[mrtg] Target TAG Question!

[mrgenius]

hi All!
 i have little query. I have config file of mrtg which have following Target 
tag.
 *Target[old-backup]: 
1.3.6.1.4.1.1751.2.18.11.1.1.3.122004&1.3.6.1.4.1.1751.2.18.11.1.1.9.122004:public at 10.2.x.x*53
*
** 
it has *53 in the end/... I was wondering whats the purpose of it?? 
 can any one explain whats *53 will be doing??
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