Quick Internet Connectivity Test: Invokes a connect on Google's public DNS server: 8.8.8.8:53/TCP with a socket timeout of 1 second.

internet.py

import socket

def internet(host="8.8.8.8", port=53, timeout=3):
  """
  Host: 8.8.8.8 (google-public-dns-a.google.com)
  OpenPort: 53/tcp
  Service: domain (DNS/TCP)
  """
  try:
    socket.setdefaulttimeout(timeout)
    socket.socket(socket.AF_INET, socket.SOCK_STREAM).connect((host, port))
    return True
  except Exception as ex:
    print ex.message
    return False

StackOverflow Answer: http://stackoverflow.com/a/33117579/1079836

Won't checking internet connection by accessing port 53 on 8.8.8.8 every 5 seconds lead possibly to getting client's IP blocked by Google (get marked as abuse)?