docs: public boolean inetAddressOnNetwork(InetAddress ia) {
      int i = (_o1 << 24) |
              (_o2 << 16) |
              (_o3 << 8) |
              (_o4 << 0);
  
      byte[] barr = ia.getAddress();
      if (barr.length != 4) {
        return false;
      }
  
      int j = (((int)barr[0] & 0xff) << 24) |
              (((int)barr[1] & 0xff) << 16) |
              (((int)barr[2] & 0xff) << 8) |
              (((int)barr[3] & 0xff) << 0);
  
      // Do mask math in 64-bit to handle 32-bit wrapping cases.
      long mask1 = ((long)1 << (32 - _bits));
      long mask2 = mask1 - 1;
      long mask3 = ~mask2;
      int mask4 = (int) (mask3 & 0xffffffff);
  
      if ((i & mask4) == (j & mask4)) {
        return true;
      }
  
      return false;
    }