Free & Open
Technical tools that
actually work
Fast, free web tools for IT admins, developers, MSPs, and security professionals. No sign-ups. No trackers. No nonsense.
Web Tools
Domain Intelligence Scanner
Complete domain security assessment — DNS, DNSSEC, email auth, SSL/TLS, and security headers with overall score and recommendations.
Email Security Analyzer
Complete email security audit — SPF, DKIM, DMARC, MTA-STS, TLS-RPT, MX records, and BIMI with score, grade, and prioritised recommendations.
Website Security Scanner
Complete web security audit — TLS/SSL, security headers, HSTS, CSP, CAA records, and redirect hygiene with overall score and prioritised recommendations.
DNS Lookup
Full domain intelligence — all DNS records, email auth analysis, and health score.
WHOIS Lookup
Check domain registration dates, expiry, registrar, and nameservers.
Password Generator
Cryptographically secure passwords and passphrases with strength checker.
IP Address Lookup
Instantly see your public IP address and location info.
Subnet Calculator
Calculate CIDR ranges, network addresses, and host counts.
MAC OUI Lookup
Identify the manufacturer of any network device by MAC address.
Email Record Validator
Check SPF, DKIM, and DMARC DNS records for any domain.
DNS Propagation Checker
Check global DNS propagation status across multiple resolvers.
MX Lookup
Look up mail server records for any domain and identify the email provider.
Email Header Analyzer
Analyze raw email headers for spoofing risk, auth results, and mail path.
DMARC Generator
Build a valid DMARC TXT record with live preview, policy recommendations, and DNS instructions.
IP Reputation Checker
Check if an IP address is blacklisted or flagged for abuse.
Reverse DNS Lookup
Find the hostname for any IP address and verify forward DNS. Includes email deliverability check.
SPF Flattening Checker
Analyze SPF lookup usage, visualize include chains, detect PermError risk, and generate a flattened record.
MTA-STS Checker
Validate MTA-STS DNS record and policy file — check mode, MX patterns, and max_age for SMTP transport security.
TLS-RPT Checker
Validate the SMTP TLS Reporting record — check rua endpoints and ensure TLS failure reports are configured for your domain.
BIMI Checker
Validate BIMI brand logo configuration — check the BIMI TXT record, SVG logo URL, VMC authority certificate, and DMARC prerequisite.
SSL/TLS Certificate Checker
Inspect HTTPS certificates, check expiry dates, validate certificate chains, and verify HSTS configuration.
Security Headers Checker
Analyze HTTP security headers, get a security score, and see recommendations for CSP, HSTS, and more.
HTTP Redirect Checker
Trace redirect chains across all four URL variants, verify HTTPS upgrades, detect loops, and check canonical URL consistency.
CAA Lookup
Check which Certificate Authorities are authorized to issue TLS certificates for any domain. Verify issue, issuewild, and iodef records.
CSP Analyzer
Analyze the Content Security Policy header for any website. Detect unsafe-inline, unsafe-eval, and missing critical directives. Get a security score.
DNSSEC Checker
Verify DNSSEC signing, check DS and DNSKEY records, and confirm the chain of trust for any domain.
CSS Flexbox & Grid Generator
Visually build and copy CSS layout code instantly.