Complete Internet Research Toolkit
Fast, Free & Accurate WHOIS, DNS, IP, RDAP, MX, Nameserver, Web History Lookup for Any Domain
Research any domain with WHOISDR’s free WHOIS and DNS lookup tools. Check available domain registration details, registrar information, creation and expiration dates, nameservers, domain status, IP-related DNS records, mail servers, TXT records, CNAME records and more.
Start with the signal you need
Move from a single domain name to registration, DNS, network and web infrastructure context in a few clicks.
Unlock Domain Mysteries with WHOISDR.COM
Discover what’s behind any domain with WHOISDR. Our free domain research tools make it easy to find and understand WHOIS registration data and DNS records.
Use our WHOIS Lookup to check available registrar information, domain creation and expiration dates, status, and nameservers. Use our DNS Lookup to examine A, AAAA, MX, NS, TXT, CNAME, and SOA records.
Whether you’re researching a domain before buying it, troubleshooting DNS, identifying mail servers, checking nameservers, or investigating how a website is configured, WHOISDR puts useful domain information at your fingertips—free, fast, and without an account.
How to Look Up WHOIS & DNS Records
Enter a Domain Name
Enter the domain you want to research, such as example.com. Choose WHOIS Lookup to explore available domain registration information or DNS Lookup to inspect the domain’s current DNS configuration. No account or registration is required.
Choose What to Check
Looking for a domain’s registrar, registration date, expiration date, status, or nameservers? Choose WHOIS. Need A, AAAA, MX, NS, TXT, CNAME, or SOA records? Choose DNS. WHOISDR gives you the right lookup for the information you need.
Review Your Results
Get an easy-to-read view of the available domain data. Use the results to research a domain before buying it, troubleshoot DNS problems, identify nameservers and mail servers, verify DNS settings, or better understand how a website is configured.
Free Domain Research & DNS Tools
WHOIS Domain Lookup
Look up available WHOIS registration data for a domain, including its registrar, registration and expiration dates, domain status, and authoritative nameservers. A useful starting point for researching the history and registration of a domain name.
DNS Record Lookup
Examine a domain’s DNS configuration and find records such as A, AAAA, MX, NS, TXT, CNAME, and SOA. Use DNS lookup results to investigate where a domain points, how its email is routed, and which nameservers manage its DNS.
Domain Registration Details
Research important domain registration details such as the registrar, creation date, expiration date, update date, domain status codes, and nameservers when available. Registrant information may be hidden or redacted by privacy services.
Nameserver & DNS Research
Find the authoritative nameservers associated with a domain and explore the DNS records that help connect it to websites, email providers, verification services, and other Internet infrastructure. Useful for DNS troubleshooting and technical research.
Email & Mail Server Lookup
Check MX records to identify the mail servers responsible for receiving email for a domain. You can also inspect TXT records commonly used for email authentication, domain verification, and other services configured through DNS.
Fast, No-Account Lookups
Research public domain and DNS information directly from your browser without creating an account. WHOISDR keeps domain research simple for website owners, developers, IT professionals, domain buyers, students, and anyone investigating a domain.
Understand Any Domain with WHOIS & DNS Data
WHOISDR helps you investigate the public registration and DNS information behind domain names. Use our free tools to research a domain before you buy it, confirm registration details, troubleshoot DNS, inspect mail routing, identify nameservers, and better understand how a website is configured.
What Is a WHOIS Lookup?
A WHOIS lookup is a search for publicly available information associated with a domain registration. Depending on the domain extension, registry, registrar, privacy rules, and available registration data, a lookup may show the domain registrar, creation date, expiration date, updated date, domain status codes, and authoritative nameservers.
WHOIS is still the familiar term people use for domain registration searches, although modern registration data for many domains may be delivered through newer systems such as RDAP. The practical goal is the same: enter a domain name and retrieve the registration information that is publicly available.
