I'm not able to discover a class B network. In this case 172.25.0.0, subnetmask 255.255.255.0
according to the thread at https://www.paessler.com/knowledgebase/en/topic/14303-automatic-search-class-b-network, dated January 13 2011, the new version of PRTG would be able to do so.
Maybe I'm missing something :)
Please your help would be appreciated.
Thanks in advance.
Pim System Administrator