ZoneLevel now supports a lookup of zone level ranges using the /zinfo <zone> command.
Below is a list of abbreviations which can be used for each zone in addition to the zone's full name.
Note that all zone names are case insensitive.

Zone				Abbreviation <notes>
-------------------	----------------
Alterac Mountains	    	alterac
Arathi Basin		ab
Arathi Highlands		arathi
Alterac Valley		av
Burning Steppes		bs
Blackfathom Deeps		bfd
Blasted Lands		bl
Blackrock Mountain	brm
Blackrock Depths		brd
Blackrock Spire		brs
The Barrens			barrens
Blackwing Lair		bwl
Booty Bay			bb
Caverns of Time		cot <not yet accessible ingame>
Darnassus			darn
The Deadmines		deadmines
Dire Maul			dm
Dustwallow Marsh		dustwallow
				dwm
Eastern Plaguelands	epl
Elwynn Forest		elwynn
Un'Goro Crater		ungoro crater
				ungoro
Gnomeregan			gnomeregon
				gnomer
Gadgetzan			gadget
Hillsbrad Foothills	hillsbrad
The Hinterlands		hinterlands
Thousand Needles		1kn <the first character here is the number 1>
Molten Core			mc
Maraudon			md
				maur
Onyxia's Lair		onyxia
				onyx
Ragefire Chasm		rfc
Razorfen Downs		rfd
Razorfen Kraul		rfk
Redridge Mountains	redridge mts
				redridge
Shadowfang Keep		sfk
Scholomance			scholo
Swamp of Sorrows		sos
The Stockade		stockade
Stonetalon Mountains	sm
				stonetalon mts
				stonetalon
Stranglethorn Vale	stv
Silverpine Forest		silverpine
Thunder Bluff		tb
Sunken Temple ( of Atal'Hakkar)
				st
Wailing Caverns		wc
Warsong Gulch		wsg
Western Plaguelands	wpl
Zul'Farrak			zf
Zul'Gurub			zg