A WHOIS search can be useful when you want to check when a domain was registered, see when its current registration term expires, identify the registrar, research an unfamiliar domain, or gather background information before a domain purchase. Registrant names and contact details are often redacted or unavailable, so a lookup should not be treated as a guaranteed way to identify a person behind a website.
Run a Free WHOIS LookupWhat Is a DNS Lookup?
A DNS lookup retrieves records published through the Domain Name System. DNS is the distributed system that helps connect human-friendly domain names with the technical information used by websites, email services, applications, and other Internet resources.
Different DNS record types answer different questions. An A record can map a hostname to an IPv4 address, while an AAAA record can provide an IPv6 address. MX records identify mail exchangers, NS records identify authoritative nameservers, CNAME records create aliases between hostnames, and TXT records can publish verification or email-authentication information.
DNS lookups are especially useful when a website points to the wrong server, email stops arriving, a verification record cannot be found, a subdomain is misconfigured, or you simply want to understand the public-facing infrastructure behind a domain.
Check DNS RecordsHow Domain Research Works
A useful domain investigation usually combines registration information with live DNS data instead of relying on a single field.
1. Start with the Domain
Enter the exact domain or hostname you want to research. Small differences matter: example.com, www.example.com, and mail.example.com can return different technical information.
2. Check Registration Data
Use WHOIS to review available registrar information, registration dates, status codes, and nameservers. These details give you context about the domain registration without claiming more than the public data actually shows.
3. Inspect DNS Records
Use DNS to see how the domain is configured right now. Address, mail, nameserver, alias, and text records can reveal how websites, email, and other Internet services are connected.
What Can You Learn About a Domain?
Domain research becomes more useful when registration data and DNS information are viewed together. Here are some of the most common details you can investigate with WHOISDR.
Registrar Information
Find the registrar associated with a domain registration when that information is available. This can help you understand where the registration is managed and provides useful context during domain research.
Creation & Expiration Dates
Check available creation, updated, and expiration dates. These dates can help you estimate domain age and monitor the current registration term, although they do not provide a complete ownership history.
Nameservers
Identify the authoritative nameservers associated with a domain. Nameservers indicate where authoritative DNS information is hosted and are often the first thing to check when DNS changes appear to have no effect.
A, AAAA & CNAME Records
See how hostnames are connected to Internet resources. A and AAAA records can return IPv4 and IPv6 addresses, while CNAME records can show when one hostname acts as an alias for another.
MX & Email DNS
Check MX records to see which mail servers receive email for a domain. TXT records may also contain SPF, DKIM-related, DMARC, verification, or other email and service configuration data.
Domain Status & Context
Registration results may include status codes related to transfers, updates, deletion, or other registry operations. Combined with DNS data, they can provide a broader snapshot of a domain at the time of your lookup.
DNS Record Types at a Glance
DNS records serve different purposes. This quick reference can help you understand what you are seeing in a lookup result.
| Record | What it does | Common reason to check it |
|---|---|---|
| A | Maps a hostname to an IPv4 address. | Find where a website or service points over IPv4. |
| AAAA | Maps a hostname to an IPv6 address. | Check IPv6 configuration or diagnose IPv6-specific issues. |
| CNAME | Makes one hostname an alias of another hostname. | Verify subdomain, SaaS, CDN, or hosted-platform connections. |
| MX | Identifies mail exchangers for a domain. | Find mail servers or troubleshoot incoming email. |
| NS | Identifies authoritative nameservers. | Confirm which DNS provider is authoritative for the zone. |
| TXT | Publishes text-based DNS information. | Inspect verification, SPF, DKIM-related, DMARC, and other policy data. |
| SOA | Provides authority and administrative information for a DNS zone. | Review zone-level metadata and authoritative DNS details. |
| PTR | Associates an IP address with a hostname in reverse DNS. | Investigate reverse DNS, mail-server configuration, or network identity. |
DNS configurations vary. A domain does not need to publish every record type, and some provider-specific features may behave differently from conventional DNS records.
WHOIS vs. DNS: What’s the Difference?
