Free DNS, WHOIS & Domain Tools
Run DNS lookups, WHOIS searches, SSL checks, blacklist scans, IP lookups, and full domain health reports in one place. Fast, free, and built for real troubleshooting.
Start with a full domain health report, or use the featured tools below for specific checks.
Featured Tools
Start with the most-used lookups for domain research, troubleshooting, and security checks.
Full Health Report
Run DNS, SSL, email security, and blacklist checks in one report.
WHOIS Lookup
Check registrar, creation date, expiry date, name servers, and WHOIS details.
DNS Lookup
Query A, AAAA, MX, NS, TXT, CNAME, PTR, SOA, and more.
IP Lookup
Find IP geolocation, ASN, reverse DNS, ownership, and network details.
SSL Checker
Verify SSL certificate expiry, issuer, SANs, and remaining validity.
Blacklist Check
Check whether a domain or IP appears on common DNS-based blacklists.
Why Use DNSLookup.ca?
Fast, practical tools built for everyday troubleshooting, research, and domain operations.
Focused Toolset
DNS, WHOIS, IP, SSL, blacklist, and health-check tools designed to answer the most common technical questions quickly.
Built for Fast Checks
Useful for migrations, troubleshooting, domain research, email setup, website issues, and basic security reviews.
Clean, No-Login Access
Run common checks without creating an account or digging through multiple dashboards and provider tools.
DNS Education
How DNS Connects the Web
When you type a domain name, DNS translates it into the IP address a browser needs to connect. That translation happens in milliseconds, but several systems are involved behind the scenes.
The Phonebook Analogy
Think of DNS like a contact list. You remember a name, not a number. DNS does the same job for websites by translating domains into machine-readable IP addresses.
The Journey of a DNS Query
DNS Query Starts
8.8.8.8
Your device checks local cache first. If no answer exists, it asks a recursive resolver.
Root Server Response
.com
The resolver asks the DNS root where to find the correct top-level domain server.
TLD Server Lookup
example.com
The TLD server points the resolver toward the domain’s authoritative nameserver.
Authoritative Answer
93.184.216.34
The authoritative server returns the actual record data, such as the destination IP address.
Connection Loads
Your browser receives the IP, caches it temporarily, and continues loading the website.
Common DNS Records
| Type | Purpose |
|---|---|
| A | Maps a domain to an IPv4 address |
| AAAA | Maps a domain to an IPv6 address |
| CNAME | Alias that points one hostname to another |
| MX | Directs mail to a mail server |
| TXT | Stores text data such as SPF, DKIM, and verification |
| NS | Specifies the authoritative nameservers for a domain |
Securing DNS
DNS was not originally designed with privacy and authentication in mind. Modern standards improve that.
DNSSEC
Adds signatures to DNS responses so resolvers can verify authenticity and reduce spoofing risk.
DoH & DoT
DNS over HTTPS and DNS over TLS encrypt queries to help protect privacy between devices and resolvers.
Top Public DNS Servers
A few popular public resolvers commonly used for speed, privacy, and security.
Cloudflare DNS
Fast public resolver with a strong privacy reputation.
IPv4
IPv6
Google Public DNS
Widely used global DNS resolver with broad compatibility.
IPv4
IPv6
Quad9
Public DNS focused on blocking known malicious domains.
IPv4
IPv6
Start with the essentials
Run a full domain health report
Check DNS, SSL, blacklist status, email security, and registration data together so you can spot issues faster.