Reference & Lookup
7 reference and lookup tools for quick developer lookups. Browse HTTP status codes with RFC references, look up ASCII character codes, encode HTML entities, explore SQLite databases with a SQL editor, test REST APIs with the HTTP client, search the BIP39 mnemonic word list, and calculate subnets with the IP Subnet Calculator. All tools are free and run entirely in your browser.
HTTP Status
Complete HTTP status code reference with descriptions, RFC references, and usage guides. Covers all IANA-registered codes plus common unofficial codes.
HTTP Client
Send HTTP requests and test REST APIs directly in your browser. Supports GET, POST, PUT, DELETE with custom headers, request body, and authentication.
DB Viewer
Open SQLite databases: browse schema, run read-only SQL with autocomplete, paginate large result sets, and export to CSV or JSON. Files never leave your device.
ASCII Table
Complete ASCII character table with decimal, hex, octal, and HTML codes for all 128 characters. Interactive reference with instant search and filtering.
HTML Code
Encode and decode HTML special characters and entities in your browser. Full reference table with named, decimal, and hex entity codes — searchable and free to use.
BIP39 Word List
BIP39 mnemonic word list reference with all 2048 words in the standard English list, searchable by index or substring. Free lookup tool, 100% in your browser.
Subnet Calculator
IPv4/IPv6 CIDR calculator with subnet splitter and VLSM allocator. Compute network address, broadcast, host range, and subnet mask — 100% client-side.