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Using server whois.apnic.net.
Query string: "-V Md5.1 1.2.3.50"

% [whois.apnic.net]
% Whois data copyright terms http://www.apnic.net/db/dbcopyright.html

% Information related to '1.2.3.0 - 1.2.3.255'

inetnum: 1.2.3.0 - 1.2.3.255
netname: Debogon-prefix
descr: APNIC Debogon Project
descr: APNIC Pty Ltd
country: AU
admin-c: AR302-AP
tech-c: AR302-AP
mnt-by: APNIC-HM
mnt-routes: MAINT-AU-APNIC-GM85-AP
mnt-irt: IRT-APNICRANDNET-AU
status: ASSIGNED PORTABLE
changed: hm-changed@apnic.net 20110922
source: APNIC

irt: IRT-APNICRANDNET-AU
address: PO Box 3646
address: South Brisbane, QLD 4101
address: Australia
e-mail: abuse@apnic.net
abuse-mailbox: abuse@apnic.net
admin-c: AR302-AP
tech-c: AR302-AP
auth: # Filtered
mnt-by: MAINT-AU-APNIC-GM85-AP
changed: hm-changed@apnic.net 20110922
source: APNIC

role: APNIC RESEARCH
address: PO Box 3646
address: South Brisbane, QLD 4101
address: Australia
country: AU
phone: +61-7-3858-3188
fax-no: +61-7-3858-3199
e-mail: research@apnic.net
remarks: ++++++++++++++++++
remarks: + Address blocks listed with this contact
remarks: + are withheld from general use and are
remarks: + only routed briefly for passive testing.
remarks: +
remarks: + If you are receiving unwanted traffic
remarks: + it is almost certainly spoofed source
remarks: + or hijacked address usage.
remarks: +
remarks: + Wikipedia: IP address spoofing
remarks: + Wikipedia: Regional internet registry
remarks: +
remarks: ++++++++++++++++++
nic-hdl: AR302-AP
tech-c: AH256-AP
admin-c: AH256-AP
mnt-by: MAINT-APNIC-AP
changed: hm-changed@apnic.net 20110822
source: APNIC

% This query was served by the APNIC Whois Service version 1.69.1-APNICv1r0 (WHOIS2)