% 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 '83.70.152.176 - 83.70.152.183'

% Abuse contact for '83.70.152.176 - 83.70.152.183' is 'ripe-support@eir.ie'

inetnum:        83.70.152.176 - 83.70.152.183
netname:        RSMUK
descr:          Eircom Customer Assignment
country:        IE
admin-c:        NM9260-RIPE
tech-c:         NM9260-RIPE
status:         ASSIGNED PA
mnt-by:         TE-MNT
remarks:        Please send spam and other abuse complaints to abuse@eircom.net
created:        2024-12-19T15:19:48Z
last-modified:  2024-12-19T15:19:48Z
source:         RIPE # Filtered

person:         Niall May
address:        5th Floor, Block D Iveagh Court
address:        Harcourt Street, D2
address:        D02 VH94
phone:          +353 086 4100219
mnt-by:         TE-MNT
nic-hdl:        NM9260-RIPE
created:        2024-12-19T15:19:48Z
last-modified:  2024-12-19T15:19:48Z
source:         RIPE # Filtered

% Information related to '83.70.0.0/15AS5466'

route:          83.70.0.0/15
descr:          eircom, Ireland
origin:         AS5466
remarks:        For abuse/spam complaints for addresses from this block
remarks:        please contact the techc and/or adminc for the individual
remarks:        inetnum objects. If this does not resolve the problem to
remarks:        your satisfaction please contact abuse@eircom.net.
remarks:        networks@eircom.net should ONLY be used for routing issues.
mnt-by:         TE-MNT
created:        2004-01-06T13:13:20Z
last-modified:  2004-01-06T13:13:20Z
source:         RIPE # Filtered

% This query was served by the RIPE Database Query Service version 1.120 (ABERDEEN)