Free Online DNS & Network Tools
Everything you need to inspect, debug, and secure your domains and servers. Real-time data, beautiful reports, and zero account required.
DNS Tools
Complete DNS Health Report
Run a full domain health check — DNS, SSL, email security, and blacklists — all in one click.
- All-in-one domain analysis
- SSL, Email, & Blacklist checks
- Traffic light scoring
DNS Lookup
Query DNS records for any domain using global resolvers.
- Global DNS records
- Multiple record types
DNS Propagation
Check how far your DNS changes have spread around the world.
- 37 global servers
- Visual map
- Real-time status
NS Lookup
Find the authoritative nameservers responsible for a domain.
- Nameserver list
- Routing details
CNAME Lookup
Trace canonical name aliases to their final destination.
- Trace CNAME chains
- Final destinations
AAAA Lookup
Retrieve IPv6 address records for any domain.
- IPv6 address records
- Network routing
Email & Security Tools
Email Security Grader
Analyze your SPF and DMARC records and get an instant security grade.
- SPF validation
- DMARC analysis
- Pass/Fail scorecard
MX Lookup
Identify which mail servers are configured to receive email for a domain.
- Mail server list
- Priority routing
TXT Lookup
Retrieve all TXT records, including SPF, DKIM, and DMARC entries.
- SPF/DKIM/DMARC records
- Verification tags
Blacklist Checker
Check if an IP address or domain is listed on major DNS blackhole lists (DNSBLs).
- Spamhaus & Barracuda checks
- IP and Domain scanning
- Email deliverability testing
Website & IP Tools
Website Status Checker
Instantly check whether a website is online or offline and measure its response time.
- Real-time uptime check
- HTTP status codes
- Response time metrics
WHOIS Lookup
Look up domain registration details, ownership, and expiry information.
- Domain registration
- Expiry dates
- Registrar info
IP Lookup
Get geolocation, ASN, and network details for any IP address.
- Geolocation
- ASN details
- Network mapping
Reverse IP Lookup
Resolve an IP address back to its associated hostname via PTR records.
- PTR records
- Hostname resolution
Open Port Checker
Test common network ports on any domain or IP to see what is open or blocked by a firewall.
- Scan common networking ports
- Check firewall status
- Test SSH, FTP, & Database connections
Full SSL Checker
Analyze SSL certificate chains, expiration dates, and SANs.
- Certificate chain analysis
- Expiration & SAN details
- Signature algorithm info
Subdomain Scanner
Uncover active subdomains for any domain in seconds using parallel DNS resolution.
- Parallel DNS resolution
- Wildcard detection
- Common subdomain wordlist
What Are Network and DNS Tools?
The internet runs on a complex system of IP addresses, domain name registries, and hidden security records. When an email bounces, a website goes offline, or a server migration stalls, it is almost always related to one of these underlying systems.
Our suite of tools acts as a diagnostic dashboard for the internet. By querying global servers in real-time, we allow you to bypass your browser's cache and see exactly what the rest of the world sees when they interact with your digital infrastructure.
Who Uses DNSLookup.ca?
Built for professionals, simple enough for beginners.
Web Developers
Checking DNS propagation during server migrations and verifying SSL certificate installations before launching client websites.
Security Analysts
Scanning open ports to reduce attack surfaces, finding hidden subdomains, and investigating malicious IP addresses.
IT & Email Admins
Diagnosing bouncing emails by checking MX priority, analyzing SPF/DMARC configurations, and verifying blacklist status.
Frequently Asked Questions
Are these DNS tools really free?
Yes. All of the network, IP, and DNS tools on DNSLookup.ca are completely free to use. We do not require an account, a credit card, or a subscription to access our data or run our health reports.
Where does the DNS data come from?
Our tools perform real-time queries directly to authoritative nameservers, global recursive resolvers, and official RDAP/WHOIS registries to ensure you are seeing the most accurate, live data available—bypassing your local computer's cache.
Do I need to download any software?
No. Everything runs securely in the cloud through your web browser. You can perform deep network analysis, port scanning, subdomain enumeration, and DNS lookups from any device without installing a single thing.
How often can I use the tools?
You can use the tools as often as you need for standard troubleshooting and diagnostic purposes. We only ask that you do not use automated bots to scrape or abuse the systems so they remain fast and available for everyone.