% 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 '178.244.0.0 - 178.247.255.255'

% Abuse contact for '178.244.0.0 - 178.247.255.255' is 'abuse@turkcell.com.tr'

inetnum:        178.244.0.0 - 178.247.255.255
netname:        TR-TURKCELL-INTERNET
descr:          TURKCELL INTERNET
country:        TR
admin-c:        TIM96-RIPE
tech-c:         TIM96-RIPE
status:         ASSIGNED PA
mnt-by:         TR-TURKCELL
created:        2012-04-30T05:55:35Z
last-modified:  2012-04-30T05:55:35Z
source:         RIPE

person:         Turkcell IP Manager
address:        Turkcell Kartal Plaza
address:        Topselvi Mahallesi Dipcik Sokak No:31
address:        Kartal ISTANBUL
phone:          +90 216 458 10 00
fax-no:         +90 216 427 50 60
nic-hdl:        TIM96-RIPE
mnt-by:         tr-turkcell
created:        2006-04-17T07:04:48Z
last-modified:  2011-07-17T21:19:30Z
source:         RIPE # Filtered

% Information related to '178.244.144.0/20AS16135'

route:          178.244.144.0/20
origin:         AS16135
mnt-by:         tr-turkcell
created:        2024-10-02T23:29:43Z
last-modified:  2024-10-02T23:29:43Z
source:         RIPE

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