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

% IP Client: 203.119.106.26
 
% 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.
%  2025-12-23 17:38:33 (-03 -03:00)

inetnum:     2800:a0::/28
status:      allocated
aut-num:     N/A
owner:       Administracion Nacional de Telecomunicaciones
ownerid:     UY-ANTA-LACNIC
responsible: ANTEL URUGUAY
address:     Guatemala, 1075, Torre de las Telecomunicaciones
address:     11800 - Montevideo - Montevideo
country:     UY
phone:       +598  29280000 [0000]
owner-c:     IIA17
tech-c:      ANU
abuse-c:     ANU
inetrev:     2800:a0::/28
nserver:     NS1.ANTELDATA.COM.UY
nsstat:      20251222 AA
nslastaa:    20251222
nserver:     NS2.ANTELDATA.COM.UY
nsstat:      20251222 AA
nslastaa:    20251222
created:     20070115
changed:     20070115

nic-hdl:     IIA17
person:      Ingeniería Internacional Antel
e-mail:      uai@antel.com.uy
address:     Guatemala, 1075, Torre de las Telecomunicaciones
address:     11800 - Montevideo - Montevideo
country:     UY
phone:       +598  29280000 [0000]
created:     20240118
changed:     20240601

nic-hdl:     ANU
person:      ANTEL URUGUAY
e-mail:      ipadmin@antel.net.uy
address:     Mercedes, 876, P. 2
address:     11100 - Montevideo - 
country:     UY
phone:       +598  29002877 [0000]
created:     20020910
changed:     20240117

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