Netstat Speed

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Following code works . 
My question is can I make it faster ?


def activeip(checkip):
     # if there is any line returned we set activeb to 1 indicating that
     # this ip is active during a netstat run   
     activeb=0          
     for line in os.popen("netstat -a -n | grep '%s'" % checkip) :
     s=line
     if s <>'' :
        activeb=1
     return activeb 


Thanks