% 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://apps.db.ripe.net/docs/HTML-Terms-And-Conditions

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

% Information related to '2001:638:504::/48'

% Abuse contact for '2001:638:504::/48' is 'abuse@dfn.de'

inet6num:       2001:638:504::/48
netname:        UNIBI
descr:          Universitaet Bielefeld
descr:          Germany
country:        DE
admin-c:        NUoB1-RIPE
tech-c:         NUoB1-RIPE
mnt-by:         DFN-HM-MNT
status:         ASSIGNED
created:        2003-11-25T14:44:43Z
last-modified:  2003-11-25T14:44:43Z
source:         RIPE # Filtered

role:           Netmaster University of Bielefeld
address:        NOC at HRZ
address:        Universitaet Bielefeld
address:        Universitaetsstrasse 25
address:        33615 Bielefeld
address:        Germany
phone:          +49 521 106 12399
abuse-mailbox:  abuse@uni-bielefeld.de
admin-c:        MABL1-RIPE
admin-c:        SL12767-RIPE
tech-c:         MABL1-RIPE
tech-c:         SL12767-RIPE
tech-c:         VW256-RIPE
nic-hdl:        NUoB1-RIPE
mnt-by:         DFN-NTFY
created:        2003-07-25T12:47:05Z
last-modified:  2019-01-07T13:05:49Z
source:         RIPE # Filtered

% Information related to '2001:638::/32AS680'

route6:         2001:638::/32
descr:          DFN-V6-AGG1
origin:         AS680
mnt-by:         DFN-MNT
mnt-routes:     ESANIC-MNT { 2001:638:30d::/48 }
created:        2005-06-23T15:23:59Z
last-modified:  2014-12-11T12:25:57Z
source:         RIPE

% This query was served by the RIPE Database Query Service version 1.111 (BUSA)

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