The main domain extensions (TLDs) include default minimum and maximum length limits. You can customize your own minimum and maximum lengths for other TLDs.

Defaults #

The default minimum length is three characters and the default maximum length is 63 characters for the following TLDs:

Customize Domain Length Restrictions #

To do this:

1. Edit the configuration.php file for your WHMCS installation.
2. Add $DomainMinLengthRestrictions values for each minimum length and $domainMaxLengthRestrictions values for each maximum length.
3. Save the file.

For example, adding the following lines to a configuration.php file would require that all .asia domain names contain between three and 64 characters and all .ws domain names contain between four and 63 characters:

$DomainMinLengthRestrictions[".asia"] = 3;
$DomainMaxLengthRestrictions[".asia"] = 64;
$DomainMinLengthRestrictions[".ws"] = 4;
$DomainMaxLengthRestrictions[".ws"] = 63;

Last modified: 2025 July 28