Your Connection Information
Free Online Developer Tools
IP / CIDR Calculator
Subnet calculator — network address, broadcast, and usable host count from any IPv4 CIDR block.
QR Code Generator
Generate QR codes from any URL or text. Choose error correction level L / M / Q / H.
Password Generator
Cryptographically random passwords with symbols, digits, and mixed case.
Hash Generator
MD5, SHA-1, SHA-256, SHA-384, SHA-512, bcrypt (cost 10), and htpasswd hashes.
Encoder / Decoder
Base64, URL percent-encoding, and HTML entity escape — encode and decode in one place.
JSON Formatter
Paste raw or minified JSON to instantly pretty-print and validate it.
Text Utilities
UPPERCASE / lowercase conversion and duplicate line removal.
Crypto Key Generator
RSA keypairs (2048 / 4096-bit), WireGuard private keys, IPsec PSK, and WEP keys.
UUID & MAC Generator
RFC 4122 UUID v4, random MAC addresses, random numbers, and dice rolls.
DNS Lookup
Query A, AAAA, MX, TXT, CNAME, NS, SOA, PTR, SRV, CAA via DNS over HTTPS (DoH).
Download Speed Test
Measure your download speed with a 20 MB Cloudflare test file. Real-time Mbps readout.
Server-Side API
DNS, WHOIS, ping, port check, geolocation, email headers, subdomain finder, BGP & more.
IP / CIDR Subnet Calculator
Enter an IPv4 address and prefix length to calculate network address, broadcast address, and usable host count.
QR Code Generator
Generate a QR code from any URL or text. Higher error correction levels stay scannable even when partially obscured.
Secure Password Generator
Random password using uppercase, lowercase, digits, and symbols. All generation happens in your browser.
Hash Generator — MD5, SHA, bcrypt, htpasswd
Enter a string and choose a hash algorithm. bcrypt uses cost factor 10. All hashing runs locally in your browser.
Base64 & URL Encoder / Decoder
Encode or decode Base64, percent-encode / decode URLs, or escape HTML entities.
JSON Formatter & Validator
Paste minified or raw JSON to pretty-print it with 2-space indentation. Invalid JSON shows an error.
Text Utilities
Convert text case or remove duplicate lines from a multi-line block.
Security & Crypto Key Generators
Generate RSA keypairs, WireGuard private keys, IPsec pre-shared keys, and WEP keys — all locally, never sent to a server.
UUID v4, MAC Address & Random Generators
Generate RFC 4122 UUID v4 identifiers, random MAC addresses, random integers, or simulate a dice roll.
DNS Lookup — DNS over HTTPS (DoH)
Query live DNS records directly from your browser. No server needed — queries go straight to the selected resolver.
TTL is in seconds. PTR lookups on a bare IP (e.g. 8.8.8.8) auto-convert to 8.8.8.8.in-addr.arpa.
Download Speed Test
Downloads a 20 MB file from Cloudflare's edge network and measures real-time throughput. Results reflect your connection to the nearest Cloudflare PoP.