theck.es dominio lookup resultados del servidor whois.nic.es:

Conditions of use for the whois service via port 43 for .es domains
Access will only be enabled for  IP addresses  authorised  by Red.es.  A maximum of one  IP address per
user/organisation is permitted.
Red.es accepts  no responsibility  whatsoever  for  the availability  of access to WHOIS,  which may be
suspended at any time and without prior warning at the discretion of the public entity.
The service will be limited to the data established by Red.es.
The user  promises  to make use of the service and to  carry out any action derived  from the aforesaid
use in accordance with  current applicable  regulations, in particular with legislation on “.es� domain
names and personal data protection.
In particular, the user undertakes not to use  the service  to carry out abusive  or speculative domain
name registrations, pursuant to section 5 of the Sixth Additional Provision of Law 34/2002, of 11 July,
on Services of the  Information  Society and  Electronic Commerce. Likewise, the User undertakes not to
use the service to  obtain data, the possession  of which may  contravene the provisions of Organic Law
15/1999,  of  13 December,  on Personal Data Protection, and  its Regulations, or in Law 34/2002, of 11
July, on Services of the Information Society and Electronic Commerce.
Failure  to comply with these conditions will result in the immediate withdrawal of the service and any
registered domain name which breaches said conditions may be officially cancelled by Red.es.
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The IP address used to perform the query  is not authorised  or  has exceeded the established limit for
queries.To request access to the service,complete the form located at https://sede.red.gob.es/sede/whois,
where you may also consult the service conditions.
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More information on each domain may be consulted at www.dominios.es.