% 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 '5.176.240.0 - 5.176.247.255'

% Abuse contact for '5.176.240.0 - 5.176.247.255' is 'abuse@turktelekom.com.tr'

inetnum:        5.176.240.0 - 5.176.247.255
netname:        AVEA
descr:          AVEA Iletisim Hizmetleri A.S.
country:        TR
org:            ORG-ITHA1-RIPE
admin-c:        Aa3018-RIPE
tech-c:         Aa3018-RIPE
status:         ASSIGNED PA
mnt-by:         AVEA-MNT
mnt-lower:      AVEA-MNT
mnt-routes:     AVEA-MNT
created:        2012-08-06T11:22:27Z
last-modified:  2012-08-06T11:22:27Z
source:         RIPE

organisation:   ORG-ITHA1-RIPE
org-name:       TT Mobil Iletisim Hizmetleri A.S
country:        TR
org-type:       LIR
address:        Gayrettepe Mah. Yildiz Posta Cad. 40 Bodrum Kat Oda 13
address:        34349
address:        Besiktas, ISTANBUL
address:        TURKEY
phone:          +903125550000
fax-no:         +902164606802
abuse-c:        AR17323-RIPE
admin-c:        NK1283-RIPE
admin-c:        NO638-RIPE
admin-c:        GA11360-RIPE
mnt-ref:        RIPE-NCC-HM-MNT
mnt-ref:        AVEA-MNT
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         AVEA-MNT
created:        2004-04-17T12:07:05Z
last-modified:  2020-12-16T13:06:54Z
source:         RIPE # Filtered

role:           AVEA admin
address:        Avea Iletisim Hizmetleri A.S.
address:        Abdi Ipekçi Cad. No.75 Maçka / Istanbul
phone:          +902124601500
fax-no:         +902164606802
admin-c:        TTBA1-RIPE
tech-c:         TTBA1-RIPE
nic-hdl:        Aa3018-RIPE
remarks:        ************************************************************************
remarks:        Please report abuse incidents ONLY to < abuse@turktelekom.com.tr>
remarks:        ************************************************************************
mnt-by:         AVEA-MNT
created:        2009-12-24T08:39:51Z
last-modified:  2021-10-05T14:32:31Z
source:         RIPE # Filtered

% Information related to '5.176.0.0/15AS20978'

route:          5.176.0.0/15
descr:          Avea Iletisim Hizmetleri A.S.
origin:         AS20978
mnt-lower:      AVEA-MNT
mnt-routes:     AVEA-MNT
mnt-by:         AVEA-MNT
created:        2012-08-06T12:15:42Z
last-modified:  2012-08-06T12:15:42Z
source:         RIPE

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

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