code: def _get_domain_text_of_authoritative_zone(self):
          
          # We are logged in, so get the domain list
          from bs4 import BeautifulSoup
          zones_response = self.session.get(self.URLS['domain_list'])
          self._log('Zone', zones_response)
          assert zones_response.status_code == 200, \
              'Could not retrieve domain list due to a network error.'
  
          html = BeautifulSoup(zones_response.content, 'html.parser')
          self._log('Zone', html)
          domain_table = html.find('table', {'id': 'cp_domain_table'})
          assert domain_table is not None, 'Could not find domain table'
  
          # (Sub)domains can either be managed in their own zones or by the
          # zones of their parent (sub)domains. Iterate over all subdomains
          # (starting with the deepest one) and see if there is an own zone
          # for it.
          domain = self.domain or ''
          domain_text = None
          subdomains = domain.split('.')
          while True:
              domain = '.'.join(subdomains)
              LOGGER.debug('Check if %s has own zone', domain)
              domain_text = domain_table.find(string=domain)
              if domain_text is not None or len(subdomains) < 3:
                  break
              subdomains.pop(0)
  
          # Update domain to equal the zone's domain. This is important if we are
          # handling a subdomain that has no zone of itself. If we do not do
          # this, self._relative_name will strip also a part of the subdomain
          # away.
          self.domain = domain
          assert domain_text is not None, \
              'The domain does not exist on Easyname.'
          return domain_text
docs: Get the authoritative name zone.