Network & Web
Free, private, runs in your browser
IPv4 subnet calculator, MAC address tools, IPv6 ULA generator, URL encoder/parser, HTTP status codes, QR code generator, and device info.
IPv4 Subnet Calculator
Calculate IPv4 subnets, network ranges, and available hosts.
IPv4 Converter Suite
Convert IPv4 addresses between decimal, binary, hex and octal, and expand CIDR ranges into host lists. Tabbed, client-side.
MAC Address Toolkit
Look up MAC address vendors and generate random MACs with any OUI. Two tools in one tabbed page, fully client-side.
IPv6 ULA Generator
Generate IPv6 Unique Local Addresses.
URL Encoder/Decoder
Encode and decode URL strings.
URL Parser
Parse and analyze URLs to extract components.
HTML Entities
Encode and decode HTML entities.
Device Information
View your browser and device information.
User Agent Parser
Parse and analyze user agent strings.
HTTP Status Codes
Reference for HTTP status codes and their meanings.
Slugify
Convert text to URL-friendly slugs.
QR Code Generator
Generate QR codes from text or URLs.