WoW Head Item ID’s are found in URL address of the item you’re currently looking at on wowhead. Seach wowhead.com for Nithramus, the all-seer and look at the address bar, notice the “item=124635” in the URL address. So the Item ID for Nithramus, the All-Seer is 124635.
Method 2 –
Pasting the entire address found in URL bar on your browser, when viewing an item on wowhead.com.