Free DNS Lookup, WHOIS & Email Tools
Check DNS records, DMARC, SPF, DKIM, SSL certificates and domain info — free, instant, no login required.
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🌐 DNS & Network
Analyze DNS records, check propagation, scan ports, verify SSL certificates
DNS Checker
Lookup DNS records: A, AAAA, MX, TXT, NS, CNAME and more
DNS Propagation
Check DNS propagation across 10+ global resolvers
Blacklist Checker
Check if your IP/domain is listed on 50+ spam blacklists
SSL Checker
Verify SSL certificate validity, expiry, and chain
Reverse IP
Find all domains hosted on an IP address
Port Scanner
Scan common TCP ports to check what services are running
Email Header Analyzer
Analyze email headers and trace delivery path
📧 Email Authentication
Validate DMARC, SPF, DKIM policies and generate missing records
DMARC Checker
Check and validate DMARC records for your domain
SPF Checker
Validate SPF records and check email authentication
DKIM Checker
Verify DKIM signatures for your domain
BIMI Checker
Check BIMI record and brand logo for email
MTA-STS Checker
Verify MTA-STS policy for secure email transport
Email Auth Report
Full email authentication report for your domain
🏷️ Domain Tools
WHOIS lookup, domain availability, age checking, and subdomain discovery
WHOIS Lookup
Look up domain registration and ownership data
Domain Availability
Check domain availability across 15+ TLDs instantly
Domain Age Checker
Find out how old a domain is and when it expires
Subdomain Finder
Discover subdomains for any domain
Domain IP History
View historical IP addresses for a domain
Why use Hostao Tools?
Trusted by developers, sysadmins, and SEO professionals worldwide
Instant Results
Get real-time DNS, WHOIS, and email auth results in seconds — no waiting, no queue.
100% Free
All tools are completely free with no signup, no limits on basic usage, and no hidden fees.
Global DNS Servers
Check DNS propagation across 20+ worldwide servers spanning North America, Europe, and Asia.
20+ Tools
DNS lookup, WHOIS, DMARC, SPF, DKIM, SSL checker, port scanner, blacklist checker and more.
Free API for Developers
1,000 free API calls per day. No API key required for basic usage. Build your own tools on top of our infrastructure.
Frequently Asked Questions
What is a DNS lookup tool?
A DNS lookup tool queries the Domain Name System to retrieve DNS records like A, MX, TXT, NS and CNAME for any domain. It shows the current DNS configuration in real-time directly from authoritative nameservers.
How do I check if my domain is blacklisted?
Use our free Blacklist Checker to instantly check your domain or IP against 50+ spam blacklists including Spamhaus, SORBS, and Barracuda.
What is DMARC and how do I check it?
DMARC (Domain-based Message Authentication) is an email security policy. Use our DMARC Checker to verify your domain has a valid DMARC record and protect against email spoofing.
How do I check DNS propagation?
Our DNS Propagation Checker tests your domain across 20+ global DNS servers to show where your DNS changes have updated and where they are still propagating.