From HEXONET Wiki
The ModifyContact command allows you to modify the WHOIS contact data of the domain:
(required) command = ModifyContact contact = (CONTACT) (optional) title = (TEXT) firstname = (TEXT) middlename = (TEXT) lastname = (TEXT) organization = (TEXT) street = (TEXT) city = (TEXT) state = (TEXT) zip = (TEXT) country = (COUNTRY) phone = (PHONE) fax = (PHONE) email = (EMAIL) vatid = (TEXT) x-at-disclose = 0 | 1 x-at-disclose-voice = 0 | 1 x-at-disclose-fax = 0 | 1 x-at-disclose-email = 0 | 1 x-pl-consentforpublishing = 0 | 1 delete0 = TITLE | FIRSTNAME | MIDDLENAME | LASTNAME | ORGANIZATION | STREET | ZIP | CITY | STATE | COUNTRY | PHONE | FAX | EMAIL | VATID | x-... delete1 = ... delete2 = ... . . .
IMPORTANT: Please have a look at the Domain API-Manual for a list of allowed parameters.
(required) code = (CODE) description = (DESCRIPTION)