Olá,
Sei que o Registro.BR possui um serviço de whois que pode ser feito via Telnet na porta 43, onde após conectado basta digitar o domínio que retorna um texto como o abaixo:
Espero que ajude…
telnet whois.registro.br 43
% Copyright © 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.
% 2008-10-27 14:35:14 (BRST -02:00)
domain: guj.com.br
owner: KontrolMak Ltda
ownerid: 060.707.346/0001-56
responsible: Paulo Eduardo
country: BR
owner-c: KOL3
admin-c: KOL3
tech-c: KOL3
billing-c: KOL3
nserver: ns1.everydns.net
nsstat: 20081026 AA
nslastaa: 20081026
nserver: ns3.everydns.net
nsstat: 20081026 AA
nslastaa: 20081026
nserver: ns4.everydns.net
nsstat: 20081026 AA
nslastaa: 20081026
created: 20020810 #933962
expires: 20110810
changed: 20080818
status: published
nic-hdl-br: KOL3
person: Paulo Eduardo Azevedo Silveira
e-mail: [email removido]
created: 19990427
changed: 20020808
% Security and mail abuse issues should also be addressed to
% cert.br, http://www.cert.br/, respectivelly to [email removido]
% and [email removido]
%
% whois.registro.br accepts only direct match queries. Types
% of queries are: domain (.br), ticket, provider, ID, CIDR