Create attribut

[Test <test@newpanel.com>]

I would like to create a new directory for school project with these 
informations :

Uniq Number (6 digits)             -->  ?
Name of School                     -->   dn
Address                            -->  postalAddress
Postal Code                        -->  PostalCode
Telephone Number                   -->  telephoneNumber
Fax Number                         -->  facsimileTelephoneNumber
Email                              -->  mail
Password                           -->  USerpassword
Group Number (3 digits) not uniq   -->  ?



Is-it Correct and what can i use for Uniq Number (6 digits) and Group 
Number (3 digits) ?

Thanks