% 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 '81.140.0.0 - 81.140.127.255'

% Abuse contact for '81.140.0.0 - 81.140.127.255' is 'abuse@bt.com'

inetnum:        81.140.0.0 - 81.140.127.255
netname:        BT-MBB
descr:          BT-MBB
country:        GB
admin-c:        MBB11-RIPE
tech-c:         MBB11-RIPE
status:         ASSIGNED PA
remarks:        Please send abuse notification to abuse@plus.net
mnt-by:         BTNET-MNT
mnt-lower:      BTNET-MNT
mnt-routes:     BTNET-MNT
mnt-routes:     MAINT-AS6871
created:        2004-05-07T09:13:50Z
last-modified:  2012-01-17T11:42:12Z
source:         RIPE

role:           MANAGED BROADBAND OPERATIONAL SUPPORT
address:        BT
address:        Wholesale Markets
address:        UK
admin-c:        DS3916-RIPE
tech-c:         DS3916-RIPE
nic-hdl:        MBB11-RIPE
mnt-by:         BTNET-MNT
created:        2004-03-11T10:24:36Z
last-modified:  2018-02-12T11:55:16Z
source:         RIPE # Filtered

% Information related to '81.128.0.0/12AS2856'

route:          81.128.0.0/12
descr:          BT Public Internet Service
origin:         AS2856
mnt-by:         BTNET-INFRA-MNT
created:        2005-06-16T14:11:53Z
last-modified:  2014-07-31T07:47:16Z
source:         RIPE # Filtered

% This query was served by the RIPE Database Query Service version 1.120 (DEXTER)