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 headers, body, and auth.
DB Viewer
Open SQLite databases, browse schema, run read-only SQL with autocomplete, paginate large result sets, and export to CSV or JSON.
ASCII Table
Complete ASCII character table with hex, octal, HTML, and decimal codes. Interactive reference with search and filtering.
HTML Code
Encode and decode HTML special characters and entities. Full reference with named, decimal, and hex entity codes.
BIP39 Word List
Complete BIP39 mnemonic word list reference with search. All 2048 words in the standard English BIP39 word list, searchable by index or substring.
Subnet Calculator
IPv4/IPv6 CIDR calculator with subnet splitter and VLSM allocator. Compute network address, broadcast, host range, and subnet mask — 100% client-side.