% 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 '196.21.0.0 - 196.21.31.255'

% Abuse contact for '196.21.0.0 - 196.21.31.255' is 'abuse@tenet.ac.za'

inetnum:        196.21.0.0 - 196.21.31.255
netname:        TENET-LIR
descr:          TENET
descr:          House Vincent
descr:          Wynberg Mews
descr:          10 Brodie Road
descr:          Wynberg 7800
country:        ZA
admin-c:        RJ1-AFRINIC
tech-c:         AA28-AFRINIC
status:         ASSIGNED PA
mnt-by:         TF-192-96-MNT
mnt-lower:      TF-196-21-MNT
source:         AFRINIC # Filtered
parent:         196.21.0.0 - 196.21.255.255

person:         Andrew Alston
address:        Tertiary Education Network
address:        House Vincent
address:        Wynberg Mews
address:        10 Brodie Street
address:        Wynberg, Cape Town
address:        7800
address:        ZA
phone:          tel:+27-21-763-7181
fax-no:         tel:+27-21-763-7117
nic-hdl:        AA28-AFRINIC
mnt-by:         GENERATED-Z9ETELJJVRXZIDZEGBSONG25LUZQQW0E-MNT
source:         AFRINIC # Filtered

person:         Richard Jonathan
nic-hdl:        RJ1-AFRINIC
address:        Tertiary Education and Research
address:        Network of South Africa NPC
address:        3rd Floor, DBM Gardens
address:        Golf Park, Raapenberg Rd
address:        Mowbray 7700
address:        South Africa
phone:          tel:+27-21-763-7140
mnt-by:         GENERATED-H1YIQQQPHJOXVPJSRXSFAEACUYMQR52I-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