With the Sierra release a new tool also came.
This tool AssetCacheLocatorUtil located at /usr/bin/AssetCacheLocatorUtil when run will tell you if your host mac detects any caching servers on your network.
EG
17:57:38.697 AssetCacheLocatorUtil[27658:174761] --- Information for user 501 (results for other users may be different): 2016-11-08 17:57:38.697 AssetCacheLocatorUtil[27658:174761] Checking whether there might be caching server(s) available... 2016-11-08 17:57:38.698 AssetCacheLocatorUtil[27658:174761] There might be caching server(s) available. 2016-11-08 17:57:38.698 AssetCacheLocatorUtil[27658:174761] Checking for saved servers supporting personal caching... 2016-11-08 17:57:38.698 AssetCacheLocatorUtil[27658:174761] Found 0 servers 2016-11-08 17:57:38.698 AssetCacheLocatorUtil[27658:174761] Checking for saved servers supporting personal caching and import... 2016-11-08 17:57:38.699 AssetCacheLocatorUtil[27658:174761] Found 0 servers 2016-11-08 17:57:38.699 AssetCacheLocatorUtil[27658:174761] Checking for saved servers supporting shared caching... 2016-11-08 17:57:38.699 AssetCacheLocatorUtil[27658:174761] Found 1 server 2016-11-08 17:57:38.699 AssetCacheLocatorUtil[27658:174761] Found total 1 saved server 2016-11-08 17:57:38.699 AssetCacheLocatorUtil[27658:174761] 10.8.1.17:49410, valid until 2016-11-08 18:54:47; supports personal caching: no, and import: n/a, shared caching: yes 2016-11-08 17:57:38.699 AssetCacheLocatorUtil[27658:174761] Checking for refreshed servers supporting personal caching... 2016-11-08 17:57:38.923 AssetCacheLocatorUtil[27658:174761] Found 0 servers 2016-11-08 17:57:38.923 AssetCacheLocatorUtil[27658:174761] Checking for refreshed servers supporting personal caching and import... 2016-11-08 17:57:38.924 AssetCacheLocatorUtil[27658:174761] Found 0 servers 2016-11-08 17:57:38.924 AssetCacheLocatorUtil[27658:174761] Checking for refreshed servers supporting shared caching... 2016-11-08 17:57:38.924 AssetCacheLocatorUtil[27658:174761] Found 1 server 2016-11-08 17:57:38.924 AssetCacheLocatorUtil[27658:174761] Found total 1 refreshed server 2016-11-08 17:57:38.924 AssetCacheLocatorUtil[27658:174761] 10.8.1.17:49410, valid until 2016-11-08 18:57:38; supports personal caching: no, and import: n/a, shared caching: yes
The last line is important, it tells me that it found a caching server, located at 10.8.1.17 and that it’s valid. Doesn’t support import or personal caching.
If there’s no caching sever, it’ll refresh and then respond back
2016-11-08 18:00:00.061 AssetCacheLocatorUtil[28594:178936] Found 0 servers 2016-11-08 18:00:00.061 AssetCacheLocatorUtil[28594:178936] Found total 0 refreshed servers