how to check if a URL is visible from the public Internet

GeoPeeker is a tool for web developers that makes it possible to remotely view a site from different geographic locations. It's great for spotting region-specific content and can be especially helpful when launching a site, as it can be used to ensure that the DNS is propagating properly. GeoPeeker is also pretty handy for troubleshooting CDN and caching issues. The images are rendered using WebKit with a screen width of 1280 pixels.