Hanafi
The sources give no view for it here.
وقت ركعتي الفجر
ما وقت ركعتي الفجر؟
Each school’s answer
Hanafi
Not stated in the sources
Maliki
Not stated in the sources
Shafi'i
Not stated in the sources
Hanbali
Not stated in the sources
The texts
٣٠٧ - مَسْأَلَةٌ: وَوَقْتُ رَكْعَتَيْ الْفَجْرِ مِنْ حِينِ طُلُوعِ الْفَجْرِ الثَّانِي إلَى أَنْ تُقَامَ صَلَاةُ الصُّبْحِ - هَذَا مَا لَا خِلَافَ فِيهِ مِنْ أَحَدٍ مِنْ الْأُمَّةِ. [مَسْأَلَةٌ سَمِعَ إقَامَةَ صَلَاةِ الصُّبْحِ]
From the schools’ own books
Maliki
The sources give no view for it here.
Shafi'i
The sources give no view for it here.
Hanbali
The sources give no view for it here.
What bears this mark is in our words, our standard wording; the books’ texts stay as they are.