From HEXONET Wiki
The CheckDomains command is used to check the availability of a set of domain names.
COMMAND
(required) command = CheckDomains domain0 = (DOMAIN) domain1 = (DOMAIN) domain2 = (DOMAIN) ... x-idn-language = <TEXT>
RESPONSE
(required) code = (CODE) description = (DESCRIPTION) (optional) property[domaincheck][0]= (TEXT) property[domainchecktime][0] = (INT) property[domaincheck][1]= (TEXT) property[domainchecktime][1] = (INT) property[domaincheck][2]= (TEXT) property[domainchecktime][2] = (INT) ...