diff --git a/ipgeo/ipdb.go b/ipgeo/ipdb.go
new file mode 100644
index 0000000..cd57b6a
--- /dev/null
+++ b/ipgeo/ipdb.go
@@ -0,0 +1,50 @@
+package ipgeo
+
+import (
+	"flag"
+	"github.com/ipipdotnet/ipdb-go"
+	"log"
+)
+
+var (
+	requiredFields = []string{
+		"country_name",
+		"region_name",
+		"city_name",
+		"isp_domain",
+		"country_code",
+		"continent_code",
+	}
+	ipipdb = flag.String("ipdb-database", "ipip.db", "path to ipip database")
+	db     *ipdb.City
+)
+
+func Init() {
+	var err error
+	db, err = ipdb.NewCity(*ipipdb)
+	if err != nil {
+		log.Fatalln("Unable to open ipdb:", err.Error())
+	}
+	if !db.IsIPv4() {
+		log.Fatalln("This IPIP.net database has no IPv4 information!")
+	}
+	{
+		fields := db.Fields()
+		for _, requiredField := range requiredFields {
+			ok := false
+			for _, field := range fields {
+				if field == requiredField {
+					ok = true
+					break
+				}
+			}
+			if !ok {
+				log.Fatalln("This IPIP.net database has no required field", requiredField)
+			}
+		}
+	}
+}
+
+func Get() *ipdb.City {
+	return db
+}
diff --git a/main.go b/main.go
index d2462be..b85afdd 100644
--- a/main.go
+++ b/main.go
@@ -4,27 +4,17 @@ import (
 	"encoding/json"
 	"flag"
 	"fmt"
-	"log"
 	"net"
 	"net/http"
 	_ "net/http/pprof"
 	"strconv"
 	"strings"
 
+	"git.eve.moe/jackyyf/navigator/ipgeo"
+	"git.eve.moe/jackyyf/navigator/mapping"
 	"github.com/ipipdotnet/ipdb-go"
 )
 
-var (
-	requiredFields = []string{
-		"country_name",
-		"region_name",
-		"city_name",
-		"isp_domain",
-		"country_code",
-		"continent_code",
-	}
-)
-
 const (
 	errIPv4Only = "Navigator works for IPv4 only :)"
 )
@@ -68,32 +58,8 @@ func buildLocation(info *ipdb.CityInfo) string {
 }
 
 func main() {
-	ipipdb := flag.String("ipdb-database", "ipip.db", "path to ipip database")
 	flag.Parse()
 
-	db, err := ipdb.NewCity(*ipipdb)
-	if err != nil {
-		log.Fatalln("Unable to open ipdb:", err.Error())
-	}
-	if !db.IsIPv4() {
-		log.Fatalln("This IPIP.net database has no IPv4 information!")
-	}
-	{
-		fields := db.Fields()
-		for _, requiredField := range requiredFields {
-			ok := false
-			for _, field := range fields {
-				if field == requiredField {
-					ok = true
-					break
-				}
-			}
-			if !ok {
-				log.Fatalln("This IPIP.net database has no required field", requiredField)
-			}
-		}
-	}
-
 	http.HandleFunc("/healthz", func(resp http.ResponseWriter, req *http.Request) {
 		resp.WriteHeader(200)
 		resp.Write([]byte("ok"))
@@ -109,6 +75,7 @@ func main() {
 			responseWithError(resp, http.StatusPreconditionFailed, errIPv4Only)
 			return
 		}
+		db := ipgeo.Get()
 
 		info_cn, err := db.FindInfo(host, "CN")
 		if err != nil {
@@ -122,20 +89,24 @@ func main() {
 		}
 		resp.Header().Set("Content-Type", "text/plain")
 		resp.WriteHeader(http.StatusOK)
+		server := mapping.Get(host)
 		fmt.Fprintln(resp, "您的IP:", host)
 		fmt.Fprintln(resp, "数据库中IP所属位置:", buildLocation(info_cn))
 		if info_cn.IspDomain != "" {
 			fmt.Fprintln(resp, "数据库中IP所属运营商:", info_cn.IspDomain)
 		}
-		// TODO(jackyyf): add mapping info here
+		fmt.Fprintln(resp, "您被分配的CDN节点为:", server)
+		fmt.Fprintln(resp)
+		fmt.Fprintln(resp, strings.Repeat("=", 72))
 
 		fmt.Fprintln(resp, "Your IP:", host)
 		fmt.Fprintln(resp, "Location for your IP according our database:", buildLocation(info_en))
 		if info_en.IspDomain != "" {
 			fmt.Fprintln(resp, "ISP for your IP according our database:", info_en.IspDomain)
 		}
-		// TODO(jackyyf): add mapping info here
-
+		fmt.Fprintln(resp, "Allocated CDN node for you:", server)
+		fmt.Fprintln(resp)
 	})
+	ipgeo.Init()
 	http.ListenAndServe("0.0.0.0:8086", nil)
 }
diff --git a/mapping/map.go b/mapping/map.go
new file mode 100644
index 0000000..6ae9f4e
--- /dev/null
+++ b/mapping/map.go
@@ -0,0 +1,31 @@
+package mapping
+
+import (
+	"git.eve.moe/jackyyf/navigator/ipgeo"
+)
+
+const (
+	// Server IDs
+	WHOLESALE_INTERNET_10GE = "xe-mci1-us"
+	HETZNER_FSN_1GE         = "ge-fsn1-de"
+	HETZNER_HEL_1GE         = "ge-hel1-fi"
+	default_server          = WHOLESALE_INTERNET_10GE
+
+	// Served domain suffix
+	CHINA_MAINLAND_SUFFIX = ".eveedge.link"
+	GLOBAL_SUFFIX         = ".edge.eve.network"
+	default_suffix        = GLOBAL_SUFFIX
+)
+
+// Get returns the edge node that should be used for client.
+func Get(ip string) string {
+	db := ipgeo.Get()
+	info_en, err := db.FindInfo(ip, "EN")
+	if err != nil {
+		return default_server + default_suffix
+	}
+	if info_en.CountryCode == "CN" {
+		return default_server + CHINA_MAINLAND_SUFFIX
+	}
+	return default_server + GLOBAL_SUFFIX
+}