% 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 '45.156.31.0 - 45.156.31.255'

% Abuse contact for '45.156.31.0 - 45.156.31.255' is 'onurzorlu@atlantisnet.com.tr'

inetnum:        45.156.31.0 - 45.156.31.255
mnt-lower:      lir-tr-viva-1-MNT
org:            ORG-ATBH1-RIPE
mnt-domains:    tr-atlantis-1-mnt
mnt-lower:      tr-atlantis-1-mnt
mnt-routes:     tr-atlantis-1-mnt
abuse-c:        AR45341-RIPE
netname:        ATLANTIS-NET
country:        TR
admin-c:        OZ620-RIPE
tech-c:         OZ620-RIPE
tech-c:         SD12478-RIPE
status:         SUB-ALLOCATED PA
mnt-by:         tr-atlantis-1-mnt
mnt-by:         mnt-internetten-1
mnt-by:         lir-tr-viva-1-MNT
created:        2019-12-16T18:00:37Z
last-modified:  2023-08-06T16:59:35Z
source:         RIPE

organisation:   ORG-ATBH1-RIPE
org-name:       Atlantis Telekomunikasyon Bilisim Hizmetleri San. Tic. Ltd
country:        TR
org-type:       LIR
address:        Sultaniye mah. Dogan arasli bulv.no:140/8 Esenyurt
address:        34100
address:        istanbul
address:        TURKEY
phone:          +902129673434
admin-c:        OZ620-RIPE
tech-c:         OZ620-RIPE
abuse-c:        AR45341-RIPE
mnt-ref:        tr-atlantis-1-mnt
mnt-ref:        lir-tr-viva-1-MNT
mnt-ref:        lir-tr-ozdemir1-1-MNT
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         tr-atlantis-1-mnt
created:        2018-02-28T12:52:09Z
last-modified:  2023-08-22T21:22:30Z
source:         RIPE # Filtered

person:         Onur Zorlu
address:        Elmas Sok No:11 Avcilar
address:        34100
address:        istanbul
address:        TURKEY
phone:          +902126904677
nic-hdl:        OZ620-RIPE
mnt-by:         tr-atlantis-1-mnt
created:        2018-02-28T12:52:09Z
last-modified:  2018-02-28T12:52:09Z
source:         RIPE

person:         Yavuz Selim MALKOC
address:        Sultan Orhan Mah. Ilyasbey Cad, 1812 Sk.
address:        41400
address:        Kocaeli
address:        TURKEY
phone:          +902626446663
nic-hdl:        SD12478-RIPE
mnt-by:         mnt-tr-internetten-1
created:        2019-09-27T12:14:59Z
last-modified:  2019-09-30T13:41:16Z
source:         RIPE

% Information related to '45.156.31.0/24AS204457'

route:          45.156.31.0/24
origin:         AS204457
mnt-by:         mnt-internetten-1
mnt-by:         tr-atlantis-1-mnt
mnt-by:         lir-tr-viva-1-MNT
created:        2019-12-16T18:01:55Z
last-modified:  2021-09-25T20:54:18Z
source:         RIPE

% This query was served by the RIPE Database Query Service version 1.112 (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