% 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 '91.213.61.0 - 91.213.61.255'

% Abuse contact for '91.213.61.0 - 91.213.61.255' is 'hinrich.schreeck@kkh.de'

inetnum:        91.213.61.0 - 91.213.61.255
netname:        KKH-ALLIANZ-NET
country:        DE
org:            ORG-KA194-RIPE
admin-c:        HS6793-RIPE
tech-c:         BCC10-RIPE
status:         ASSIGNED PI
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         AS9066-MNT
mnt-by:         DE-COLT-MNT
mnt-routes:     AS9066-MNT
mnt-routes:     DE-COLT-MNT
mnt-domains:    AS9066-MNT
mnt-domains:    DE-COLT-MNT
created:        2009-07-14T07:36:23Z
last-modified:  2018-10-11T09:28:35Z
source:         RIPE
sponsoring-org: ORG-CI9-RIPE

organisation:   ORG-KA194-RIPE
org-name:       Kaufmaennische Krankenkasse - KKH
country:        DE
org-type:       OTHER
address:        Karl-Wiechert-Allee 61
address:        30625 Hannover
address:        Germany
abuse-c:        AC29325-RIPE
mnt-ref:        AS9066-MNT
mnt-by:         AS9066-MNT
mnt-by:         DE-COLT-MNT
created:        2009-06-30T10:29:25Z
last-modified:  2022-12-01T16:33:13Z
source:         RIPE # Filtered

role:           EWE-TEL-SO-HOSTMASTER
address:        EWE TEL GmbH
address:        Hinter dem Turme 12
address:        38114 Braunschweig
address:        Germany
phone:          +49 5361 2777333
fax-no:         +49 5361 2777398
abuse-mailbox:  abuse@icyteas.de
admin-c:        BCCH-RIPE
tech-c:         KF433-RIPE
tech-c:         MM6401-RIPE
tech-c:         TS34744-RIPE
nic-hdl:        BCC10-RIPE
mnt-by:         AS9066-MNT
created:        1970-01-01T00:00:00Z
last-modified:  2018-03-01T11:23:29Z
source:         RIPE # Filtered

person:         Hinrich Schreeck
address:        Kaufmaennische Krankenkasse - KKH
address:        Karl-Wiechert-Allee 61
address:        D-30625 Hannover
address:        Germany
phone:          +49 511 2802 6065
fax-no:         +49 511 2802 5699
nic-hdl:        HS6793-RIPE
mnt-by:         AS9066-MNT
mnt-by:         DE-COLT-MNT
created:        2012-11-29T10:17:19Z
last-modified:  2018-03-26T17:25:43Z
source:         RIPE # Filtered

% Information related to '91.213.61.0/24AS49639'

route:          91.213.61.0/24
descr:          Kaufmaennische Krankenkasse - KKH
origin:         AS49639
mnt-routes:     DE-COLT-MNT
created:        2009-08-04T22:28:50Z
last-modified:  2018-03-26T17:34:48Z
source:         RIPE # Filtered
mnt-by:         AS9066-MNT

% 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