% 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 'AS51357 - AS52223'

as-block:       AS51357 - AS52223
descr:          RIPE NCC ASN block
remarks:        These AS Numbers are assigned to network operators in the RIPE NCC service region.
mnt-by:         RIPE-NCC-HM-MNT
created:        2021-12-09T08:21:17Z
last-modified:  2021-12-09T08:21:17Z
source:         RIPE

% Information related to 'AS51933'

% Abuse contact for 'AS51933' is 'noc@alchimie.com'

aut-num:        AS51933
as-name:        Alchimie-AS
org:            ORG-CFS4-RIPE
import:         from AS174 accept any
import:         from AS3356 accept any
export:         to AS174 announce AS-ALCHIMIE
export:         to AS3356 announce AS-ALCHIMIE
admin-c:        AR15210-RIPE
tech-c:         AR15210-RIPE
status:         ASSIGNED
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         MNT-CELLFISH
created:        2010-12-02T08:34:43Z
last-modified:  2019-09-06T09:45:07Z
source:         RIPE

organisation:   ORG-CFS4-RIPE
org-name:       Alchimie SAS
country:        FR
org-type:       LIR
address:        33, rue la Fayette
address:        75009
address:        Paris
address:        FRANCE
phone:          +33000000000
abuse-c:        AR15210-RIPE
admin-c:        AR15210-RIPE
mnt-ref:        RIPE-NCC-HM-MNT
mnt-ref:        MNT-CELLFISH
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         MNT-CELLFISH
created:        2010-10-22T12:00:57Z
last-modified:  2024-03-01T09:27:33Z
source:         RIPE # Filtered

role:           NOC Cellfish / Alchimie
nic-hdl:        AR15210-RIPE
org:            ORG-CFS4-RIPE
abuse-mailbox:  noc@alchimie.com
mnt-by:         MNT-CELLFISH
address:        Alchimie
address:        33, rue la Fayette
address:        75009 PARIS
address:        FR
admin-c:        BC3500-RIPE
created:        2013-12-18T14:31:20Z
last-modified:  2024-01-16T13:11:29Z
source:         RIPE # Filtered

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