Domain names can only contain alphabets, numbers and dashes (i.e. hyphens or the minus signs). The underscore character, "_", is an invalid character. SGNIC will reject applications for domain names containing invalid characters. Each field in the domain name should be less than sixty three characters long. Applications for long domain names such as very-long-domain-name-with-more-than-63-characters-in-total-for-3rd-level-only.COM.SG will be rejected.