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

% IP Client: 203.119.110.26
 
% Joint Whois - whois.lacnic.net
%  This server accepts single ASN, IPv4 or IPv6 queries

% LACNIC resource: whois.lacnic.net

% Copyright LACNIC lacnic.net
%  The data below is provided for information purposes
%  and to assist persons in obtaining information about or
%  related to AS and IP numbers registrations
%  By submitting a whois query, you agree to use this data
%  only for lawful purposes.
%  2026-01-20 10:16:11 (-03 -03:00)

inetnum:     170.51.0.0/20
status:      reallocated
aut-num:     N/A
owner:       AMX Paraguay SA
ownerid:     PY-APSA-LACNIC
responsible: Administrador de Direcciones IP
address:     Mariscal Lopez, 1730, 
address:     1100 - Asuncion - 
country:     PY
phone:       +595 991 2499000
owner-c:     ADL82
tech-c:      SAD3
abuse-c:     ACP96
created:     20170502
changed:     20210318
inetnum-up:  170.51.0.0/16
remarks:     Geofeed https://geofeed.claro.com.ar/geofeed.csv

nic-hdl:     ADL82
person:      Administrador Lacnic
e-mail:      adm_lacnic@claro.com.ar
address:     Av de Mayo, 878, 
address:     C1084AAQ - Buenos Aires - 
country:     AR
phone:       +54  1140003246
created:     20220602
changed:     20220602

nic-hdl:     SAD3
person:      IP Addressing AR
e-mail:      ipaddressing.ar@claro.com.ar
address:     Av. de Mayo, 878, -
address:     C1084AAQ - Bs.As, - CF
country:     AR
phone:       +54  1140011300 [34179]
created:     20060511
changed:     20211221

nic-hdl:     ACP96
person:      Abuse Claro PY
e-mail:      abuse@claro.com.py
address:     Av. De Mayo, 878, -
address:     1425 - Capital Federal - -- Select One --
country:     AR
phone:       +54  1141098823 [0000]
created:     20210312
changed:     20210313

% whois.lacnic.net accepts only direct match queries.
% Types of queries are: POCs, ownerid, CIDR blocks, IP
% and AS numbers.