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Diagnostics

Subdomain finder Find hostnames for your domain—public listings, export-ready. DNS Scanner Full DNS health report in one scan. Email Health MX, SPF, DMARC, DKIM sweep, SMTP :25 probe, DNS blocklists, MTA-STS. Speed Lab Speed test. Page Speed Global load test: TTFB, score, resources, and tips. Redirect check Full redirect chain, status codes, loops, SEO hints. Technical SEO Check Metadata, indexing, HTTPS, redirects, TTFB, and mobile signals — fast developer audit. Tech stack & CMS detector Web server, CDN, CMS, frameworks, and common JS libraries from headers plus HTML fingerprints. What is my IP? Lookup Public IP address lookup, IPv4 & IPv6, geolocation map. ASN / ISP lookup ISP, ASN, and organization for a public IP—useful for abuse reports and debugging. SSL check TLS grade, chain, cipher & weak warnings, expiry, trust. Port check Is a TCP port open? WHOIS Domain registration lookup. Ping TCP ping: latency to host.

DNS lookup

DNS Propagation Same record from your node + Speed Lab mirrors (multi-region). SPF Generator Build SPF TXT records for email.

Security & mail

DMARC Generator Build DMARC TXT records for email.

Developer

JWT Decoder Decode JWT header and payload. Hash Generator MD5, SHA-256 and more. UUID Generator Generate UUID v4. Cron Generator Build cron schedules and preview next run times. cURL Tester Paste a cURL command, send the request. API Endpoint Tester Send requests to any API URL. JSON Formatter Pretty-print JSON, minify, validate, and fix common paste errors. Base64 Encode/Decode Encode or decode Base64 text. URL Encode/Decode Encode or decode URL components. QR Code Generator Create QR codes in your browser. Colors and size. Gamepad tester HTML5 Gamepad API: sticks, axes, buttons, drift & rumble.

Your IP: 216.73.216.42

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Port check

See if a TCP port is open (from our server).

Host Port

DNS, mail, and connectivity diagnostics in your browser. No account required.

DNS lookup

DNS Propagation
SPF Generator
PTR / reverse DNS Soon

Diagnostics

Subdomain finder
DNS Scanner
Email Health
Speed Lab
Page Speed
Technical SEO Check
Redirect check
Tech stack & CMS detector
What is my IP? Lookup
ASN / ISP lookup
SSL check
Port check
WHOIS
Ping
Traceroute Soon

Developer

JWT Decoder
Hash Generator
UUID Generator
Cron Generator
cURL Tester
API Endpoint Tester
JSON Formatter
Base64 Encode/Decode
URL Encode/Decode
QR Code Generator
Gamepad tester

Security & mail

DMARC report Soon
TLS / cert check Soon
Blacklist check Soon

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