Can I use a custom domain or subdomain?
Currently, we're not supporting custom domains or subdomains.
All podcast fan pages are hosted on subdirectories, like: podinbox.com/yourpodcast
These vanity URLs are totally customizable, so it's a good idea to reserve your custom URL before someone else takes it. There is no limit to how often you can change your custom vanity URL.
Please keep in mind that when you change your custom URL, another user can potentially take that URL.