The man’s passport and photo were posted online through the Twitter handle, @TDecker75 on Friday night.
The passport indicated that the man’s name is Ibrahim Adeola, born May 24, 1979, in Imo State.
Adeola’s passport was issued on January 21, 2012 and its expiration date is January 20, 2017.
He is believed to have been kidnapped in Wilayat, an eastern part of Libya.
The Nigerian was reportedly abducted by the IS along with a Ghanaian, Kofi Sekyere and an Egyptian, Bekhit Ebeid.
The group, along with groups like it, are notorious for beheading hostages and making videos of them.
It was earlier reported that the West African terror group, commonly known as Boko Haram, had pledged allegiance to ISIS.
In March, the son of a former Chief Justice of Nigeria, Justice Muhammad Uwais, Ibrahim, had travelled to Syria and allegedly joined ISIS.
The junior Uwais, who is in his 40s, was said to have made the trip with his two wives and four children.
Beginning in 2014, a number of people from various countries were beheaded by the IS operating in Iraq and parts of Syria.
In January 2015, a copy of an ISIL penal code surfaced describing the penalties it enforces in areas under its control, including beheadings. Beheading videos have been frequently posted by the group to social media.