pinger[] ps=new pinger[65536]; 

int w=256,h=256; 
int running=0; 

int cap=0;

void setup(){ 
  size(256,256); 
  background(0); 

  for(int a=0;a<w;a++){ 
    for(int b=0;b<h;b++){ 
      ps[a*256+b]=new pinger(a,b); 
    } 
    println("setting up... "+((a*256)/65535.0*100)+"%"); 
  } 

  frameRate(1); 
} 

int k=0; 

void mousePressed(){ 
  saveFrame(); 
} 

void draw(){ 

  for(int i=0;i<256;i++){ 
    for(int j=0;j<256;j++){  
      if(i*256+j<cap){
        float per=float(ps[i*256+j].i)/max(k,1); 
        stroke(map(per,0,0.5,0,255),map(per,.25,0.75,0,255),map(per,0.5,1.0,0,255)); 
        point(i,j); 
        //println(i+","+j);
        k=max(k,ps[i*256+j].i); 
      }
    }
  } 
  println(k+"-"+running+" "+cap+":"+(float)cap/655.35+"%"); 

  while(running<100 && cap<65535){
    running++;
    ps[cap].start(); 
    cap++;
  }
  //noSmooth(); 
  //copy(0,0,w,h,0,0,width,height); 

  //println(a+","+b); 
} 


import java.lang.Thread; 

//the auction class 
class pinger extends Thread{ 
  int i=0; 
  int a,b; 

  //initialize the pinger object 
  pinger(int _a, int _b) { 
    a=_a; 
    b=_b; 
  } 

  //pings 65535 IPs 
  void run(){ 
    try{ Thread.sleep((int)random(1000)); }catch(Exception e){} 
    for(int c=1;c<2;c++){ 
      for(int d=1;d<2;d++){ 
        i+=ping(a+"."+b+"."+c+"."+d)*256; 
        try{ Thread.sleep((int)random(10)); }catch(Exception e){} 
      } 
    } 
    running--; 
  } 

} 

int ping(String ip){ 
  String pingResult = ""; 
  String cmd = "ping -c 1 -t 1 -q "+ip; 
  //println(cmd);
  try { 
    Runtime r = Runtime.getRuntime(); 
    Process p = r.exec(cmd); 

    BufferedReader in = new BufferedReader(new 
      InputStreamReader(p.getInputStream())); 
    String inputLine; 
    while((inputLine = in.readLine())!=null){
      //println(inputLine);
      if(inputLine!=null && inputLine.indexOf(" 0.0%")>-1) return 1; 
    }
    in.close(); 
  }//try 
  catch (IOException e) { 
    try{ Thread.sleep((int)random(10)); }catch(Exception e2){} 
    return ping(ip); 
  } 
  return 0; 
}