Each domain registry works with different contacts, different rules for identifiers of contacts, with required items in the detail and other. Here is a detailed description of contacts for CZ domain.

• For CZ domain names is possible to specify contact’s name before its creation. There is an available command contact-check for this register,  by which you can verify that the name(ID) is applicable (not used, blocked ..)
• The contact name must contain only uppercase letters of the English alphabet, digits and dash.
• If the contact name will not be specified during contact creation it will be generated automatically.

• cname – contact name (only when creating a contact), skip, or leave blank for generating automatically
• company – your company
• fname – your name – required
• lname – your last name – required
• email – e-mail – required
• phone – your phone +XXX XXXXXXXXX
• fax – your fax +XXX XXXXXXXXX
• dic – VAT number
• addr_street – address – street – required
• addr_city – address – city – required
• addr_zip – ZIP – required
• addr_country – country (ISO code, lowercase, CZ.NIC accepts all countries) – required
• addr_state – state
• ident_type – document type
  • company ID (CID), identity card (IC), birthday date(DD.MM.YYYY), passport (pas), social affairs number (SAN)
• ident – document number (depends on ident_type)
• notify_email – notification e-mail
• disclose_phone – hide phone
• disclose_fax – hide fax
• disclose_email – hide e-mail
• disclose_ident – hide document
• disclose_notify_email – hide notification e-mail

In the contact for the .CZ domain is possible to hide some items in the contact details. It is an items phone, fax, e-mail, document, e-mail. If these informations are marked as hidden, you can not view them without authorization.

To the hiding there is an option disclose_* in contact detail, where is possible to insert flag to the corresponding node 0/1 (1 = hidden, 0 = public). 

The request to create a contact in the registry CZ.NIC will look like this:

minimum:

<request>
 <user>tester</user>
 <auth>8b91c1b94fd9a4488dc3d9160eebbf25c0b2a03f</auth>
 <command>contact-create</command>
 <data>
  <tld>cz</tld>
  <contact>
   <fname>Jan</fname>
   <lname>Novák</lname>
   <email>jan.novak@example.com</email>
   <addr_street>Zelená 1568</addr_street>
   <addr_city>Minas Morgull</addr_city>
   <addr_zip>12345</addr_zip>
   <addr_country>vg</addr_country>
   <phone>+011 123456789</phone>
  </contact>
 </data>
</request>

maximum:

<request>
 <user>tester</user>
 <auth>8b91c1b94fd9a4488dc3d9160eebbf25c0b2a03f</auth>
 <command>contact-create</command>
 <data>
  <tld>cz</tld>
  <contact>
   <cname>JAN-NOVAK</cname>
   <company>Great Silver Eye</company>
   <fname>Jan</fname>
   <lname>Novák</lname>
   <email>novak@example.com</email>
   <phone>+011 123456789</phone>
   <fax>+011 987654321</fax>
   <addr_street>Zelená 1568</addr_street>
   <addr_city>Minas Morgull</addr_city>
   <addr_zip>12345</addr_zip>
   <addr_country>vg</addr_country>
   <addr_state>Jihočeský</addr_state>
   <ident_type>op</ident_type>
   <ident>123567891</ident>
   <notify_email>honzanovak@example.cz</notify_email>
   <dic>CZ987654321</dic>
   <disclose_phone>1</phone>
   <disclose_fax>1</fax>
   <disclose_email>1</email>
   <disclose_vat>1</vat>
   <disclose_ident>1</ident>
   <disclose_notify_email>1</notify_email>
  </contact>
 </data>
</request>