IPvFoo

IPvFoo is a Chrome extension developed by Paul Marks. According to the data from Chrome web store, current version of IPvFoo is 2.6, updated on 2023-04-08.
90,000+ users have installed this extension. 172 users have rated this extension with an average rating of .
developer website: pmarks.net

Display the server IP address, with a realtime summary of IPv4, IPv6, and HTTPS information across all page elements.

IPvFoo uses the webRequest API to extract protocol-related information as a web page downloads, and summarizes it into a convenient table. Everything is captured and displayed privately, without creating any additional network traffic.

A large 4 or 6 on the extension icon shows whether the outer page was fetched using IPv4 or IPv6. If the page contains elements from other domains, a smaller 4 or 6 appears alongside.

When you click the icon, a table appears with a row for each domain:

- A padlock icon for http://, https://, or a mix of both.

- The IPv4 or IPv6 address. If connections span more than one address, the most recent one wins. The address is highlighted in yellow while connections are open.

- A "cached" symbol, meaning that no actual connections took place, so the IP address might be stale.

- An "S" for WebSocket handshakes in Chrome 58+.

Clicking on a hostname or address will select it for convenient copying. There's also a right-click option to look up addresses with bgp.he.net. I'm not affiliated with that service, but it's my personal favorite.

IPvFoo is Free Software (Apache 2.0 license).