def get_public_ip_address(ip_address)
      params = {
          'command' => 'listPublicIpAddresses',
          'ipaddress' => ip_address
      }
      json = send_request(params)
      return nil unless json['publicipaddress']
      json['publicipaddress'].first
    end
def get_public_ip_address(ip_address)
      params = {
          'command' => 'listPublicIpAddresses',
          'ipaddress' => ip_address
      }
      json = send_request(params)
      return nil unless json['publicipaddress']
      json['publicipaddress'].first
    end
Finds the public ip address for a given ip address string.