% 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 '115.66.57.0 - 115.66.57.255'

% Abuse contact for '115.66.57.0 - 115.66.57.255' is 'hostmaster@singnet.com.sg'

inetnum:        115.66.57.0 - 115.66.57.255
netname:        SINGTEL-FIBRE-115-66-57-0
descr:          SingNET Broadband
descr:          Singapore Telecommunications LTD
country:        SG
admin-c:        SH9-AP
tech-c:         SH9-AP
abuse-c:        AS2068-AP
status:         ALLOCATED NON-PORTABLE
remarks:        --------------------------------------------------------
remarks:        To report network abuse, please contact mnt-irt
remarks:        For troubleshooting, please contact tech-c and admin-c
remarks:        Report invalid contact via www.apnic.net/invalidcontact
remarks:        --------------------------------------------------------
mnt-by:         MAINT-SG-SINGNET
mnt-lower:      MAINT-SG-SINGNET
mnt-routes:     MAINT-SG-SINGNET
mnt-irt:        IRT-SINGNET-SG
last-modified:  2026-01-29T09:38:00Z
source:         APNIC

irt:            IRT-SINGNET-SG
address:        SingNet Engineering & Operations
address:        10 EUNOS ROAD 8,
address:        # 07-31, SINGAPORE POST CENTRE
address:        Singapore 408600
e-mail:         hostmaster@singnet.com.sg
abuse-mailbox:  hostmaster@singnet.com.sg
admin-c:        SH9-AP
tech-c:         SH9-AP
auth:           # Filtered
remarks:        hostmaster@singnet.com.sg was validated on 2026-01-29
mnt-by:         MAINT-SG-SINGNET
last-modified:  2026-01-29T08:58:12Z
source:         APNIC

role:           ABUSE SINGNETSG
country:        ZZ
address:        SingNet Engineering & Operations
address:        10 EUNOS ROAD 8,
address:        # 07-31, SINGAPORE POST CENTRE
address:        Singapore 408600
phone:          +000000000
e-mail:         hostmaster@singnet.com.sg
admin-c:        SH9-AP
tech-c:         SH9-AP
nic-hdl:        AS2068-AP
remarks:        Generated from irt object IRT-SINGNET-SG
remarks:        hostmaster@singnet.com.sg was validated on 2026-01-29
abuse-mailbox:  hostmaster@singnet.com.sg
mnt-by:         APNIC-ABUSE
last-modified:  2026-01-29T08:58:45Z
source:         APNIC

person:         SingNet Hostmaster
address:        SingNet Engineering & Operations
address:        10 EUNOS ROAD 8
address:        #07-31, SINGAPORE POST CENTRE
address:        SINGAPORE 408600
country:        SG
phone:          +65 7845922
fax-no:         +65 4753273
e-mail:         hostmaster@singnet.com.sg
nic-hdl:        SH9-AP
notify:         hostmaster@singnet.com.sg
mnt-by:         MAINT-SG-SINGNET
last-modified:  2026-01-29T09:43:29Z
source:         APNIC

% Information related to '115.66.57.0/24AS3758'

route:          115.66.57.0/24
origin:         AS3758
descr:          SingNet Pte Ltd
                c/o Singapore Telecommunications
                31 Exeter Road
                Comcentre Podium Block, #05-04
mnt-by:         MAINT-SG-SINGNET
last-modified:  2024-04-11T05:36:44Z
source:         APNIC

% Information related to '115.66.57.0/24AS9506'

route:          115.66.57.0/24
origin:         AS9506
descr:          SingNet Pte Ltd
                c/o Singapore Telecommunications
                31 Exeter Road
                Comcentre Podium Block, #05-04
mnt-by:         MAINT-SG-SINGNET
last-modified:  2024-07-17T02:49:51Z
source:         APNIC

% This query was served by the APNIC Whois Service version 1.88.47 (WHOIS-AU4)