% 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 '83.166.71.0 - 83.166.71.31'

% Abuse contact for '83.166.71.0 - 83.166.71.31' is 'ops-support@openmarket.com'

inetnum:        83.166.71.0 - 83.166.71.31
netname:        OPENMARKET
descr:          Chiswick Office
country:        GB
tech-c:         CW867-RIPE
admin-c:        CW867-RIPE
status:         ASSIGNED PA
mnt-by:         MXTELECOM-MNT
created:        2011-02-04T16:25:34Z
last-modified:  2011-02-04T16:25:34Z
source:         RIPE

person:         Chris Wilson
address:        OpenMarket Ltd 389 Chiswick High Road Chiswick London, W4 4AL UK
phone:          +44 845 666 7778
nic-hdl:        CW867-RIPE
created:        2004-04-15T14:23:29Z
last-modified:  2012-04-10T18:06:20Z
source:         RIPE # Filtered
mnt-by:         MXTELECOM-MNT

% Information related to '83.166.64.0/19AS31562'

route:          83.166.64.0/19
descr:          OpenMarket Limited
origin:         AS31562
mnt-by:         MXTELECOM-MNT
created:        2004-08-09T10:56:05Z
last-modified:  2011-02-07T11:37:00Z
source:         RIPE # Filtered

% Information related to '83.166.64.0/19AS43009'

route:          83.166.64.0/19
origin:         AS43009
mnt-by:         INFOBIP
mnt-by:         MXTELECOM-MNT
mnt-by:         uk-infobip-1-mnt
created:        2023-07-04T14:45:41Z
last-modified:  2023-07-04T14:45:41Z
source:         RIPE

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