% 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 '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 '81.140.0.0/17AS6871'

route:          81.140.0.0/17
descr:          BT-MBB
origin:         AS6871
mnt-by:         BTNET-INFRA-MNT
created:        2012-02-15T10:11:08Z
last-modified:  2014-07-31T08:22:18Z
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