Existem várias formas de se obter os dados de um domínio da internet.
Uma destas formas, utilizando o terminal do Linux, é através do comando whois, conforme exemplo abaixo:
$ whois planalto.gov.br % Copyright (c) Nic.br % The use of the data below is only permitted as described in % full by the terms of use (http://registro.br/termo/en.html), % being prohibited its distribution, comercialization or % reproduction, in particular, to use it for advertising or % any similar purpose. % 2013-03-27 14:18:44 (BRT -03:00) domain: planalto.gov.br owner: PRESIDENCIA DA REPUBLICA ownerid: 000.394.411/0001-09 responsible: Secretaria de Administração country: BR owner-c: MAR79 admin-c: MAR79 tech-c: MAR79 billing-c: MAR79 nserver: alpha.planalto.gov.br 200.181.15.5 nsstat: 20130326 AA nslastaa: 20130326 nserver: alpha2.planalto.gov.br 200.181.15.14 nsstat: 20130326 AA nslastaa: 20130326 created: 19960416 #6787 changed: 20110703 status: published nic-hdl-br: MAR79 person: Coord. Tecnologia de Rede e-mail: postmaster@planalto.gov.br created: 19980526 changed: 20060210 % Security and mail abuse issues should also be addressed to % cert.br, http://www.cert.br/, respectivelly to cert@cert.br % and mail-abuse@cert.br % % whois.registro.br accepts only direct match queries. Types % of queries are: domain (.br), ticket, provider, ID, CIDR % block, IP and ASN.