The dev toolbox
for every occasion.

Display your public IP address with reverse DNS (PTR) lookup.

Query A, AAAA, MX, NS, TXT, CNAME records. Multiple resolvers.

Check DNS propagation across 15 global resolvers. Per-resolver status, TTL and query time.

Registrar, nameservers, creation and expiry dates for any domain.

Test an IP or domain against 30+ spam and abuse blacklists. Reason strings included.

SPF, DKIM, DMARC, PTR and blacklist report. A–F grade with per-record detail.

TCP connect scan with service identification. Common, web, DB and mail presets.

Test latency and reachability to any host from the server. Ping, traceroute and timing breakdown.

Certificate chain, expiry, cipher suite, protocol support and vulnerabilities.

Detect server, CDN, framework, CMS and analytics from headers and page source.

Inspect your browser, OS, hardware, display, network, and permissions.

MD5, SHA-1, SHA-256, SHA-512 from text or file. MD5→UUID pipeline.

RFC-4122 v4 and time-ordered v7 UUIDs plus ULID. Bulk generation, format options.

Random characters, Diceware passphrase and PIN modes. Entropy meter. All local.

Generate .htpasswd entries with bcrypt, MD5-APR or plaintext. All hashing in-browser.

Encode and decode Base64 and Base64url. Standard and URL-safe. File drag-and-drop.

Percent-encode and decode URLs. Query parameter breakdown.

Decode header, payload and signature. Validate claims, expiry and algorithm.

Pretty-print, minify, sort keys and validate JSON with syntax highlighting.

Live inline match highlighting. Capture groups, replace mode, flag reference.

Parse cron expressions into plain English. Next run times, monthly heatmap.

Build cron expressions visually. Grid per field, step/range/specific modes.

Subnet range, broadcast, host count, 32-bit diagram and subnet splits.

Live Unix clock. Convert timestamps, compute relative time, format in any TZ.

HEX, RGB, HSL, HSV. Custom picker, harmony wheels, tints, WCAG contrast.

Browse all Unicode emojis by category. Search by name or shortcode, copy with one click.

Render text as ASCII art using classic FIGlet fonts. Copy as plain text or styled block.

Format text with Unicode styles: bold, italic, script, fraktur, monospace, strikethrough and more.

Generate Lorem Ipsum and filler text. Control paragraph count, word count and format.

IANA-registered DNS resource record types — A, AAAA, CNAME, MX, DNSSEC and more, with RFCs.

IANA well-known ports 0–1023 — services, protocols, and the RFCs that define them.

All standard HTTP response codes 1xx–5xx with descriptions, per RFC 9110.

HTTP request methods with safe, idempotent, and cacheable properties — GET, POST, PUT, PATCH and more.

IANA HTTP field names across request, response, CORS, security, caching, and more.

IANA media types for text, image, audio, video, application, font, and multipart content.