% APNIC found the following authoritative answer from: whois.ripe.net

% This is the RIPE Database query service.
% The objects are in RPSL format.
%
% The RIPE Database is subject to Terms and Conditions.
% See https://docs.db.ripe.net/terms-conditions.html

% Note: this output has been filtered.
%       To receive output for a database update, use the "-B" flag.

% Information related to '81.84.16.0 - 81.84.19.255'

% Abuse contact for '81.84.16.0 - 81.84.19.255' is 'abuse@nos.pt'

inetnum:        81.84.16.0 - 81.84.19.255
netname:        NOS
descr:          NOS COMUNICACOES S.A.
descr:          NOS CORPORATE CUSTOMER
country:        PT
admin-c:        NOSA2-RIPE
tech-c:         NOST1-RIPE
status:         ASSIGNED PA
remarks:        ABUSE REPORTS MUST BE SEND TO ABUSE@NOS.PT
remarks:        WITH THE LOG FILE FROM THE FIREWALL
remarks:        *** THIS INFORMATION IS NOT THE FIREWALL LOG ***
mnt-by:         AS2860-MNT
created:        2004-01-14T17:17:30Z
last-modified:  2019-02-22T12:14:08Z
source:         RIPE # Filtered

% Information related to '81.84.0.0/18AS2860'

route:          81.84.0.0/18
descr:          NOS COMUNICACOES S.A.
origin:         AS2860
mnt-by:         AS2860-MNT
created:        2014-10-28T10:35:05Z
last-modified:  2014-10-28T10:35:05Z
source:         RIPE

% This query was served by the RIPE Database Query Service version 1.124.1 (DEXTER)