Question: who assigns the first six digits of the mac address
[{'answer': 'the manufacturer', 'provenance': [{'wikipedia_id': '20668', 'title': 'MAC address', 'start_paragraph_id': 4, 'start_character': 41, 'end_paragraph_id': 4, 'end_character': 57, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]