Free tools · No registration
Diagnostics
for domains & servers
DNS · SSL · Headers · Blacklist · WHOIS · Ports · Speed · GeoIP
DNS Lookup
A, MX, TXT, SPF, DKIM, DMARC records + global propagation
SSL Checker
Certificate, chain, expiry, cipher suite
Security Headers
HSTS, CSP, X-Frame-Options — grade A+ to F
Blacklist Check
Check IP against 31 RBL/DNSBL lists
WHOIS Lookup
Registration, expiry, nameservers, EPP status
Port Scanner
SSH, HTTP, HTTPS, SMTP, MySQL, PostgreSQL…
Speed Test
DNS time, TTFB, total load time
DNS Propagation
Record propagation across global resolvers on a world map
Redirect Checker
Full redirect chain hop-by-hop: 301, 302, HTTP→HTTPS
Tech Detector
Detect stack: Next.js, Cloudflare, WordPress, GA, CDN…
SPF/DMARC Generator
Generate mail authentication records step by step
GeoIP Lookup
Country, city, ISP, organization, ASN for any IP address
My IP Address
What's my IP? ISP, location, reverse DNS
AI ReadinessNEW
Readiness for ChatGPT, Claude, Perplexity — robots.txt, llms.txt, schema.org
What is WebCheck?
WebCheck.com.pl is a free suite of online diagnostic tools for domains and servers. Check DNS configuration, SSL certificates, HTTP security headers, RBL blacklists, WHOIS data, open ports and page load speed — no registration required.
Who is it for?
Server admins, webmasters, SEO specialists, developers, and site owners.
How to use?
Enter a domain or IP address in a tool and click "Check". Results appear in seconds. Use the full audit to run all tests at once.