Is my network under attack?

I have the following log from my router.

Monday June 29, 2009 09:33:59 Unrecognized attempt blocked from
212.118.142.74:25801 to x.x.x.x UDP:21218
Monday June 29, 2009 09:33:59 Unrecognized attempt blocked from
202.161.75.110:19532 to x.x.x.x UDP:21218
Monday June 29, 2009 09:34:00 Unrecognized attempt blocked from
142.165.130.226:35204 to x.x.x.x UDP:21218
Monday June 29, 2009 09:34:00 Unrecognized attempt blocked from
80.184.5.226:19250 to x.x.x.x UDP:21218
Monday June 29, 2009 09:34:02 Unrecognized attempt blocked from
212.118.142.74:25801 to x.x.x.x UDP:21218
Monday June 29, 2009 09:34:02 Unrecognized attempt blocked from
93.86.218.101:59572 to x.x.x.x UDP:21218
Monday June 29, 2009 09:34:04 Unrecognized attempt blocked from
80.184.5.226:19250 to x.x.x.x UDP:21218
Monday June 29, 2009 09:34:05 Unrecognized attempt blocked from
212.118.142.74:25801 to x.x.x.x UDP:21218
Monday June 29, 2009 09:34:06 Unrecognized attempt blocked from
82.134.233.161:60237 to x.x.x.x UDP:21218
Monday June 29, 2009 09:34:08 Unrecognized attempt blocked from
86.97.151.93:63060 to x.x.x.x UDP:21218

Anybody know why my port 21218 is so significant? What is it used for?

-- 
Regards,
Danny Ching
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