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

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% The objects are in RPSL format.
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% Information related to '84.92.128.0 - 84.92.191.255'

% Abuse contact for '84.92.128.0 - 84.92.191.255' is 'abuse@bt.com'

inetnum:        84.92.128.0 - 84.92.191.255
netname:        PLUSNET-DIAL-ADSL
descr:          Dial-up and ADSL pool
descr:          PlusNet Technologies Ltd
country:        GB
admin-c:        PLUS1-RIPE
tech-c:         PNET2-RIPE
status:         ASSIGNED PA
mnt-by:         MAINT-AS6871
created:        2005-01-21T13:40:00Z
last-modified:  2005-01-21T13:40:00Z
source:         RIPE # Filtered

role:           Plusnet Hostmaster
address:        PlusNet Plc
address:        The Balance
address:        2 Pinfold Street
address:        Sheffield
address:        S1 2GU
address:        UK
phone:          +44 114 2200084
abuse-mailbox:  abuse@plus.net
remarks:        ------------------------------------------------
remarks:        Please do NOT e-mail abuse to the contacts given
remarks:        here, e-mail them to ABUSE@PLUS.NET instead.
remarks:        All email sent to other listed addresses will
remarks:        be deleted!
remarks:        ------------------------------------------------
remarks:        Network Status and Information Page:
remarks:        http://status.plus.net
remarks:        http://support.plus.net
remarks:        ------------------------------------------------
remarks:        Support 24*7 Phone: (UK) 0845 140 0200
remarks:        ------------------------------------------------
admin-c:        JW7886-RIPE
tech-c:         DS3916-RIPE
nic-hdl:        PNET2-RIPE
mnt-by:         MAINT-AS6871
created:        2002-05-16T12:18:00Z
last-modified:  2018-01-17T15:40:44Z
source:         RIPE # Filtered

person:         PlusNet Ripe Admin
address:        Plusnet plc.
address:        The Balance
address:        2 Pinfold Street
address:        Sheffield
address:        S1 2GU
address:        GB
phone:          +44 114 22 00084
nic-hdl:        PLUS1-RIPE
mnt-by:         MAINT-AS6871
created:        1970-01-01T00:00:00Z
last-modified:  2012-05-02T13:03:37Z
source:         RIPE # Filtered

% Information related to '84.92.0.0/15AS6871'

route:          84.92.0.0/15
descr:          PlusNet plc.
origin:         AS6871
mnt-by:         MAINT-AS6871
created:        2004-05-19T12:40:35Z
last-modified:  2005-07-29T13:07:44Z
source:         RIPE

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

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