old_contents: import socket
  
  
  def valid_hostname(hostname: str):
      """
      :param hostname: The hostname requested in the scan
      :return: Hostname if it's valid, otherwise None
      """
  
      # First, let's try to see if it's an IPv4 address
      try:
          socket.inet_aton(hostname)  # inet_aton() will throw an exception if hostname is not a valid IP address
          return None                # If we get this far, it's an IP address and therefore not a valid fqdn
      except:
          pass
  
      # And IPv6
      try:
          socket.inet_pton(socket.AF_INET6, hostname)  # same as inet_aton(), but for IPv6
          return None
      except:
          pass
  
      # Then, try to do a lookup on the hostname; this should return at least one entry and should be the first time
      # that the validator is making a network connection -- the same that requests would make.
      try:
          hostname_ips = socket.getaddrinfo(hostname, 443)
  
          if len(hostname_ips) < 1:
              return None
      except:
          return None
  
      # If we've made it this far, then everything is good to go!  Woohoo!
      return hostname
  
new_contents: import socket
  
  
  def valid_hostname(hostname: str):
      """
      :param hostname: The hostname requested in the scan
      :return: Hostname if it's valid, otherwise None
      """
  
      # Block attempts to scan things like 'localhost'
      if '.' not in hostname or 'localhost' in hostname:
          return False
  
      # First, let's try to see if it's an IPv4 address
      try:
          socket.inet_aton(hostname)  # inet_aton() will throw an exception if hostname is not a valid IP address
          return None                 # If we get this far, it's an IP address and therefore not a valid fqdn
      except:
          pass
  
      # And IPv6
      try:
          socket.inet_pton(socket.AF_INET6, hostname)  # same as inet_aton(), but for IPv6
          return None
      except:
          pass
  
      # Then, try to do a lookup on the hostname; this should return at least one entry and should be the first time
      # that the validator is making a network connection -- the same that requests would make.
      try:
          hostname_ips = socket.getaddrinfo(hostname, 443)
  
          if len(hostname_ips) < 1:
              return None
      except:
          return None
  
      # If we've made it this far, then everything is good to go!  Woohoo!
      return hostname
  
subject: Add additional invalid host detection