diff --git a/rules.json b/rules.json.template
similarity index 98%
rename from rules.json
rename to rules.json.template
index be078ce..01d32b2 100644
--- a/rules.json
+++ b/rules.json.template
@@ -1,7 +1,7 @@
 [
     {
         "name": "searx.space",
-        "filters": ["Header:X-Forwarded-For=(2001:41d0:8:de3::1|176.31.252.227)"],
+        "filters": ["Header:X-Forwarded-For=$CHECK_SEARX_SPACE_IPS"],
         "stop": true,
         "actions": [{ "name": "log"}]
     },
diff --git a/start.sh b/start.sh
index ec974c3..75397b1 100755
--- a/start.sh
+++ b/start.sh
@@ -5,6 +5,8 @@ cd -- "$BASE_DIR"
 
 . ./util.sh
 
+create_rules_json "check.searx.space" > rules.json
+
 $DOCKERCOMPOSE -f $DOCKERCOMPOSEFILE down -v
 $DOCKERCOMPOSE -f $DOCKERCOMPOSEFILE rm -fv
 $DOCKERCOMPOSE -f $DOCKERCOMPOSEFILE up
diff --git a/util.sh b/util.sh
index 9cfd4d0..d9610e8 100644
--- a/util.sh
+++ b/util.sh
@@ -24,3 +24,9 @@ if [ ! -f "${DOCKERCOMPOSEFILE}" ]; then
     echo "${DOCKERCOMPOSEFILE} not found" 1>&2
     exit 1
 fi
+
+create_rules_json() {
+    # $1 : requests host name $1 will bypass filtron
+    IPS="($(host $1 | rev | cut -d\  -f1 | rev | tr '\n' '|' | sed 's/.$//'))"
+    sed "s/\$CHECK_SEARX_SPACE_IPS/$IPS/" rules.json.template
+}