% APNIC found the following authoritative answer from: whois.ripe.net

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% Information related to '212.183.0.0 - 212.183.127.255'

% Abuse contact for '212.183.0.0 - 212.183.127.255' is 'abuse@a1.at'

inetnum:        212.183.0.0 - 212.183.127.255
netname:        AT-TELEKOM-990525
descr:          A1 Telekom Austria AG
descr:          Static IP Pool
country:        AT
org:            ORG-TAA1-RIPE
admin-c:        HMH25-RIPE
tech-c:         HMH25-RIPE
status:         ALLOCATED PA
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         AS8447-MNT
mnt-lower:      AS8447-MNT
mnt-domains:    AS8447-MNT
mnt-routes:     AS8447-MNT
created:        1970-01-01T00:00:00Z
last-modified:  2021-06-16T09:26:25Z
source:         RIPE # Filtered

organisation:   ORG-TAA1-RIPE
org-name:       A1 Telekom Austria AG
country:        AT
org-type:       LIR
address:        Lassallestrasse 9
address:        1020
address:        Wien
address:        AUSTRIA
phone:          +43 50 664 8 664 100
fax-no:         +43 50 664 8 664 101
descr:          ======================================================================
descr:          www.a1.net
descr:          Abuse issues abuse@A1.at
descr:          Operational issues noc@aon.at
descr:          Peering requests peering@aon.at
descr:          Looking glass https://ppp.a1.net/tools/lookingglass.sp
descr:          Other info https://as8447.peeringdb.com
descr:          ======================================================================
admin-c:        NCH12-RIPE
admin-c:        HMH25-RIPE
admin-c:        AJ2061-RIPE
admin-c:        MA3804-RIPE
abuse-c:        HMH25-RIPE
mnt-ref:        RIPE-NCC-HM-MNT
mnt-ref:        AS8447-MNT
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         AS8447-MNT
created:        2004-04-17T10:59:34Z
last-modified:  2020-12-16T12:30:48Z
source:         RIPE # Filtered

role:           Host Master Highway
address:        A1 Telekom Austria AG
address:        Arsenal Objekt 24
address:        1030 Vienna
address:        Austria
phone:          +43 50 664 8 664 100
fax-no:         +43 50 664 8 664 101
abuse-mailbox:  abuse@a1.at
remarks:        for database maintenance please contact
remarks:        < hostmaster @ aon.at >
admin-c:        MA3804-RIPE
admin-c:        AJ2061-RIPE
tech-c:         MA3804-RIPE
tech-c:         AJ2061-RIPE
nic-hdl:        HMH25-RIPE
mnt-by:         AS8447-MNT
created:        2002-05-31T10:41:49Z
last-modified:  2021-10-19T11:50:46Z
source:         RIPE # Filtered

% Information related to '212.183.0.0/17AS8447'

route:          212.183.0.0/17
descr:          A1 Telekom Austria Business Customers
origin:         AS8447
mnt-by:         AS8447-MNT
created:        2011-05-24T07:25:04Z
last-modified:  2021-04-26T14:49:09Z
source:         RIPE # Filtered

% This query was served by the RIPE Database Query Service version 1.114 (DEXTER)

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