% 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 '203.142.64.0 - 203.142.79.255'

% Abuse contact for '203.142.64.0 - 203.142.79.255' is 'abuse@biz.net.id'

inetnum:        203.142.64.0 - 203.142.79.255
netname:        BIZNET-ID
descr:          Biznet Networks
descr:          Internet Service Provider
descr:          Jakarta, Indonesia
country:        ID
admin-c:        AA590-AP
tech-c:         AA590-AP
remarks:        Send Spam & Abuse report to: abuse@biz.net.id
mnt-by:         MNT-APJII-ID
mnt-lower:      MAINT-ID-BIZNET
status:         ALLOCATED PORTABLE
mnt-irt:        IRT-BIZNET-ID
last-modified:  2021-07-09T08:52:55Z
source:         APNIC

irt:            IRT-BIZNET-ID
address:        Biznet Networks
address:        Midplaza 2, 8th Floor
address:        Jl. Jend Sudirman Kav 10-11
address:        Jakarta 10220
e-mail:         noc@biznetnetworks.com
abuse-mailbox:  abuse@biz.net.id
admin-c:        BA18-AP
tech-c:         BA18-AP
auth:           # Filtered
remarks:        abuse@biz.net.id was validated on 2024-08-20
mnt-by:         MAINT-ID-BIZNET
last-modified:  2024-08-29T03:10:00Z
source:         APNIC

person:         Agus Ariyanto
nic-hdl:        AA590-AP
e-mail:         agus_ariyanto@biz.net.id
address:        Midplaza 2, 8th Floor
address:        Jl. Jend Sudirman Kav 10-11
address:        Jakarta, Indonesia
phone:          +62-21-57998888
fax-no:         +62-21-5700580
country:        ID
mnt-by:         MAINT-ID-BIZNET
last-modified:  2008-09-04T07:54:14Z
source:         APNIC

% Information related to '203.142.64.80 - 203.142.64.95'

inetnum:        203.142.64.80 - 203.142.64.95
netname:        BIZNET-KORINDO-BLOCK
descr:          PT. Korindo Indonesia
descr:          Jakarta
country:        ID
admin-c:        AW151-AP
tech-c:         AW151-AP
mnt-by:         MAINT-ID-BIZNET
remarks:        Send Spam & Abuse Reports to : abuse@biz.net.id
status:         ASSIGNED NON-PORTABLE
mnt-irt:        IRT-BIZNET-ID
last-modified:  2011-02-07T08:01:50Z
source:         IDNIC

irt:            IRT-BIZNET-ID
address:        Biznet Networks
address:        Midplaza 2, 8th Floor
address:        Jl. Jend Sudirman Kav 10-11
address:        Jakarta 10220
e-mail:         noc@biznetnetworks.com
abuse-mailbox:  abuse@biz.net.id
admin-c:        BA18-AP
tech-c:         BA18-AP
auth:           # Filtered
mnt-by:         MAINT-ID-BIZNET
last-modified:  2024-08-22T04:54:11Z
source:         IDNIC

person:         Alexander Wenas
address:        Midplaza 2, 8th floor
address:        Jend.Sudirman Kav.10-11
address:        Jakarta 10220
address:        Indonesia
country:        ID
phone:          +62-21-570-8888
fax-no:         +62-21-570-0580
e-mail:         noc@biznetnetworks.com
nic-hdl:        AW151-AP
mnt-by:         MAINT-ID-BIZNET
last-modified:  2014-03-04T07:40:39Z
source:         IDNIC

% This query was served by the APNIC Whois Service version 1.88.25 (WHOIS-AU2)

Search for
IP address lookups			Miscellaneous queries
-l	1st level less specific		-i	Inverse attributes	None admin-c admin-c,tech-c,zone-c author cross-mnt cross-nfy local-as mbrs-by-ref member-of mnt-by mnt-lower mnt-nfy mnt-routes notify nserver origin person referral-by rev-srv sub-dom tech-c upd-to zone-c
-L	All less specific		-T	Object types	All as-block as-set aut-num domain filter-set inet-rtr inet6num inetnum irt key-cert mntner peering-set person role route route-set rtr-set
-m	1st level more specific
-M	All more specific		Query hints Include "AS" in front of an AS number. Example: AS4808 Include "-t" (template only) or "-v" (template and description) in front of an object name to view the template Example: -t inetnum
-x	Exact match only
-d	Associated reverse domain