Re: This site can’t be reached www.sitename server IP address could not be found.
Hi @HeatherC14. Thanks for being part of GoDaddy Community! The term subdomain is usually used in one of two ways. Sometimes people use it to describe a domain that is hosted under another domain on a hosting plan. However, it's more commonly used to describe a DNS host at the beginning of a domain, for example, subdomain.domain.com.
If you are talking about the second type of subdomain, you will need to add that as a separate DNS record for "www.subdomain" in order for it to resolve online. You can either add it as a CNAME record (most common) that points to "@", or you can add it as an A Record that points to an IP address. Note that in order for the CNAME method to work, you would need to be pointing it toward the same IP as the domain name.