% APNIC found the following authoritative answer from: whois.ripe.net

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% The objects are in RPSL format.
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% Note: this output has been filtered.
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% Information related to '81.145.235.8 - 81.145.235.15'

% Abuse contact for '81.145.235.8 - 81.145.235.15' is 'abuse@bt.com'

inetnum:        81.145.235.8 - 81.145.235.15
netname:        NORTHOLT
descr:          FTIP003343319 Northolt
country:        GB
admin-c:        PC12911-RIPE
tech-c:         PC12911-RIPE
status:         ASSIGNED PA
mnt-by:         BTNET-MNT
mnt-lower:      BTNET-MNT
mnt-routes:     BTNET-MNT
remarks:        Please send abuse notification to abuse@bt.net
remarks:        Please send delisting issues to ip.address.management.account@bt.com
remarks:        ip.address.management.account@bt.com
remarks:        This range is statically assigned
created:        2014-03-28T09:06:50Z
last-modified:  2014-03-28T09:06:50Z
source:         RIPE

person:         Peter Compton
address:        West End Road
address:        Ruislip Road
address:        Middlesex
address:        HA4 6NG
address:        GB
phone:          +44 020 8833 8598
nic-hdl:        PC12911-RIPE
mnt-by:         BTNET-MNT
remarks:        Please send abuse notification to abuse@bt.net
created:        2014-03-28T09:06:50Z
last-modified:  2014-03-28T09:06:50Z
source:         RIPE # Filtered

% 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 1.120 (BUSA)