There are at least 7 different groups named Inferi. Prominently, we find two on last fm: an American melodic death metal band and a one-man black metal project from Finland.

1) A 4-piece melodic death metal band from Nashville, Tennessee USA. Members from the band Death Looks Promising, formed Inferi in 2005. They have two self-released albums: Divinity In War (2007) and The End Of An Era (2009), a demo released in 2011, and their label debut album The Path Of Apotheosis was released in 2014 on The Artisan Era. They are active.
Official facebook: http://www.facebook.com/Inferimetal
Official myspace: http://www.myspace.com/inferimetal
Lineup:
Malcolm Pugh - Guitars, Backing vocals
Mike Low - Rhythm Guitar
Nevin O'Hearn - Bass, Backing vocals
Jack Blackburn - Drums
Josh Harrell - Vocals
Ex-members:
Eric W. Brown - Drums (2006-2009)
Matt Brown - Bass, Backing vocals (2010)
Chris Brocius - Guitar, Backing vocals (unlisted dates)

2) A one man black metal band started in 2002 by Fyrdkal from Laitila, Finland. He has released two demos, Slow Decay (2003), Rise Of The Deceased (2004), a full length debut album Shores Of Sorrow (2006) on Northern Heritage Records and a compilation Inferi released by Last Rites in 2011 consisting of the first two demos and a third unreleased demo from 2005. Main lyrical concepts include desolation, depression and misanthropy. Fyrdkal is also involved with Kadotus.
Official myspace: https://myspace.com/inferi666bm

3) Dutch Black Metal band from Schiedam, formed in 1992. Changed name to Domini Inferi. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.