In-depth guides for every tool on NexTechTools — how each one works, why it was built the way it was, and how to get the most out of it.
Instantly view your public IP address, along with basic location and network details.
Query DNS records for any domain — A, AAAA, MX, TXT, CNAME, and more.
Test connectivity and measure latency to any host or IP address in real time.
Calculate network ranges, VLSM splits, host counts, and broadcast addresses instantly.
Check domain resolution across multiple public DNS resolvers to verify propagation.
Check DNS resolution, reverse DNS, geolocation, and response time for any host.
Check whether two IP subnets or CIDR ranges overlap or conflict.
Plan multiple named VLAN subnets carved from a single parent network block.
Look up any HTTP status code, its meaning, category, and common cause.
Parse any User-Agent string into browser, engine, OS, and device details.
Create strong, cryptographically random passwords with full control over length and character sets.
Identify the manufacturer of a network device from its MAC address or OUI.
Decode any cron schedule into plain English and see its next run times.
Generate a self-signed X.509 v3 certificate with RSA or ECDSA keys, exportable as PKCS12 or PEM.
Generate a private key and PKCS10 Certificate Signing Request to submit to a CA.
Inspect a PEM certificate's subject, issuer, validity, and extensions.
Inspect a CSR's subject, public key, and requested extensions before submitting it to a CA.
Decode a JSON Web Token to inspect its header, payload, and expiration.
Encode or decode text using Base64 or URL-safe percent-encoding.
Test regular expressions live against sample text with match highlighting.
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes of any text, instantly.
Compare two blocks of text or config files and highlight the differences.
Pretty-print, minify, and validate JSON with error highlighting.