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

% This is the AfriNIC Whois server.
% The AFRINIC whois database is subject to  the following terms of Use. See https://afrinic.net/whois/terms

% Note: this output has been filtered.
%       To receive output for a database update, use the "-B" flag.

% Information related to '146.64.0.0 - 146.64.255.255'

% No abuse contact registered for 146.64.0.0 - 146.64.255.255

inetnum:        146.64.0.0 - 146.64.255.255
netname:        CSIRNET
descr:          "Centre for Advanced Computing "
descr:          and Decision Support
descr:          P.O. Box 395
descr:          Pretoria
descr:          0001
country:        ZA
org:            ORG-CSIR1-AFRINIC
admin-c:        AJ14-AFRINIC
tech-c:         AJ14-AFRINIC
status:         ASSIGNED PI
mnt-by:         AFRINIC-HM-MNT
mnt-lower:      TF-146-64-MNT
source:         AFRINIC # Filtered
parent:         0.0.0.0 - 255.255.255.255

organisation:   ORG-CSIR1-AFRINIC
org-name:       CSIR - Council for Scientific and Industrial Research
org-type:       EU-PI
country:        ZA
address:        CSIR Building 9
address:        P.O. Box 395
address:        Pretoria
address:        0001
address:        Pretoria
phone:          tel:+27-12-841-2555
admin-c:        AJ14-AFRINIC
tech-c:         AJ14-AFRINIC
mnt-ref:        AFRINIC-HM-MNT
mnt-by:         AFRINIC-HM-MNT
source:         AFRINIC # Filtered

person:         Aldrin Joseph
address:        CSIR
address:        P.O Box 395
address:        Pretoria South Africa 0001
address:        ZA
phone:          tel:+27-12-841-2555
fax-no:         tel:+27-12-841-4109
nic-hdl:        AJ14-AFRINIC
remarks:        CSIR ICT Operations Team Leader
mnt-by:         GENERATED-XMLJ8DKVWQ4YJGXZWEQBDBWOCS62KIQM-MNT
source:         AFRINIC # Filtered

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