You can't get the DisplayID's till 2.4 but I can recommend something so u can find them when Ascent supports 2.4
Change the Red to an Item ID, I chose Devastation for example.
wowhead.com/?item=30316&xml
You will see this, and the Red in this part is the DisplayID.
Code:
<wowhead>
−
<item id="30316">
<name>Devastation</name>
<level>175</level>
<quality id="5">Legendary</quality>
<class id="2">Weapons</class>
<subclass id="1">Two-Handed Axes</subclass>
<icon displayId="41560">INV_Axe_68</icon>
<inventorySlot id="17">Two-Hand</inventorySlot>
−
<htmlTooltip>
<table><tr><td><b class="q5">Devastation</b><br />Tempest Keep<br />Unique<table width="100%"><tr><td>Two-Hand</td><th>Axe</th></tr></table><table width="100%"><tr><td>496 - 744 Damage</td><th>Speed 3.90</th></tr></table>(159.0 damage per second)<br />+75 Stamina<!--e--><br />Durability 145 / 145<br />Requires Level 70</td></tr></table><table><tr><td><span class="q2">Equip: Improves critical strike rating by 50 <small>(2.26% @ L70)</small>.</span><br /><span class="q2">Equip: Increases attack power by 150.</span><br /><span class="q2">Chance on hit: Increases your movement speed by 50%, and your melee attack speed by 20% for 30 sec.</span></td></tr></table>
</htmlTooltip>
<link>http://www.wowhead.com/?item=30316</link>
</item>
</wowhead>