% 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 '2a0a:a541::/32'

% Abuse contact for '2a0a:a541::/32' is 'abuse@netcologne.de'

inet6num:       2a0a:a541::/32
netname:        NC-DIAL-IN-POOL-V6
descr:          NetCologne dynamic IP Pool
descr:          Am Coloneum 9
descr:          D-50829 Koeln
country:        DE
admin-c:        NC1424-RIPE
tech-c:         NC1424-RIPE
status:         AGGREGATED-BY-LIR
assignment-size: 48
mnt-by:         NETCOLOGNE-MNT
remarks:        + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
remarks:        + abuse@netcologne.de is contact for reports and complaints +
remarks:        + about criminal use, network abuse, spam, etc. originating +
remarks:        + from IP addresses assigned to NetCologne.                 +
remarks:        + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
created:        2017-04-24T12:08:13Z
last-modified:  2017-04-24T12:08:13Z
source:         RIPE

role:           Administrator Contact NetCologne
address:        NetCologne Gesellschaft fuer Telekommunikation mbH
address:        Am Coloneum 9
address:        D-50829 Koeln
address:        Germany
phone:          +49 221 2222-0
fax-no:         +49-221-2222-620
nic-hdl:        NC1424-RIPE
admin-c:        MR111-RIPE
tech-c:         GN194-RIPE
tech-c:         MA1830-RIPE
remarks:        + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
remarks:        + abuse@netcologne.de is contact for criminal use, spam, etc. +
remarks:        + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
abuse-mailbox:  abuse@netcologne.de
mnt-by:         NETCOLOGNE-MNT
created:        1970-01-01T00:00:00Z
last-modified:  2021-11-19T13:31:09Z
source:         RIPE # Filtered

% Information related to '2a0a:a540::/29AS8422'

route6:         2a0a:a540::/29
descr:          NetCologne GmbH
descr:          Am Coloneum 9
descr:          50829 Koeln
origin:         AS8422
mnt-by:         NETCOLOGNE-MNT
created:        2017-04-24T09:25:50Z
last-modified:  2017-04-24T09:25:50Z
source:         RIPE

% This query was served by the RIPE Database Query Service version 1.114 (SHETLAND)

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