Sayyiduna Anas (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) used to get cupped three times: twice on al-akhda'ayn (the two veins at the sides of the neck) and once on al-kahil (between the shoulders).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19533