% 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://docs.db.ripe.net/terms-conditions.html

% Note: this output has been filtered.
%       To receive output for a database update, use the "-B" flag.

% Information related to '81.8.164.0 - 81.8.164.255'

% Abuse contact for '81.8.164.0 - 81.8.164.255' is 'info@ac-net.net'

inetnum:        81.8.164.0 - 81.8.164.255
netname:        SE-AC-UMEA-ACNET-LINKNETS-NET
country:        SE
admin-c:        ACNT-RIPE
tech-c:         ACNT-RIPE
status:         ASSIGNED PA
mnt-by:         ACNT-MNT
created:        2002-08-23T08:29:01Z
last-modified:  2023-11-28T08:51:56Z
source:         RIPE

role:           AC-Net Network
address:        AC-Net Externservice AB
address:        Kaserngata 2
address:        SE-903 47 Umea
address:        Sweden
abuse-mailbox:  info@ac-net.net
admin-c:        DALI5-RIPE
tech-c:         FRKA2-RIPE
mnt-by:         ACNT-MNT
nic-hdl:        ACNT-RIPE
created:        2002-08-19T12:21:07Z
last-modified:  2023-10-20T14:57:59Z
source:         RIPE # Filtered

% Information related to '81.8.128.0/17AS25176'

route:          81.8.128.0/17
descr:          AC-Net
origin:         AS25176
mnt-by:         ACNT-MNT
mnt-routes:     ACNT-MNT
mnt-routes:     mnt-se-84grams-1 { 81.8.150.0/24, 81.8.151.0/24, 81.8.152.0/24, 81.8.153.0/24, 81.8.154.0/24, 81.8.155.0/24, 81.8.212.0/24, 81.8.245.0/24 }
created:        2004-04-21T09:45:24Z
last-modified:  2025-02-24T09:48:53Z
source:         RIPE

% This query was served by the RIPE Database Query Service version 1.116 (ABERDEEN)