It is the N. lowii from Gunung Mulu. It is not a big plant, only about 13.9 inches across. It is just under 6 years old. I grow it in 7 1/2" pot just like this one here
Here is a photo of the last pitcher it put out before this one.
This photo was taken 10-13-05
Then it threw out two leafs that never pitchered, so the shape changed quite fast.