Trying to find LFR ID's

[spanky0312]

Anyone can tell me how or where I can find LFR ID's.

For example:
Hellfire ID's is 982, 9832, 9843, 985 and 986.
Antorus ID's is 1610, 1611, 1612, 1613.

But I have no idea where to get this.
Reason I need is to update an addon (fan update) which is not developed anymore.


Thanks in advance!