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



% [whois.apnic.net]
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% Information related to '103.15.20.0 - 103.15.23.255'

% Abuse contact for '103.15.20.0 - 103.15.23.255' is 'hostmaster@i-system.hk'

inetnum:        103.15.20.0 - 103.15.23.255
netname:        ISYSTEMTECH-HK
descr:          i-System Technology Limited
country:        HK
org:            ORG-ITL1-AP
admin-c:        HM1244-AP
tech-c:         HM1244-AP
status:         ALLOCATED PORTABLE
abuse-c:        AI530-AP
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:         APNIC-HM
mnt-lower:      MAINT-HK-ISYSTEMTECH
mnt-routes:     MAINT-HK-ISYSTEMTECH
mnt-irt:        IRT-ISYSTEMTECH-HK
last-modified:  2022-04-13T23:51:31Z
source:         APNIC

irt:            IRT-ISYSTEMTECH-HK
address:        Tsuen Wan, Hong Kong
e-mail:         hostmaster@i-system.hk
abuse-mailbox:  hostmaster@i-system.hk
admin-c:        HM1244-AP
tech-c:         HM1244-AP
auth:           # Filtered
remarks:        hostmaster@i-system.hk was validated on 2025-08-12
mnt-by:         MAINT-HK-ISYSTEMTECH
last-modified:  2025-11-18T00:26:22Z
source:         APNIC

organisation:   ORG-ITL1-AP
org-name:       i-System Technology Limited
org-type:       LIR
country:        HK
address:        Unit 2201, 22/F, King Palace Plaza,
address:        52A Sha Tsui Road,
phone:          +852-3579-4258
fax-no:         +852-3186-6705
e-mail:         info@i-system.hk
mnt-ref:        APNIC-HM
mnt-by:         APNIC-HM
last-modified:  2023-09-05T02:15:35Z
source:         APNIC

role:           ABUSE ISYSTEMTECHHK
country:        ZZ
address:        Tsuen Wan, Hong Kong
phone:          +000000000
e-mail:         hostmaster@i-system.hk
admin-c:        HM1244-AP
tech-c:         HM1244-AP
nic-hdl:        AI530-AP
remarks:        Generated from irt object IRT-ISYSTEMTECH-HK
remarks:        hostmaster@i-system.hk was validated on 2025-08-12
abuse-mailbox:  hostmaster@i-system.hk
mnt-by:         APNIC-ABUSE
last-modified:  2025-08-12T22:55:19Z
source:         APNIC

person:         Host Master
address:        Unit 2201, 22/F, King Palace Plaza,
                52A Sha Tsui Road, Tsuen Wan
country:        HK
phone:          +852-35794258
e-mail:         noc-admin@i-system.hk
nic-hdl:        HM1244-AP
mnt-by:         MAINT-HK-ISYSTEMTECH
last-modified:  2017-09-24T14:21:57Z
source:         APNIC

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