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Essential network diagnostic tools for webmasters and developers. DNS lookup, SSL certificate checker, website health check, and more. Diagnose domain and server issues quickly.
Query all DNS record types including A, AAAA, MX, NS, TXT, CNAME, SOA, SRV, PTR, and CAA records.
Check HTTP status, response time, SSL certificate, security headers, and redirect chains.
Find all NS records for any domain with their resolved IPv4 and IPv6 addresses.
Verify SSL/TLS certificates, check expiry dates, certificate chain, and security vulnerabilities.
Upload or paste PEM, DER, PKCS7, or PKCS12 certificates to analyze details. All processing in browser.
Convert between different IP address formats (Binary, Decimal, Hex, Octal, IPv4, IPv6).
Calculate network addresses, IP ranges, and host counts from CIDR notation.
Parse email headers to trace routing, verify SPF/DKIM/DMARC authentication, and detect issues.
Query domain registration details, ownership info, nameservers, and expiration dates.
Resolve an IP address to its associated hostname(s) (PTR records) for verification.
Get instant DNS and SSL information for any domain.
Full certificate chain, security headers, and vulnerabilities.
Certificate analyzer runs entirely in your browser.
Copy results in JSON format for easy integration.
Our DNS lookup tool supports all common record types: A (IPv4), AAAA (IPv6), MX (mail), NS (nameservers), TXT, CNAME, SOA, SRV, PTR (reverse DNS), and CAA (certificate authority).
We establish a TLS connection to the target domain from our server, retrieve the certificate chain, and analyze it for validity, expiration, protocol version, and potential security issues.
Yes. The Certificate Analyzer processes certificates entirely in your browser using JavaScript. Your certificate data never leaves your device or gets sent to any server.
We check for HSTS, Content-Security-Policy, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, and Permissions-Policy headers, providing a security score based on their presence.
Enter an IP address with CIDR notation (e.g., 192.168.1.0/24) to instantly calculate network address, broadcast address, subnet mask, usable host range, and total host count. It runs entirely in your browser.
The analyzer parses email headers to show the routing path (hops), verifies SPF, DKIM, and DMARC authentication results, identifies delivery delays, and detects potential security issues. All processing happens in your browser.
Our tool queries official WHOIS databases to retrieve real-time domain registration information, including ownership details, registration dates, expiration status, and authoritative nameservers.
Reverse DNS (rDNS) is the opposite of a standard DNS lookup. It resolves an IP address back to a domain name (via PTR records), which is useful for verifying email servers and network troubleshooting.