Free, real, functional online tools: port checker, DNS lookup, ASN lookup, speed test, JSON formatter, base64, HMAC, MAC generator and more.
Every tool below is real and fully functional — real network lookups, real cryptography, real measurements. No demo, no fake output.
Check if a TCP port is open on any host — real connection test from our server.
Fetch the real SOA (Start of Authority) DNS record for any domain.
Resolve the real IPv6 (AAAA) DNS records for any domain.
Find the real Autonomous System Number (ASN) and network owner for any IP address.
Find real domains hosted on the same IP address.
Measure real download speed and latency from your browser to our server.
Measure your real download speed from our server with a single click.
Validate, format (pretty-print) and minify JSON in your browser — 100% real parsing.
Encode and decode Base64 with full UTF-8 (emoji, Bangla, unicode) support.
Percent-encode and decode URLs, query strings and parameters in your browser.
Generate real HMAC (SHA-256/384/512) signatures using your browser's WebCrypto API.
Generate cryptographically random, valid unicast MAC addresses.
Generate complete, valid SEO meta tags and Open Graph markup for any page.
Compare two texts line-by-line with a real LCS diff algorithm — additions and removals highlighted.
See the real current time and UTC offset for any timezone — powered by your browser's Intl API.
Cryptographically secure random passwords, hex strings and numbers — via crypto.getRandomValues.