Network & hardware

Ask six public DNS resolvers for a domain's records at once and see whether a DNS change has reached them all.

Check whether an IPv4 address is a Tor exit node right now, using the Tor Project's live exit list.

Find out whether an IP address belongs to AWS, Google Cloud, Azure, Oracle Cloud, DigitalOcean, Cloudflare or Fastly, with its range, region and service.

Check a Counter-Strike 2 server's status: name, map, players, bots, game version and the list of connected players.

Check a Minecraft Bedrock Edition server's status: MOTD, version, online and max players, world name and game mode.

Find the hostname of any IPv4 or IPv6 address from its PTR record, and check that the hostname points back to the IP, as mail servers require.

Check whether a website or file is served with gzip, Brotli or Zstandard compression, and how many bytes each one saves.

Find when the Wayback Machine first and last archived any web page, with links to open both snapshots.

Check whether a web page on another origin can call a URL from the browser. Sends the CORS preflight and a request, then explains each check.

Check a website ads.txt or an app developer app-ads.txt file: which ad systems it authorizes, and which lines break the IAB format.

Check whether your browser supports the Geolocation API and allows location, then see your position and its accuracy on a map, once or live as you move.

Make 12 mm text labels and print them over Bluetooth on a Brother P-touch printer such as the PT-P300BT, right from Chrome or Edge, or download them as PNG.