Don't know if you got anywhere with this I just noticed it so just in case you're still interested....

That IP block belongs to APNIC who are responsible for domain allocation/registration in the Asia Pacific Region.

APNIC have that specific IP registered to an Australian ISP called Telstra Internet.

Telstra have an address for spam/security - "All reports regarding SPAM or security breaches remarks: should be addressed to [email protected]" so they might be able to help! Otherwise you could always give them a call their number is below.

% [whois.apnic.net node-1]

inetnum: 121.208.0.0 - 121.223.255.255
netname: TELSTRAINTERNET45-AU
descr: Telstra Internet
descr: Locked Bag 5744
descr: Canberra
descr: ACT 2601
country: AU
phone: +61 3 9815 5923
e-mail: [email protected]
nic-hdl: TIAR-AP
remarks: Telstra Internet Address Registry Role Object
mnt-by: MAINT-AU-TIAR-AP
changed: [email protected] 19951128
changed: [email protected] 20010523
changed: [email protected] 20020115
changed: [email protected] 20020813
changed: [email protected] 20050310
source: APNIC

Oh and good luck at the WSOP Chardrian =)