There are only few or no providers listed in AICCU
There are unfortunately a number of DNS servers that are either misconfigured or have broken handling of long DNS records. This is usually caused by one or more of:
When this happens AICCU will not list any or only a limited amount of providers. To still be able to use AICCU for SixXS choose the manual option and use host "tic.sixxs.net" and "TIC" as the protocol.