% 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 '86.128.0.0 - 86.135.255.255'

% Abuse contact for '86.128.0.0 - 86.135.255.255' is 'abuse@bt.com'

inetnum:        86.128.0.0 - 86.135.255.255
remarks:        *******************************************************************
remarks:        * Report abuse via: http://bt.custhelp.com/app/contact/c/346,3024 *
remarks:        *******************************************************************
netname:        BT-CENTRAL-PLUS
descr:          IP pools
country:        GB
admin-c:        BTCP1-RIPE
tech-c:         BTCP1-RIPE
status:         ASSIGNED PA
remarks:        Report abuse via: http://bt.custhelp.com/app/contact/c/346,3024
mnt-by:         BTNET-MNT
mnt-lower:      BTNET-MNT
mnt-routes:     BTNET-MNT
created:        2005-02-23T12:47:15Z
last-modified:  2011-02-24T14:08:09Z
source:         RIPE

role:           BT CENTRAL PLUS - OPERATIONAL SUPPORT
remarks:        *******************************************************************
remarks:        * Report abuse via: http://bt.custhelp.com/app/contact/c/346,3024 *
remarks:        *******************************************************************
address:        BT
address:        Wholesale
address:        UK
abuse-mailbox:  abuse@bt.com
admin-c:        PC487-RIPE
tech-c:         SR401-RIPE
nic-hdl:        BTCP1-RIPE
mnt-by:         BTNET-MNT
created:        2004-06-08T09:02:16Z
last-modified:  2022-09-15T10:27:14Z
source:         RIPE # Filtered

% Information related to '86.128.0.0/12AS2856'

route:          86.128.0.0/12
descr:          BT Public Internet Service
origin:         AS2856
mnt-by:         BTNET-INFRA-MNT
created:        2007-07-24T14:41:50Z
last-modified:  2014-07-31T08:04:40Z
source:         RIPE # Filtered

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

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