If you need to open URLs on your firewall to allow Insteo content to run, all non-Social media apps use only insteo.com and cloudinary.com URLs. opening "*.insteo.com" and "*.cloudinary.com" is sufficient, as all content, images and API calls come from Insteo servers or our CDN cloudinary.com.
If you use Social Media apps, URL blocking / unblocking may not be appropriate. Facebook, Instagram, Pinterest, Twitter and other Social Networks use a combination of Content Delivery Networks (CDNs) and also provide direct link to images, links and other content. Generally Insteo only uses images from third party links, such as PNG, GIF and JPG content.
If your firewall allows direct pass through of image content, this may be an acceptable model.