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

% [whois.apnic.net]
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% Information related to '203.84.200.0 - 203.84.207.255'

% Abuse contact for '203.84.200.0 - 203.84.207.255' is 'rir-abuse@yahooinc.com'

inetnum:        203.84.200.0 - 203.84.207.255
netname:        YAHOO-APAC
descr:          Yahoo APAC
country:        SG
admin-c:        YI12-AP
tech-c:         YI12-AP
abuse-c:        AY527-AP
status:         ALLOCATED NON-PORTABLE
mnt-by:         MAINT-AP-YAHOO-INC
mnt-irt:        IRT-YAHOO-AP
last-modified:  2023-10-27T01:08:17Z
source:         APNIC

irt:            IRT-YAHOO-AP
address:        701 First Avenue
address:        Sunnyvale, CA 94089
e-mail:         rir-admin@yahooinc.com
abuse-mailbox:  rir-abuse@yahooinc.com
admin-c:        YI12-AP
tech-c:         YI12-AP
auth:           # Filtered
remarks:        rir-abuse@yahooinc.com was validated on 2025-08-27
remarks:        rir-admin@yahooinc.com is invalid
mnt-by:         MAINT-AP-YAHOO-INC
last-modified:  2026-01-07T13:07:59Z
source:         APNIC

role:           ABUSE YAHOOAP
country:        ZZ
address:        701 First Avenue
address:        Sunnyvale, CA 94089
phone:          +000000000
e-mail:         rir-admin@yahooinc.com
admin-c:        YI12-AP
tech-c:         YI12-AP
nic-hdl:        AY527-AP
remarks:        Generated from irt object IRT-YAHOO-AP
remarks:        rir-abuse@yahooinc.com was validated on 2025-08-27
remarks:        rir-admin@yahooinc.com is invalid
abuse-mailbox:  rir-abuse@yahooinc.com
mnt-by:         APNIC-ABUSE
last-modified:  2026-01-07T13:09:03Z
source:         APNIC

role:           YAHOO INC
address:        701 First Avenue
address:        Sunnyvale, CA 94089
country:        US
phone:          +1 408 349 3300
fax-no:         +1 408 349 3301
e-mail:         rir-admin@yahooinc.com
remarks:        send spam and abuse reports to rir-abuse@yahooinc.com
remarks:        or visit http://abuse.yahoo.com
admin-c:        KT615-AP
tech-c:         KT615-AP
nic-hdl:        YI12-AP
notify:         netops@yahoo-inc.com
mnt-by:         MAINT-AP-YAHOO-INC
last-modified:  2022-12-06T10:12:37Z
source:         APNIC

% Information related to '203.84.200.0/21AS10229'

route:          203.84.200.0/21
descr:          Yahoo Taiwan TW1
origin:         AS10229
mnt-by:         MAINT-AP-YAHOO-INC
last-modified:  2019-08-01T07:47:31Z
source:         APNIC

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