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

% This is the RIPE Database query service.
% The objects are in RPSL format.
%
% The RIPE Database is subject to Terms and Conditions.
% See https://docs.db.ripe.net/terms-conditions.html

% Note: this output has been filtered.
%       To receive output for a database update, use the "-B" flag.

% Information related to '193.104.90.0 - 193.104.90.255'

% Abuse contact for '193.104.90.0 - 193.104.90.255' is 'sf@am-gmbh.de'

inetnum:        193.104.90.0 - 193.104.90.255
netname:        AM-NET
country:        DE
org:            ORG-AA556-RIPE
admin-c:        SF5143-RIPE
tech-c:         SR16720-RIPE
status:         ASSIGNED PI
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         MNT-SF
mnt-routes:     DTAG-RR
mnt-domains:    DTAG-NIC
created:        2009-10-28T13:01:03Z
last-modified:  2024-10-10T09:41:13Z
source:         RIPE

organisation:   ORG-AA556-RIPE
org-name:       AM-GmbH
country:        DE
org-type:       LIR
address:        Feldstrasse 34
address:        59872
address:        Meschede
address:        GERMANY
phone:          +4929120256116
fax-no:         +4929120256119
abuse-c:        AR14494-RIPE
mnt-ref:        RIPE-NCC-HM-MNT
mnt-ref:        MNT-SF
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         MNT-SF
created:        2009-10-20T09:52:44Z
last-modified:  2020-12-16T13:43:14Z
source:         RIPE # Filtered

person:         Stefan Friedl
address:        Feldstr. 34 59872 Meschede
phone:          +4929120256116
nic-hdl:        SF5143-RIPE
created:        2009-10-22T08:08:31Z
last-modified:  2016-04-06T19:36:45Z
mnt-by:         RIPE-NCC-LOCKED-MNT
source:         RIPE

person:         Stefan Rott
address:        Feldstraße 34, 59872 Meschede
phone:          +4915153812767
nic-hdl:        SR16720-RIPE
mnt-by:         MNT-SF
created:        2024-10-10T09:38:43Z
last-modified:  2024-10-10T09:38:43Z
source:         RIPE

% Information related to '193.104.90.0/24AS3320'

route:          193.104.90.0/24
descr:          AM-GmbH
origin:         AS3320
mnt-by:         DTAG-RR
created:        2010-04-29T09:05:40Z
last-modified:  2010-04-29T09:05:40Z
source:         RIPE

% This query was served by the RIPE Database Query Service version 1.120 (BUSA)