Andy Coulson will have to wear an electronic tag until he has served half of his full sentence as a condition of his early release, it is understood.
The disgraced former Number 10 spin doctor has left Hollesley Bay open prison after 20 weeks of his 18-month sentence and will wear the tag for 130 days.
The ex-News of the World editor was previously held at HMP Belmarsh in south east London before switching jails in September.
The Ministry of Justice declined to comment on Coulson's arrangement but said inmates can be released for home detention before they have served half of their term.
Prisoners can be considered for HDC if they are serving a sentence of more than three months and less than four years and have served a quarter of their sentence.