diff --git a/rog/urls.py b/rog/urls.py
index c37795d..1f5fab2 100644
--- a/rog/urls.py
+++ b/rog/urls.py
@@ -1,6 +1,6 @@
 from rest_framework import urlpatterns
 from rest_framework.routers import DefaultRouter
-from .views import LocationViewSet, Location_lineViewSet, Location_polygonViewSet, Jpn_Main_PerfViewSet, Jpn_PerfViewSet, LocationsInPerf, SubInPerf
+from .views import LocationViewSet, Location_lineViewSet, Location_polygonViewSet, Jpn_Main_PerfViewSet, Jpn_PerfViewSet, LocationsInPerf, SubInPerf, ExtentForSubPerf
 from django.urls import path, include
 
 
@@ -18,4 +18,5 @@ urlpatterns = router.urls
 urlpatterns += [
     path('inperf/', LocationsInPerf, name="location_perf"),
     path('insubperf/', SubInPerf, name="sub_perf"),
+    path('perfext/', ExtentForSubPerf, name="sub_perf_ext"),
 ]
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diff --git a/rog/views.py b/rog/views.py
index c9ec973..2442df6 100644
--- a/rog/views.py
+++ b/rog/views.py
@@ -52,4 +52,12 @@ def SubInPerf(request):
     sub = JpnAdminPerf.objects.filter(geom__within=perf_geom.geom)
     serializer = JPN_perfSerializer(sub, many=True)
     return JsonResponse(serializer.data, safe=False)
+
+
+def ExtentForSubPerf(request):
+    sub_perf_id = request.GET.get('sub_perf')
+    sub_perf = JpnAdminPerf.objects.get(id=sub_perf_id)
+    ext = sub_perf.geom.extent
+    # iata = serializers.serialize("json",ext)
+    return JsonResponse(ext, safe=False)
     
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