docs: def priv(x): 
      """
      Quick and dirty method to find an IP on a private network given a correctly
      formatted IPv4 quad.
      """
      if x.startswith(u'172.'):
          return 16 <= int(x.split(u'.')[1]) < 32
      return x.startswith((u'192.168.', u'10.', u'172.'))