% 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 '137.255.32.0 - 137.255.47.255'

% No abuse contact registered for 137.255.32.0 - 137.255.47.255

inetnum:        137.255.32.0 - 137.255.47.255
netname:        SBIN-SA-CUSTOMER
descr:          Bloc  SBIN SA allocated to SBIN-SA Customers
country:        BJ
admin-c:        VA15-AFRINIC
admin-c:        BK29-AFRINIC
tech-c:         VA15-AFRINIC
tech-c:         BK29-AFRINIC
status:         ASSIGNED PA
mnt-by:         SBDN-MNT
source:         AFRINIC # Filtered
parent:         137.255.0.0 - 137.255.255.255

person:         Bocar KELLY
nic-hdl:        BK29-AFRINIC
address:        Immeuble Houngbedji (à côté de la Direction de l’Emigration et de l’Immigration) Av. Jean Paul II Cotonou
address:        Cotonou
address:        Benin
phone:          tel:+229-53211335
mnt-by:         GENERATED-HDAVWFUP6FL4ILKIULCZ0ROV2KW8QM6O-MNT
source:         AFRINIC # Filtered

person:         Vivien ASSANGBE
nic-hdl:        VA15-AFRINIC
address:        Immeuble Houngbedji  (à côté de la Direction de l’Emigration et de l’Immigration) Av. Jean Paul II Cotonou
address:        Cotonou
address:        Benin
phone:          tel:+229-90-09-68-29
phone:          tel:+229-40100109
mnt-by:         GENERATED-KKOMGRTHGEQHUUY7UHUSQ0ZXN6US1YVT-MNT
source:         AFRINIC # Filtered

% Information related to '137.255.0.0/16AS28683'

route:          137.255.0.0/16
descr:          BENIN TELECOMS INFRASTRUCTURES SA
origin:         AS28683
source:         AFRINIC # Filtered
mnt-by:         SBDN-MNT
mnt-lower:      SBDN-MNT

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