% 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 '81.144.191.224 - 81.144.191.255'

% Abuse contact for '81.144.191.224 - 81.144.191.255' is 'abuse@bt.com'

inetnum:        81.144.191.224 - 81.144.191.255
netname:        VIVISTA
descr:          FTIP002870601 Sungard Vivista Ltd
country:        GB
admin-c:        CT1783-RIPE
tech-c:         CT1783-RIPE
status:         ASSIGNED PA
mnt-by:         BTNET-MNT
mnt-lower:      BTNET-MNT
mnt-routes:     BTNET-MNT
remarks:        Assigned 20060619
remarks:        Please send abuse notification to abuse@bt.net
created:        2006-06-19T13:01:25Z
last-modified:  2006-06-19T13:01:25Z
source:         RIPE

person:         Colin Tozer
address:        Methuen Park
address:        Bath Road
address:        Chippenham
address:        SN14 0TW
address:        GB
phone:          +44 1249 665 544
nic-hdl:        CT1783-RIPE
remarks:        Please send abuse notification to abuse@bt.net
created:        2006-06-19T13:01:24Z
last-modified:  2020-06-04T11:08:22Z
source:         RIPE # Filtered
mnt-by:         BTNET-MNT

% Information related to '81.128.0.0/11AS2856'

route:          81.128.0.0/11
descr:          BT Public Internet Service
origin:         AS2856
mnt-by:         BTNET-INFRA-MNT
created:        2002-10-22T13:45:17Z
last-modified:  2014-07-31T07:51:30Z
source:         RIPE # Filtered

% This query was served by the RIPE Database Query Service version 1.111 (BUSA)

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