Abuse contact for 191.7.42.157 is mail-abuse[at]cert.br

[C2H5OH]

That's definitely what whois.lacnic.net and whois.registro.br are saying...

% Joint Whois - whois.lacnic.net
% This server accepts single ASN, IPv4 or IPv6 queries

% Brazilian resource: whois.registro.br


% 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.
% 2015-05-27 12:43:57 (BRT -03:00)

inetnum: 191.7.40/21
aut-num: AS263310
abuse-c: SAAAR2
owner: Artennet Comunicações Ltda - Me
ownerid: 059.112.490/0001-60
responsible: Artennet Comunicações Ltda - Me
country: BR
owner-c: SAAAR2
tech-c: SAAAR2
inetrev: 191.7.40/21
nserver: ns1.artennet.com.br
nsstat: 20150526 AA
nslastaa: 20150526
nserver: ns.rjnetwork.com.br
nsstat: 20150526 AA
nslastaa: 20150526
created: 20140220
changed: 20140220

nic-hdl-br: SAAAR2
person: Samuel Adriano Arten
e-mail: suporte[at]artennet.com.br
created: 20061215
changed: 20140827

% Security and mail abuse issues should also be addressed to
% cert.br, http://www.cert.br/, respectivelly to cert[at]cert.br
% and mail-abuse[at]cert.br
%
% whois.registro.br accepts only direct match queries. Types
% of queries are: domain (.br), registrant (tax ID), ticket,
% provider, contact handle (ID), CIDR block, IP and ASN.