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Well its more like Spawner Finder, as it just looks for spawner blocks nearby.
Simply just run /locate_spawner, with the optional arguments of list and size
This mod is only needed on the server, however is able to be used on the client for singleplayer worlds.
Creates an AABB (Axis-Aligned Bounding Box) 1-64 (default 32) blocks away from the player
Searches through all blocks within that AABB for any that are a spawner block
Prints the closest one, plus an optional argument for a list to be shown to the chat of the player who ran it.
It requires the same permissions as the /locate command, which is OP level 2.
For singleplayer it does still need cheats enabled!

A server side command to locate the nearest spawners to a player!