1.1, Google 8.8.8.8) and enabling DNS prefetching can help.
SPF (Sender Policy Framework), DKIM (DomainKeys Identified Mail), and DMARC (Domain-based Message Authentication) are email authentication standards stored as TXT records. They prevent email spoofing by verifying that emails claiming to be from your domain actually are.