In Wrath of the Lich King it is item level 258, requires level 80 and sells to vendors for 6g 50s 42c. In MoP Classic it is item level 232, requires level 80 and sells to vendors for 6g 50s 42c.
Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
How Netherwind Hood Compares
Who It Suits
Cloth is the armor type Mage, Priest and Warlock wear. With Intellect, Netherwind Hood suits Discipline, Holy and Shadow Priest; Arcane, Fire and Frost Mage; Affliction, Demonology and Destruction Warlock.
Transmog Sets
Netherwind Hood is part of the transmog set Netherwind Regalia (Mage only). The other 10 pieces:
Blizzard numbers items as they are created, so the named items next to ID 49318 (49313 to 49323) were usually added in the same batch as Netherwind Hood: the same quest line, zone, vendor or reward set.