% 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 '129.206.0.0 - 129.206.255.255'

% Abuse contact for '129.206.0.0 - 129.206.255.255' is 'abuse@uni-heidelberg.de'

inetnum:        129.206.0.0 - 129.206.255.255
netname:        HD-NET
descr:          Ruprecht-Karls-Universitaet Heidelberg
descr:          Heidelberg, Germany
country:        DE
org:            ORG-UH5-RIPE
sponsoring-org: ORG-BA9-RIPE
admin-c:        UH593-RIPE
tech-c:         UH593-RIPE
status:         LEGACY
mnt-by:         RIPE-NCC-LEGACY-MNT
remarks:        **************************************************
remarks:        * DEFAULT ABUSE CONTACT: abuse@uni-heidelberg.de *
remarks:        **************************************************
mnt-by:         BELWUE-MNT
created:        1970-01-01T00:00:00Z
last-modified:  2023-03-22T08:53:46Z
source:         RIPE

organisation:   ORG-UH5-RIPE
org-name:       Universitaet Heidelberg
country:        DE
org-type:       OTHER
address:        Ruprecht-Karls-Universitaet Heidelberg
address:        Universitaetsrechenzentrum
address:        Im Neuenheimer Feld 293
address:        D-69120 Heidelberg
address:        Germany
fax-no:         +49 6221 54 20199
admin-c:        UH593-RIPE
tech-c:         UH593-RIPE
abuse-c:        UH593-RIPE
mnt-ref:        BELWUE-MNT
mnt-by:         BELWUE-MNT
created:        2014-02-05T09:48:22Z
last-modified:  2023-09-08T11:44:47Z
source:         RIPE # Filtered

role:           Universitaetsrechenzentrum Heidelberg
address:        Ruprecht-Karls-Universitaet Heidelberg
address:        Universitaetsrechenzentrum
address:        Im Neuenheimer Feld 293
address:        D-69120 Heidelberg
address:        Germany
phone:          +49 6221 54 20072
fax-no:         +49 6221 54 20199
admin-c:        MH18307-RIPE
tech-c:         JP11927-RIPE
nic-hdl:        UH593-RIPE
remarks:        **************************************************
remarks:        * DEFAULT ABUSE CONTACT: abuse@uni-heidelberg.de *
remarks:        **************************************************
abuse-mailbox:  abuse@uni-heidelberg.de
mnt-by:         BELWUE-MNT
created:        2011-02-09T15:45:42Z
last-modified:  2020-04-03T11:00:00Z
source:         RIPE # Filtered

% Information related to '129.206.0.0/16AS553'

route:          129.206.0.0/16
descr:          UNI-HEIDELBERG
origin:         AS553
mnt-by:         BELWUE-MNT
created:        1970-01-01T00:00:00Z
last-modified:  2001-09-22T09:32:38Z
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