% 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 '5.159.248.0 - 5.159.255.255'

% Abuse contact for '5.159.248.0 - 5.159.255.255' is 'abuse@anadolugrubu.com.tr'

inetnum:        5.159.248.0 - 5.159.255.255
netname:        TR-ABH-20120730
country:        TR
org:            ORG-ABHA1-RIPE
admin-c:        BA7457-RIPE
tech-c:         BA7457-RIPE
status:         ALLOCATED PA
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         tr-bntpro-1-mnt
mnt-lower:      MNT-ABH-MNT
mnt-lower:      tr-bntpro-1-mnt
mnt-routes:     MNT-ABH-MNT
mnt-domains:    MNT-ABH-MNT
created:        2012-07-30T09:27:38Z
last-modified:  2020-02-10T13:29:14Z
source:         RIPE # Filtered

organisation:   ORG-ABHA1-RIPE
org-name:       Anadolu Bilisim Hizmetleri A.S.
country:        TR
org-type:       LIR
address:        FSM Mah. Balkan Cad. No58 Buyaka E Blok Tepeüstü Umraniye
address:        34771
address:        Istanbul
address:        TURKEY
phone:          +902165788500
abuse-c:        AR17319-RIPE
mnt-ref:        MNT-ABH-MNT
mnt-ref:        tr-bntpro-1-mnt
mnt-ref:        RIPE-NCC-HM-MNT
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         tr-bntpro-1-mnt
created:        2012-05-22T10:59:43Z
last-modified:  2020-12-16T13:42:43Z
source:         RIPE # Filtered

person:         Batu AKALIN
address:        Fatih Sultan Mehmet Mah. Balkan Cad. No:58, Buyaka E Blok 34771 Tepeüstü Umraniye Istanbul
phone:          +905303263318
nic-hdl:        BA7457-RIPE
mnt-by:         tr-bntpro-1-mnt
mnt-by:         MNT-ABH-MNT
created:        2020-01-27T12:23:30Z
last-modified:  2020-02-10T14:23:27Z
source:         RIPE

% Information related to '5.159.248.0/21AS41296'

route:          5.159.248.0/21
descr:          Anadolu Bilisim Hizmetleri A.S.
origin:         AS41296
mnt-by:         MNT-ABH-MNT
mnt-routes:     MNT-ABH-MNT
created:        2012-08-01T22:46:45Z
last-modified:  2012-08-01T23:05:56Z
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