docs: def dshield_ip_check(ip):
      """Checks dshield for info on an IP address"""
      if not is_IPv4Address(ip):
          return None
  
      headers = {'User-Agent': useragent}
      url = 'https://isc.sans.edu/api/ip/'
      response = requests.get('{0}{1}?json'.format(url, ip), headers=headers)
      return response.json()