% 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 '116.51.29.192 - 116.51.29.255'

% Abuse contact for '116.51.29.192 - 116.51.29.255' is 'ap.eis-netops@global.ntt'

inetnum:        116.51.29.192 - 116.51.29.255
netname:        NTT-BIOTRONIC
descr:          NTT-BIOTRONIC
country:        SG
admin-c:        NTTS11-AP
tech-c:         NTTS11-AP
abuse-c:        AS3149-AP
status:         ASSIGNED NON-PORTABLE
mnt-by:         MAINT-SG-GIN
mnt-irt:        IRT-SG-GIN
last-modified:  2021-06-23T01:56:57Z
source:         APNIC

irt:            IRT-SG-GIN
address:        NTT Singapore Pte Ltd
address:        8 Kallang Avenue
address:
e-mail:         ap.eis-netops@global.ntt
abuse-mailbox:  ap.eis-netops@global.ntt
admin-c:        IEA3-AP
tech-c:         IEA3-AP
auth:           # Filtered
remarks:        ap.eis-netops@global.ntt was validated on 2026-03-25
mnt-by:         MAINT-SG-GIN
last-modified:  2026-05-21T04:15:52Z
source:         APNIC

role:           ABUSE SGGIN
country:        ZZ
address:        NTT Singapore Pte Ltd
address:        8 Kallang Avenue
address:
phone:          +000000000
e-mail:         ap.eis-netops@global.ntt
admin-c:        IEA3-AP
tech-c:         IEA3-AP
nic-hdl:        AS3149-AP
remarks:        Generated from irt object IRT-SG-GIN
remarks:        ap.eis-netops@global.ntt was validated on 2026-03-25
abuse-mailbox:  ap.eis-netops@global.ntt
mnt-by:         APNIC-ABUSE
last-modified:  2026-03-25T10:48:21Z
source:         APNIC

person:         NTT SINGAPORE - HOSTMASTER
address:        NTT SINGAPORE PTE LTD
address:        20 CECIL STREET, EQUITY PLAZA
address:        LEVEL 11, SINGAPORE 049705
country:        SG
phone:          +65 6438-3101
e-mail:         hostmaster@ntt.com.sg
nic-hdl:        NTTS11-AP
mnt-by:         MAINT-NTTS-HOSTMASTER
last-modified:  2009-09-30T03:31:32Z
source:         APNIC

% Information related to '116.51.16.0/20AS2914'

route:          116.51.16.0/20
origin:         AS2914
descr:          NTT Singapore Pte Ltd
                20 WEST PASIR PANJANG ROAD, #11-28
                MAPLE TREE BUSINESS CITY
mnt-by:         MAINT-NTTS-HOSTMASTER
last-modified:  2019-11-13T08:33:08Z
source:         APNIC

% This query was served by the APNIC Whois Service version 1.88.48 (WHOIS-AU5)