[FeF6]4- is which type of complex?

In [FeF₆]^4- ion

x + 6(-1) = -4

x - 6 = -4

x = -4 + 6 = 2

Fe²⁺: [Ar]3d⁶

As F^- is a weaker field ligand. So, it will not involve 3d orbitals by pairing the electrons, but it will use 4d-orbitals of Fe²⁺ ion making it a outer orbital complex.