WHOIS and DNS are often mentioned together because both involve domain names, but they answer different questions. WHOIS or registration data focuses on the domain registration itself. It can help you find the registrar, important registration dates, status information, and nameservers when available.
DNS data focuses on how the domain is configured for Internet services. It can show where a hostname resolves, which servers handle email, which nameservers are authoritative, whether a hostname points to another hostname, and what text-based verification or policy information has been published.
For a more complete investigation, start with a WHOIS lookup to understand the registration, then run a DNS lookup to inspect the technical configuration.
Use WHOIS when you want to check:
- Registrar information
- Domain creation date
- Expiration date
- Domain status
- Nameservers
Use DNS when you want to check:
- A and AAAA records
- MX mail servers
- NS records
- TXT records
- CNAME and SOA records
Common Reasons to Research a Domain
WHOISDR is designed for practical research and troubleshooting, not just curiosity. These are some of the most common ways domain data can be useful.
Research a Domain Before Buying It
Before purchasing a domain from another party, check the registrar, registration dates, status, and nameservers. These details do not prove ownership or guarantee a safe transaction, but they can add useful context to your due diligence.
Troubleshoot Website DNS
If a website suddenly stops loading after a hosting change, inspect its A, AAAA, CNAME, and NS records. A domain can be registered correctly while still pointing to the wrong server or using unexpected nameservers.
Check Email Routing
If email is not arriving, MX records are an important place to start. They identify the mail exchangers responsible for receiving email, while TXT records can provide additional information related to verification and email authentication.
Investigate an Unfamiliar Domain
Registration and DNS information can provide useful background when you encounter a domain you do not recognize. Treat the results as research signals rather than a definitive test of whether a website is safe or trustworthy.
Verify a DNS Change
After changing hosting, email, verification, or nameserver settings, compare the public DNS response with the values you intended to publish. This is often more useful than relying only on what a control panel says is configured.
Learn How a Domain Is Configured
Students, developers, administrators, and website owners can use real-world DNS data to understand how domains connect to web servers, mail services, nameservers, verification systems, and third-party platforms.
Understanding Domain Registration Dates
Creation date, updated date, and expiration date describe different parts of the registration record. A creation date can help estimate how long the current registration has existed, while the expiration date shows the end of the currently reported registration term.
These dates should not be over-interpreted. An old domain can change owners, a business can be older than its current domain, and an expiration date does not mean the domain becomes publicly available on that exact day.
If you manage your own domain, use your registrar account as the primary source for renewal decisions. A public lookup is useful for research, but it is not a substitute for account-specific renewal information.
Why WHOIS Information May Be Redacted
Public domain registration data has changed significantly over time. Personal registrant information that once appeared openly in many WHOIS responses is now often redacted, privacy-protected, or unavailable.
That means a lookup may still show useful registrar, date, status, and nameserver information even when it does not reveal a person’s name, postal address, telephone number, or email address.
WHOISDR presents available public registration information for research purposes and avoids treating hidden registrant details as evidence that a website is suspicious.
A Practical DNS Troubleshooting Checklist
When a domain-related service stops working, checking records in a consistent order can save time.
Website Not Loading?
- Check the authoritative NS records.
- Inspect A and AAAA records.
- Check CNAME records for subdomains.
- Compare live results with your host’s required values.
- Consider TTL and cached DNS answers if the change is recent.
Email Not Arriving?
- Check the MX records and priorities.
- Confirm each MX hostname resolves.
- Inspect relevant TXT records.
- Verify that old mail-provider records are not still active.
- Confirm you edited the authoritative DNS zone.
Verification Failing?
- Query the exact hostname the service specified.
- Check the TXT or CNAME value character by character.
- Make sure the domain was not appended twice by your DNS panel.
- Check public DNS, not only the provider dashboard.
- Allow for caching if the record was just created.
Domain & DNS Glossary
A few terms you will see frequently when researching domains and DNS.
