DNS Lookup
Look up A, AAAA, CNAME, MX, NS, and TXT records for any domain name — instantly and for free.
What Is a DNS Lookup?
The Domain Name System (DNS) is the internet's directory service, translating human-readable domain names into the machine data that browsers, mail servers, and applications actually need — IP addresses, mail server priorities, name server delegations, and arbitrary verification text. A DNS lookup queries a domain's authoritative name servers directly and returns exactly what's currently published, which is the fastest way to confirm a change has actually propagated rather than guessing from a cached browser result.
When Do You Need One?
Developers use DNS lookups to verify a new A/AAAA record has taken effect after pointing a domain at a new server, confirm CNAME setups for subdomains and CDNs, check MX records before troubleshooting missing email, audit NS records to confirm which registrar or provider actually controls a domain's DNS, and read TXT records to verify SPF/DKIM/DMARC email-authentication setups or domain-ownership verification codes for services like Google Search Console.
Frequently Asked Questions
What's the difference between A and AAAA records?
An A record maps a domain to an IPv4 address (e.g. 192.0.2.1); an AAAA record maps it to an IPv6 address. A domain can have both simultaneously to support dual-stack clients.
Why does a domain have multiple MX records?
Multiple MX records provide mail delivery redundancy. Each has a priority number — lower numbers are tried first — so mail can fail over to a backup server if the primary is unreachable.
Why would my DNS lookup show no results right after I made a change?
DNS changes take time to propagate because resolvers cache records for their configured TTL (time-to-live). Until that TTL expires everywhere, some resolvers will still return the old value.
Can a DNS lookup see records that aren't publicly visible?
No — this tool queries public DNS the same way a browser or mail server does. Anything privately configured (like split-horizon internal DNS) won't appear here.
Related Networking Tools
Related Network Articles
How DNS Lookup Solved a Website Outage
A global e-learning platform suffered a sudden 3-hour outage. Here is the step-by-step breakdown of how DNS propagation diagnostics, TTL misconfigurations, and WHOIS lookup identified the root cause.
How to Check if Your DNS Is Actually Secure
Most people use whatever DNS their ISP assigned them without thinking about it. That default often exposes your browsing history, allows manipulation, and has no privacy protections whatsoever.
DNS Explained: The Internet's Phone Book (Sort Of)
DNS translates domain names into IP addresses. But the 'phone book' analogy misses how much power — and risk — is packed into this one system.