% 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 '115.187.74.0 - 115.187.74.255'

% Abuse contact for '115.187.74.0 - 115.187.74.255' is 'abuse@grnt.ne.jp'

inetnum:        115.187.74.0 - 115.187.74.255
netname:        GRNT-V32-1
descr:          GreenNet Co.,Ltd.
country:        JP
admin-c:        NM174-AP
tech-c:         NM174-AP
abuse-c:        AG721-AP
status:         ALLOCATED NON-PORTABLE
notify:         apnic@grnt.ne.jp
mnt-by:         MAINT-GRNT-JP
mnt-lower:      MAINT-GRNT-JP
mnt-routes:     MAINT-GRNT-JP
mnt-irt:        IRT-GRNT-JP
last-modified:  2021-01-27T23:40:14Z
source:         APNIC

irt:            IRT-GRNT-JP
address:        1-38-19 Matubara, Setagaya-ku, Tokyo
e-mail:         abuse@grnt.ne.jp
abuse-mailbox:  abuse@grnt.ne.jp
admin-c:        NM174-AP
tech-c:         NM174-AP
auth:           # Filtered
remarks:        abuse@grnt.ne.jp is invalid
notify:         apnic@grnt.ne.jp
mnt-by:         MAINT-GRNT-JP
last-modified:  2025-11-18T00:26:30Z
source:         APNIC

role:           ABUSE GRNTJP
country:        ZZ
address:        1-38-19 Matubara, Setagaya-ku, Tokyo
phone:          +000000000
e-mail:         abuse@grnt.ne.jp
admin-c:        NM174-AP
tech-c:         NM174-AP
nic-hdl:        AG721-AP
remarks:        Generated from irt object IRT-GRNT-JP
remarks:        abuse@grnt.ne.jp is invalid
abuse-mailbox:  abuse@grnt.ne.jp
mnt-by:         APNIC-ABUSE
last-modified:  2025-10-15T13:07:48Z
source:         APNIC

role:           Network Manager
address:        2-7-2 Hatagaya,Shibuya-ku,Tokyo
country:        JP
phone:          +81-3-3320-2062
e-mail:         apnic@grnt.ne.jp
admin-c:        NM174-AP
tech-c:         NM174-AP
nic-hdl:        NM174-AP
notify:         apnic@grnt.ne.jp
mnt-by:         MAINT-GRNT-JP
last-modified:  2012-03-04T01:32:17Z
source:         APNIC

% This query was served by the APNIC Whois Service version 1.88.34 (WHOIS-AU4)