Domain Registrar: the company through which a domain registration is managed.
Registry: the operator responsible for the database of a top-level domain or group of domains.
Registrant: the person or organization associated with a domain registration when that information is available.
Nameserver: a DNS server that can provide authoritative information for a DNS zone.
TTL: Time to Live, which controls how long DNS information may be cached before it should be refreshed.
Zone Apex: the root of a DNS zone, such as example.com rather than a subdomain like www.example.com.
Recursive Resolver: a DNS service that finds answers on behalf of clients and commonly caches them.
Authoritative DNS: the DNS source responsible for providing authoritative answers for a zone.
RDAP: Registration Data Access Protocol, a standardized system used to provide registration data for many Internet resources.
WHOIS & DNS Frequently Asked Questions
Quick answers to common questions about domain registration and DNS lookup.
What is a WHOIS lookup?
A WHOIS lookup retrieves publicly available domain registration information. Depending on the domain and available data, results may include the registrar, registration dates, domain status, nameservers, and other registration details.
Can WHOIS tell me who owns a domain?
Sometimes registrant information may be available, but it is frequently redacted or protected. A WHOIS lookup should not be treated as a guaranteed way to discover a person’s name, address, phone number, or email address.
How can I check when a domain was registered?
Run a WHOIS lookup and look for a creation or registration date. This can help estimate the domain’s current registration age, but it does not necessarily show when the current website launched or when the current registrant acquired it.
How can I check when a domain expires?
Registration results often include an expiration or registry expiry date. Remember that an expired domain does not necessarily become available immediately because renewal, grace, redemption, auction, or deletion stages may still apply.
Can domain age tell me whether a website is trustworthy?
No. Domain age is useful context, but an old domain can change owners and a new domain can belong to a legitimate organization. Do not use age alone as a safety or reputation verdict.
Why can’t I see the registrant’s contact details?
Public registration data frequently redacts personal information because of privacy requirements, registry policies, and registrar practices. Useful registration fields may still be available even when personal contact data is hidden.
What is a DNS lookup?
A DNS lookup retrieves records published through the Domain Name System. Depending on the query, these can include A, AAAA, MX, NS, TXT, CNAME, SOA, and other DNS record types.
How do I find a domain’s mail servers?
Check the domain’s MX records. MX records identify the mail exchangers responsible for receiving email for the domain and may also provide clues about the email infrastructure in use.
Why are my DNS changes not showing?
Possible causes include DNS caching, TTL values, editing records at the wrong DNS provider, or checking the wrong hostname. Confirm the authoritative NS records and compare the live DNS response with the values you expect.
Can DNS tell me who hosts a website?
DNS can provide infrastructure clues, but the returned IP address may belong to a CDN, reverse proxy, cloud platform, or load balancer rather than the origin server. Treat DNS as a technical signal, not definitive hosting ownership data.
Is WHOIS the same as DNS?
No. WHOIS or registration data describes the domain registration, while DNS describes how hostnames and Internet services are configured. Using both gives you a broader view of a domain.
Is WHOISDR free to use?
WHOISDR provides browser-based WHOIS and DNS lookup tools without requiring an account. Enter a domain, choose the type of lookup you need, and review the available results.
Learn More in the WHOISDR Blog
Domain and DNS data becomes much more useful when you understand what the fields mean. The WHOISDR Blog contains practical guides about WHOIS lookups, DNS records, domain age, domain expiration, nameservers, MX records, TXT records, CNAME records, and other Internet infrastructure topics.
If a lookup result contains something unfamiliar, visit the blog for a plain-language explanation before changing your DNS or drawing conclusions from the data.
Popular Research Topics
- How WHOIS lookup works
- How to check domain age and expiration
- A records vs. CNAME records
- MX records and email DNS
- TXT, SPF, DKIM, and DMARC
- Nameservers and NS records
Start Your Domain Research
Check the registration behind a domain or explore the DNS records that connect it to websites, email, nameservers, and other Internet services.
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