diff --git a/main.go b/main.go
index b85afdd..f9479b9 100644
--- a/main.go
+++ b/main.go
@@ -107,6 +107,22 @@ func main() {
 		fmt.Fprintln(resp, "Allocated CDN node for you:", server)
 		fmt.Fprintln(resp)
 	})
+
+	http.HandleFunc("/mapping", func(resp http.ResponseWriter, req *http.Request) {
+		host, _, err := net.SplitHostPort(req.RemoteAddr)
+		if err != nil {
+			responseWithError(resp, http.StatusPreconditionFailed, errIPv4Only)
+			return
+		}
+		if net.ParseIP(host).To4() == nil {
+			responseWithError(resp, http.StatusPreconditionFailed, errIPv4Only)
+			return
+		}
+		resp.Header().Set("Content-Type", "text/plain")
+		resp.WriteHeader(http.StatusOK)
+		server := mapping.Get(host)
+		fmt.Fprint(resp, server)
+	})
 	ipgeo.Init()
 	http.ListenAndServe("0.0.0.0:8086", nil)
 }