% 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 '46.253.50.0 - 46.253.55.255'

% Abuse contact for '46.253.50.0 - 46.253.55.255' is 'amuth@citynetz-halle.de'

inetnum:        46.253.50.0 - 46.253.55.255
netname:        MUTH-CABLE-NET
descr:          dynamic IP pool for cable modem customers
country:        DE
admin-c:        AM17393-RIPE
tech-c:         TL2879-RIPE
status:         ASSIGNED PA
mnt-by:         MUTH-MNT
created:        2011-01-04T13:51:39Z
last-modified:  2011-11-07T08:16:01Z
source:         RIPE

person:         Andreas Muth
address:        Unterberg 13
address:        06108 Halle/Saale
phone:          + 49 345 20 23 904
nic-hdl:        AM17393-RIPE
mnt-by:         MUTH-MNT
created:        2010-12-20T10:22:12Z
last-modified:  2010-12-20T10:22:13Z
source:         RIPE # Filtered

person:         Tilo Lemmnitz
address:        Unterberg 13
address:        06108 Halle/Saale
mnt-by:         MUTH-MNT
phone:          +49 346 05 37 561
nic-hdl:        TL2879-RIPE
created:        2010-12-20T13:50:58Z
last-modified:  2010-12-20T13:50:58Z
source:         RIPE

% Information related to '46.253.48.0/20AS197558'

route:          46.253.48.0/20
descr:          Muth allocation
origin:         AS197558
mnt-by:         MUTH-MNT
created:        2011-02-10T11:08:30Z
last-modified:  2011-02-10T11:08:30Z
source:         RIPE

% This query was served by the RIPE Database Query Service version 1.112 (ABERDEEN)

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