% 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 '139.20.0.0 - 139.20.255.255'

% Abuse contact for '139.20.0.0 - 139.20.255.255' is 'abuse@dfn.de'

inetnum:        139.20.0.0 - 139.20.255.255
netname:        TUBANET
org:            ORG-TUBF1-RIPE
country:        DE
admin-c:        AK5277-RIPE
tech-c:         RK477-RIPE
status:         LEGACY
mnt-by:         DFN-LIR-MNT
mnt-by:         RIPE-NCC-LEGACY-MNT
mnt-irt:        IRT-DFN-CERT
created:        1970-01-01T00:00:00Z
last-modified:  2020-11-16T17:43:37Z
source:         RIPE
sponsoring-org: ORG-DV1-RIPE

organisation:   ORG-TUBF1-RIPE
org-name:       Technische Universitaet Bergakademie Freiberg
country:        DE
org-type:       OTHER
address:        Bernhard-von-Cotta-Str. 1
address:        09599 Freiberg
address:        Germany
admin-c:        AK5277-RIPE
tech-c:         RK477-RIPE
abuse-c:        DH5989-RIPE
mnt-ref:        DFN-LIR-MNT
mnt-by:         DFN-LIR-MNT
created:        2010-06-02T12:51:23Z
last-modified:  2022-12-01T17:31:39Z
source:         RIPE # Filtered

person:         Andreas Kluge
address:        TU Bergakademie Freiberg
address:        Universitaetsrechenzentrum
address:        Bernhard-von-Cotta-Str. 1
address:        09599 Freiberg
address:        Germany
phone:          +49 3731 39 3112
fax-no:         +49 3731 39 4020
nic-hdl:        AK5277-RIPE
mnt-by:         DFN-NTFY
created:        2007-08-29T08:11:37Z
last-modified:  2007-08-29T08:11:37Z
source:         RIPE # Filtered

person:         Reiner Kroenert
address:        TU Bergakademie Freiberg
address:        Universitaetsrechenzentrum
address:        Bernhard-von-Cotta-Str. 1
address:        09599 Freiberg
address:        Germany
phone:          +49 3731 39 4025
fax-no:         +49 3731 39 4020
nic-hdl:        RK477-RIPE
mnt-by:         DFN-NTFY
created:        1970-01-01T00:00:00Z
last-modified:  2007-08-29T08:11:37Z
source:         RIPE # Filtered

% Information related to '139.20.0.0/16AS1275'

route:          139.20.0.0/16
descr:          TUBANET
origin:         AS1275
mnt-by:         DFN-MNT
created:        1970-01-01T00:00:00Z
last-modified:  2001-09-22T09:32:37Z
source:         RIPE

% Information related to '139.20.0.0/16AS680'

route:          139.20.0.0/16
descr:          TUBANET
origin:         AS680
mnt-by:         DFN-MNT
created:        1970-01-01T00:00:00Z
last-modified:  2001-09-22T09:33:18Z
source:         RIPE

% This query was served by the RIPE Database Query Service version 1.112 (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