% 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 '196.21.43.0 - 196.21.43.255'

% Abuse contact for '196.21.43.0 - 196.21.43.255' is 'abuse@tenet.ac.za'

inetnum:        196.21.43.0 - 196.21.43.255
netname:        NLSA-196-21-43-0
descr:          National Library of South Africa
descr:          17th Floor Old Mutual Centre
descr:          167 Andries Street
descr:          Pretoria
descr:          0001
country:        ZA
admin-c:        JWA29-AFRINIC
tech-c:         HW162-AFRINIC
status:         ASSIGNED PA
mnt-by:         TF-196-21-MNT
mnt-lower:      TF-196-21-MNT
source:         AFRINIC # Filtered
parent:         196.21.0.0 - 196.21.255.255

person:         Hendri Warricker
address:        National Library of South Africa
address:        239 Vermeulen Street
address:        Pretoria, South Africa 0001
address:        ZA
phone:          tel:+27-12-321-8931
nic-hdl:        HW162-AFRINIC
mnt-by:         GENERATED-92MQ4YKIZPI65ITNYADN52TXXQ8F73MZ-MNT
source:         AFRINIC # Filtered

person:         JH Warricker
address:        17th Floor Old Mutual Centre
address:        167 Andries Street
address:        Pretoria
address:        0001
address:        ZA
phone:          tel:+1-083-306-9146
phone:          tel:+1-012-321-8931
fax-no:         tel:+1-012-321-1128
nic-hdl:        JWA29-AFRINIC
mnt-by:         GENERATED-NSW3GS8DRPTY96ON6DGDSMTJKAO7412S-MNT
source:         AFRINIC # Filtered

% Information related to '196.21.0.0/16AS2018'

route:          196.21.0.0/16
descr:          MAINTAINED BY TENET
origin:         AS2018
mnt-by:         TNET-MNT01
source:         AFRINIC # Filtered