% 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://apps.db.ripe.net/docs/HTML-Terms-And-Conditions

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

% Information related to '212.252.168.0 - 212.252.175.255'

% Abuse contact for '212.252.168.0 - 212.252.175.255' is 'abuse@turkcell.com.tr'

inetnum:        212.252.168.0 - 212.252.175.255
netname:        TURKCELL-NET
descr:          TURKCELL A.S.
country:        TR
admin-c:        TIM96-RIPE
admin-c:        TIM96-RIPE
tech-c:         TIM96-RIPE
status:         ASSIGNED PA
mnt-lower:      MNT-TCELLPA
mnt-domains:    MNT-TCELLPA
mnt-routes:     MNT-TCELLPA
mnt-by:         MNT-TCELLPA
created:        2004-09-06T06:49:39Z
last-modified:  2023-07-27T09:39:01Z
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 '212.252.168.0/24AS16135'

route:          212.252.168.0/24
descr:          Turkcell PA-4-168
origin:         AS16135
mnt-by:         SOL-NET
created:        2005-08-21T11:44:14Z
last-modified:  2005-08-21T11:44:14Z
source:         RIPE

% This query was served by the RIPE Database Query Service version 1.111 (SHETLAND)

Search for
IP address lookups			Miscellaneous queries
-l	1st level less specific		-i	Inverse attributes	None admin-c admin-c,tech-c,zone-c author cross-mnt cross-nfy local-as mbrs-by-ref member-of mnt-by mnt-lower mnt-nfy mnt-routes notify nserver origin person referral-by rev-srv sub-dom tech-c upd-to zone-c
-L	All less specific		-T	Object types	All as-block as-set aut-num domain filter-set inet-rtr inet6num inetnum irt key-cert mntner peering-set person role route route-set rtr-set
-m	1st level more specific
-M	All more specific		Query hints Include "AS" in front of an AS number. Example: AS4808 Include "-t" (template only) or "-v" (template and description) in front of an object name to view the template Example: -t inetnum
-x	Exact match only
-d	Associated reverse domain