IRGC forces fired the medium-range, ground-to-ground ballistic missiles from bases in the western Iranian provinces of Kermanshah and Kurdistan, according to Iranian state media outlet Tasnim news.
Iran's Revolutionary Guard says it has launched a series of missile strikes on eastern Syria over Islamic State-claimed attacks on Tehran.
The missile strikes, which occurred on Saturday, are the first reported ground-to-ground strikes from Iran into Syria since the Arab country descended into a civil war in 2011.
Sunday's assault marked an extremely rare direct attack from the Islamic Republic amid its support for embattled Syrian president Bashar Assad. "The spilling of any pure blood will not go unanswered".
The Daesh Takfiri terrorist group claimed responsibility for the assaults.
The Guard warned ISIL militants and their "regional and global supporters" that similar retaliatory attacks would target them as well if another assault in Iran occurred.
Iran has described the attackers as being "long affiliated with the Wahhabi", an ultraconservative form of Sunni Islam practiced in Saudi Arabia.