ei nettside · website, web page
Feminine (ei)
Indefinite singular
ei nettside
Definite singular
nettsida
Indefinite plural
nettsider
Definite plural
nettsidene
Feminine nouns (ei) can always be written with en as well: ei bok, boka or en bok, boken. Both are correct Bokmål.
How to guess the gender Nouns: gender and articles