Are there official names sub parts of a full url?

I would like to clear up some terminology related to the name of different parts of a web address. I'm pretty sure about these

+-------------------------+-----------+
|         Example         |   Name    |
+-------------------------+-----------+
| foo.com                 | domain    |
| www                     | subdomain |
| http://                 | protocol  |
| 8000                    | port      |
| http://www.foo.com:8000 | url       |
+-------------------------+-----------+

However I do not know if these have official names:

+---------------------+--------------------+------+
|     Description     |      Example       | Name |
+---------------------+--------------------+------+
| no protocol or port | www.foo.com        | ?    |
| no port             | http://www.foo.com | ?    |
| no protocol         | www.foo.com:443    | ?    |
| domain no extension | foo                | ?    |
+---------------------+--------------------+------+