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

% [whois.apnic.net]
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% Information related to '72.255.238.192 - 72.255.238.207'

% Abuse contact for '72.255.238.192 - 72.255.238.207' is 'noc@imsbiz.com'

inetnum:        72.255.238.192 - 72.255.238.207
netname:        YEWCHUNGINTLSCH-HK
descr:          YEW CHUNG INTERNATIONAL SCHOOL
country:        HK
admin-c:        BNA2-AP
tech-c:         TA66-AP
abuse-c:        AP706-AP
status:         ALLOCATED NON-PORTABLE
mnt-by:         MAINT-HK-IMS-CS
mnt-irt:        IRT-PCCW-BIA-HK
last-modified:  2023-11-14T06:33:59Z
source:         APNIC

irt:            IRT-PCCW-BIA-HK
address:        PO Box 9896 GPO
e-mail:         noc@imsbiz.com
abuse-mailbox:  noc@imsbiz.com
admin-c:        TA66-AP
tech-c:         TA66-AP
auth:           # Filtered
remarks:        noc@imsbiz.com
remarks:        noc@imsbiz.com was validated on 2025-10-02
mnt-by:         MAINT-HK-PCCW-BIA
last-modified:  2025-11-18T00:26:32Z
source:         APNIC

role:           ABUSE PCCWBIAHK
country:        ZZ
address:        PO Box 9896 GPO
phone:          +000000000
e-mail:         noc@imsbiz.com
admin-c:        TA66-AP
tech-c:         TA66-AP
nic-hdl:        AP706-AP
remarks:        Generated from irt object IRT-PCCW-BIA-HK
remarks:        noc@imsbiz.com was validated on 2025-10-02
abuse-mailbox:  noc@imsbiz.com
mnt-by:         APNIC-ABUSE
last-modified:  2025-10-02T01:16:59Z
source:         APNIC

role:           BIZ NETVIGATOR ADMINISTRATORS
address:        27/F, PCCW Tower, Taikoo Place,
address:        979 King's Road, Quarry Bay, HK
country:        HK
phone:          +852-2888-6932
e-mail:         cs@imsbiz.com
admin-c:        EC496-AP
admin-c:        AT385-AP
tech-c:         NOC18-AP
tech-c:         WC109-AP
nic-hdl:        BNA2-AP
notify:         noc@imsbiz.com
mnt-by:         MAINT-HK-PCCW-BIA
last-modified:  2018-01-02T11:32:47Z
source:         APNIC

role:           TECHNICAL ADMINISTRATORS
address:        HKT Limited
address:        PO Box 9896 GPO
phone:          +852-2883-5151
country:        HK
e-mail:         noc@imsbiz.com
admin-c:        NOC18-AP
admin-c:        WC109-AP
tech-c:         NOC18-AP
tech-c:         WC109-AP
nic-hdl:        TA66-AP
notify:         noc@imsbiz.com
mnt-by:         MAINT-HK-PCCW-BIA
last-modified:  2016-07-15T04:03:30Z
source:         APNIC

% Information related to '72.255.224.0/19AS4515'

route:          72.255.224.0/19
origin:         AS4515
descr:          PCCW IMS Ltd (PCCW Business Internet Access)
                26/F, PCCW TOWER
                TAIKOO PLACE
                979 KINGS ROAD
                QUARRY BAY, HONG KONG
mnt-by:         MAINT-HK-STAR
last-modified:  2020-11-20T03:45:42Z
source:         APNIC

% Information related to '72.255.224.0/19AS4760'

route:          72.255.224.0/19
origin:         AS4760
descr:          PCCW IMS Ltd (PCCW Business Internet Access)
                26/F, PCCW TOWER
                TAIKOO PLACE
                979 KINGS ROAD
                QUARRY BAY, HONG KONG
mnt-by:         MAINT-HK-STAR
last-modified:  2020-11-20T03:46:09Z
source:         APNIC

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