% 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 '138.231.0.0 - 138.231.255.255'

% Abuse contact for '138.231.0.0 - 138.231.255.255' is 'abuse@ens-cachan.fr'

inetnum:        138.231.0.0 - 138.231.255.255
netname:        FR-ENS-CACHAN
org:            ORG-ENSC1-RIPE
country:        FR
admin-c:        JC8167-RIPE
tech-c:         PS12581-RIPE
tech-c:         SL6692-RIPE
tech-c:         AM37986-RIPE
status:         LEGACY
mnt-by:         RIPE-NCC-LEGACY-MNT
mnt-by:         RENATER-MNT
created:        2002-04-12T15:13:15Z
last-modified:  2020-11-16T17:43:55Z
source:         RIPE
sponsoring-org: ORG-RA8-RIPE

organisation:   ORG-ENSC1-RIPE
org-name:       Ecole Normale Superieure Paris-Saclay EPSCP
country:        FR
org-type:       OTHER
descr:          Ecole Normale Superieure de Cachan
address:        61 avenue du President Wilson
address:        94235 Cachan
admin-c:        JC8167-RIPE
tech-c:         PS12581-RIPE
tech-c:         SL6692-RIPE
tech-c:         AM37986-RIPE
abuse-c:        EA5341-RIPE
mnt-ref:        RENATER-MNT
mnt-by:         RENATER-MNT
created:        2015-08-27T12:53:19Z
last-modified:  2024-05-23T13:01:30Z
source:         RIPE # Filtered

person:         Aurelien MINET
address:        Ecole Normale Superieure
address:        61 avenue du President Wilson
address:        94235 Cachan Cedex
address:        FRANCE
phone:          +33 1 47 40 74 24
nic-hdl:        AM37986-RIPE
mnt-by:         RENATER-MNT
remarks:        changed:        rensvp@renater.fr 20150827
created:        2015-08-27T07:58:03Z
last-modified:  2015-08-27T07:58:03Z
source:         RIPE # Filtered

person:         Jamel CHAABANE
address:        Ecole Normale Superieure
address:        61 av du President Wilson
address:        94235 Cachan
address:        FRANCE
phone:          +33 1 47 40 74 24
nic-hdl:        JC8167-RIPE
mnt-by:         RENATER-MNT
remarks:        changed:        rensvp@renater.fr 20150827
created:        2015-08-27T07:58:03Z
last-modified:  2015-08-27T07:58:03Z
source:         RIPE # Filtered

person:         Pascal SOULLARD
address:        Ecole Normale Superieure
address:        61 av du President Wilson
address:        94235 Cachan
address:        FRANCE
phone:          +33 1 47 40 74 24
nic-hdl:        PS12581-RIPE
mnt-by:         RENATER-MNT
remarks:        changed:        rensvp@renater.fr 20120106
remarks:        changed:        rensvp@renater.fr 20150827
created:        2012-01-06T08:36:00Z
last-modified:  2015-08-27T07:58:03Z
source:         RIPE # Filtered

person:         Sabrina LOUISON-FRANCOIS
address:        Ecole Normale Superieure
address:        61 avenue du President Wilson
address:        94235 Cachan Cedex
address:        FRANCE
phone:          +33 1 47 40 74 24
nic-hdl:        SL6692-RIPE
mnt-by:         RENATER-MNT
remarks:        changed:        rensvp@renater.fr 20120106
remarks:        changed:        rensvp@renater.fr 20150827
created:        2012-01-06T08:36:00Z
last-modified:  2015-08-27T07:58:03Z
source:         RIPE # Filtered

% Information related to '138.231.0.0/16AS2200'

route:          138.231.0.0/16
descr:          FR-ENS-CACHAN
origin:         AS2200
mnt-by:         RENATER-MNT
remarks:        changed:        RenSVP@Renater.fr 20200916
created:        2020-09-16T06:50:11Z
last-modified:  2020-09-16T06:50:11Z
source:         RIPE

% Information related to '138.231.0.0/16AS2269'

route:          138.231.0.0/16
descr:          FR-ENS-CACHAN
origin:         AS2269
mnt-by:         RENATER-MNT
remarks:        changed:        RenSVP@Renater.fr 20200916
created:        2020-09-16T06:50:11Z
last-modified:  2020-09-16T06:50:11Z
source:         RIPE

% This query was served by the RIPE Database Query Service version 1.113.2 (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