Your registration may have expired. When you register a domain name, you can register it for one to 10 years. When your registration expires, the registry will auto-renew the domain name for one year and debit your registrar’s account for the renewal fee. If your registrar does not receive your registration payment, your registrar can take one of several actions, including deleting or placing your domain name on “hold”. These actions will remove your domain name from the zone file, and all Internet services, including email, for that domain name will cease.
If the registrar deletes your domain name, you have 30 days from the date of deletion to contact your registrar to restore and renew it. See FAQs about the Redemption Grace Period for more information.