Using a tool
Choose a tool, enter only the information needed for that task, and read its result and any source information shown with it. Some tools run in the browser; others call the shared API or an upstream service.Network results
Network information reflects what the service can observe at request time. VPNs, proxies, cached responses, unavailable upstream services, and rate limits can affect results.Individual guides
DNS + RDAP
Read public DNS answers and optional RDAP records with clear explanations of caching and registration limits.
Font UI
Compare typefaces, preview sample text, and copy styling with the Font UI typography workbench.
Keyboard tester
Test physical key positions, modifiers, and repeat events in a focused keyboard display with adjustable visual feedback.
Mailfy
Inspect an address format and domain mail routing without sending a message or claiming mailbox verification.
Port checker
Test one public host and TCP port, then understand open, refused, and timed-out connections.
Random quote
Fetch and copy a short quotation, with practical guidance on attribution, verification, and provider limits.
Spotify preview
Load an official Spotify link in its embedded player and understand playback availability and privacy.
What is my IP?
See the public address observed by the website, with approximate network and location information.