Vamos a instalar en un Linux el paquete whois que nos va a dar información detallada de cada dominio y vamos a intentar averiguar los datos con los que se han registrado diferentes dominios.

$ sudo apt-get install whois
$ whois egibide.org

whois egibide.org 
Access to .ORG WHOIS information is provided to assist persons in 
determining the contents of a domain name registration record in the 
Public Interest Registry registry database. The data in this record is provided by 
Public Interest Registry for informational purposes only, and Public Interest Registry does not 
guarantee its accuracy.  This service is intended only for query-based 
access. You agree that you will use this data only for lawful purposes 
and that, under no circumstances will you use this data to: (a) allow, 
enable, or otherwise support the transmission by e-mail, telephone, or 
facsimile of mass unsolicited, commercial advertising or solicitations 
to entities other than the data recipient's own existing customers; or 
(b) enable high volume, automated, electronic processes that send 
queries or data to the systems of Registry Operator, a Registrar, or 
Afilias except as reasonably necessary to register domain names or 
modify existing registrations. All rights reserved. Public Interest Registry reserves 
the right to modify these terms at any time. By submitting this query, 
you agree to abide by this policy. 

Domain ID:D165343777-LROR 
Domain Name:EGIBIDE.ORG 
Created On:20-Apr-2012 18:49:15 UTC 
Last Updated On:07-Sep-2012 00:24:48 UTC 
Expiration Date:20-Apr-2014 18:49:15 UTC 
Sponsoring Registrar:Nominalia Internet S.L. (R89-LROR) 
Status:OK 
Registrant ID:a58426ede8cc 
Registrant Name:Fundacion Benefico Docente Jesus Obrero 
Registrant Organization:Fundacion Benefico Docente Jesus Obrero 
Registrant Street1:Calle Francia 32 
Registrant Street2: 
Registrant Street3: 
Registrant City:Vitoria 
Registrant State/Province:VI 
Registrant Postal Code:01002 
Registrant Country:ES 
Registrant Phone:+34.945000333 
Registrant Phone Ext.: 
Registrant FAX: 
Registrant FAX Ext.: 
Registrant Email:info@area52.es 
Admin ID:a5bb3fb6773f 
Admin Name:Rojo Martinez Ernesto 
Admin Organization:Ernesto Rojo Martinez 
Admin Street1:Calle Francia 32 
Admin Street2: 
Admin Street3: 
Admin City:Vitoria 
Admin State/Province:VI 
Admin Postal Code:01002 
Admin Country:ES 
Admin Phone:+34.945000333 
Admin Phone Ext.: 
Admin FAX: 
Admin FAX Ext.: 
Admin Email:info@area52.es 
Tech ID:NIC_PIR_TECH 
Tech Name:Technical Department 
Tech Organization:Nominalia Internet, S.L 
Tech Street1:Josep Pla 2, Torres Diagonal Litoral, Edificio B3, planta 3-D 
Tech Street2: 
Tech Street3: 
Tech City:Barcelona 
Tech State/Province:Barcelona 
Tech Postal Code:08019 
Tech Country:ES 
Tech Phone:+34.935074360 
Tech Phone Ext.: 
Tech FAX:+34.933102360 
Tech FAX Ext.: 
Tech Email:tecnico@nominalia.com 
Name Server:DNS1.NOMINALIA.COM 
Name Server:DNS2.NOMINALIA.COM 
Name Server: 
Name Server: 
DNSSEC:Unsigned 

Si probamos con un dominio .es vemos que whois nos dice que no tiene datos y nos remite a la página nic.es.

Muchas empresas de registro de dominios ofrecen la posibilidad de ocultar estos datos previo pago.

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