(XID qjwvug) Sorry, only domain names which are pointed to dns1.namecheaphosting.com and dns2.namecheaphosting.com can be added as addon domains. You can learn more at https://www.namecheap.com/support/knowledgebase/article.aspx/897/29/how-to-add-new-domain-to-hosting-account or contact our support.
