diff --git a/src/main/python/get_ip_ranges/source.py b/src/main/python/get_ip_ranges/source.py
index 993ba0b..e29824d 100644
--- a/src/main/python/get_ip_ranges/source.py
+++ b/src/main/python/get_ip_ranges/source.py
@@ -55,7 +55,9 @@ def do_get_ip_ranges(self, auth_credentials, cert):
     password = auth_credentials["privateKey"]
     hostname = self.inputs["endpoint"]["endpointProperties"]["hostName"]
     apiAppId = self.inputs["endpoint"]["endpointProperties"]["apiAppId"]
-    filterPool = self.inputs["endpoint"]["endpointProperties"]["filterPool"]
+    enableFilter = self.inputs["endpoint"]["endpointProperties"]["enableFilter"]
+    filterField = self.inputs["endpoint"]["endpointProperties"]["filterField"]
+    filterValue = self.inputs["endpoint"]["endpointProperties"]["filterValue"]
     uri = f'https://{hostname}/api/{apiAppId}/'
     auth = (username, password)
 
@@ -64,10 +66,12 @@ def do_get_ip_ranges(self, auth_credentials, cert):
 
     # Request list of subnets
     subnet_uri = f'{uri}/subnets/'
-    if filterPool == "true":
-      queryFilter = 'filter_by=isPool&filter_value=1'
+    if enableFilter == "true":
+      queryFilter = f'filter_by={filterField}&filter_value={filterValue}'
+      logging.info(f"Searching for subnets matching filter: {queryFilter}")
     else:
       queryFilter = ''
+      logging.info(f"Searching for all known subnets")
     ipRanges = []
     subnets = requests.get(f'{subnet_uri}?{queryFilter}', headers=token, verify=cert)
     subnets = subnets.json()['data']
diff --git a/src/main/resources/endpoint-schema.json b/src/main/resources/endpoint-schema.json
index 8ca5a2d..4641ede 100644
--- a/src/main/resources/endpoint-schema.json
+++ b/src/main/resources/endpoint-schema.json
@@ -25,8 +25,32 @@
                         "display":"textField"
                      },
                      {
-                        "id":"filterPool",
+                        "id":"enableFilter",
                         "display": "checkbox"
+                     },
+                     {
+                        "id":"filterField",
+                        "display":"textField",
+                        "state":{
+                           "visible":[{
+                              "equals":{
+                                 "enableFilter":true
+                              },
+                              "value":true
+                           }]
+                        }
+                     },
+                     {
+                        "id":"filterValue",
+                        "display":"textField",
+                        "state":{
+                           "visible":[{
+                              "equals":{
+                                 "enableFilter":true
+                              },
+                              "value":true
+                           }]
+                        }
                      }
                   ]
                }
@@ -71,14 +95,47 @@
             "required":true
          }
       },
-      "filterPool":{
+      "enableFilter":{
          "type":{
             "dataType":"boolean"
          },
-         "label":"Only find ranges marked as Pools",
-         "signpost":"If enabled, vRA will only retrieve subnets marked as pools in phpIPAM",
+         "label":"Subnets must match filter",
+         "signpost":"Enable to only retrieve subnets matching a designated filter. Useful for limiting the discovery scope to subnets which should be owned/managed by vRA.",
          "default":true
+      },
+      "filterField":{
+         "type":{
+            "dataType":"string"
+         },
+         "label":"Field for filter",
+         "signpost":"'isPool' to match subnets marked as IP Pools. See the <a href='https://phpipam.net/api/api_documentation/'>phpIPAM API documentation</a>.",
+         "constraints":{
+            "required":[{
+               "equals":{
+                  "enableFilter":true
+               },
+               "value":true
+            }]
+         },
+         "default":"isPool"
+      },
+      "filterValue":{
+         "type":{
+            "dataType":"string"
+         },
+         "label":"Value for filter",
+         "signpost":"'1' to match filters which are true",
+         "constraints":{
+            "required":[{
+               "equals":{
+                  "enableFilter":true
+               },
+               "value":true
+            }]
+         },
+         "default":"1"
       }
+
    },
    "options":{