Praise be to Allah.
Twelve optional prayers
The twelve regular Sunnahs , concerning the virtue of which it is narrated that the one who offers them regularly will have a house built for him in Paradise, have been explained in the answer to question no. 1048 .
They are: the two Rak`ahs before Fajr, four Rak`ahs before Dhuhr and two Rak`ahs after it, two Rak`ahs after Maghrib and two Rak`ahs after `Isha.
When to Pray the Sunnah of Fajr
What you do after the Adhan for Subh and before the obligatory prayer is supererogatory and they are the two Rak`ahs of Fajr which are called the Sunnah of Fajr or the Sunnah of Subh . They are among the twelve regular Sunnahs, as mentioned above, and your doing them is part of regularly observing this regular Sunnah.
For more details, please see the following answers: 65746 , 136695 , 150006 , and 33779 .
And Allah knows best.
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