% APNIC found the following authoritative answer from: whois.apnic.net

% [whois.apnic.net]
% Whois data copyright terms    http://www.apnic.net/db/dbcopyright.html

% Information related to '121.121.0.0 - 121.121.255.255'

% Abuse contact for '121.121.0.0 - 121.121.255.255' is 'abuse@maxis.com.my'

inetnum:        121.121.0.0 - 121.121.255.255
netname:        MAXISNET-HSDPA
descr:          Maxis Broadband Sdn Bhd
country:        MY
admin-c:        MO113-AP
tech-c:         MO113-AP
status:         ASSIGNED NON-PORTABLE
mnt-by:         MAINT-MY-MAXIS
last-modified:  2009-05-08T03:45:26Z
source:         APNIC

person:         Maxis Network and Security Operations
nic-hdl:        MO113-AP
remarks:        Please send spam report, virus alert or any others
remarks:        abuse report trouble to abuse@maxis.com.my
e-mail:         abuse@maxis.com.my
address:        Level 19, Menara Maxis,
address:        KLCC, 50088 Kuala Lumpur
address:        Malaysia
phone:          +603-2330-7500
fax-no:         +603-2330-0587
country:        MY
mnt-by:         MAINT-MY-MAXIS
last-modified:  2008-11-07T08:55:51Z
source:         APNIC

% Information related to '121.121.0.0/16AS9534'

route:          121.121.0.0/16
origin:         AS9534
descr:          Maxis Broadband Sdn.Bhd
                Level 14, Menara Maxis,
                Kuala Lumpur City Centre,
                Off Jalan Ampang
mnt-by:         MAINT-MY-MAXIS
last-modified:  2020-08-11T04:07:02Z
source:         APNIC

% This query was served by the APNIC Whois Service version 1.88.36-SNAPSHOT (WHOIS-AU5)