World’s simplest and fastest service to get your IP address. It returns whatever IP you access the page from first (whether it’s IPv4 or IPv6) and then attempts to find the IPv4 or IPv6 on your connection (if available).
Just plain HTML with a tiny bit of JavaScript. No trackers, no fingerprinting, no statistics, no images, no requests to third party sites. It just shows you your IP addresses. Fast and free.