diff --git a/cmd/cdn.go b/cmd/cdn.go
new file mode 100644
index 0000000..656e5cf
--- /dev/null
+++ b/cmd/cdn.go
@@ -0,0 +1,47 @@
+package cmd
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+
+	"github.com/zu1k/nali/internal/app"
+
+	"github.com/spf13/cobra"
+)
+
+// cdnCmd represents the cdn command
+var cdnCmd = &cobra.Command{
+	Use:   "cdn",
+	Short: "Query cdn service provider",
+	Long:  `Query cdn service provider`,
+	Run: func(cmd *cobra.Command, args []string) {
+		if update {
+			app.UpdateDB()
+		}
+
+		app.InitCDNDB()
+
+		if len(args) == 0 {
+			stdin := bufio.NewScanner(os.Stdin)
+			for stdin.Scan() {
+				line := stdin.Text()
+				if line == "quit" || line == "exit" {
+					return
+				}
+				fmt.Println(app.ReplaceCDNInString(line))
+			}
+		} else {
+			app.ParseCDNs(args)
+		}
+	},
+}
+
+var (
+	update = false
+)
+
+func init() {
+	rootCmd.AddCommand(cdnCmd)
+	cdnCmd.Flags().BoolVarP(&update, "update", "u", false, "Update CDN database")
+}
diff --git a/internal/app/cdn.go b/internal/app/cdn.go
new file mode 100644
index 0000000..0f22892
--- /dev/null
+++ b/internal/app/cdn.go
@@ -0,0 +1,93 @@
+package app
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"path/filepath"
+	"regexp"
+	"strings"
+
+	"github.com/zu1k/nali/constant"
+
+	"github.com/zu1k/nali/pkg/cdn"
+)
+
+var (
+	cdnDB    cdn.CDN
+	domainRe *regexp.Regexp
+)
+
+func init() {
+	domainRe = regexp.MustCompile(`[0-9A-Za-z]{2,}\.[0-9A-Za-z]{2,3}\.[0-9A-Za-z]{2,3}|[0-9A-Za-z]{2,}\.[0-9A-Za-z]{2,3}`)
+}
+
+func InitCDNDB() {
+	cdnDB = cdn.NewCDN(filepath.Join(constant.HomePath, "cdn.json"))
+}
+
+func ParseCDNs(str []string) {
+	for _, cname := range str {
+		name := find(cname)
+		fmt.Printf("%s [%s]\n", cname, name)
+	}
+}
+
+func find(cname string) string {
+	baseCname := parseBaseCname(cname)
+	if baseCname == "" {
+		return "无法解析"
+	}
+	cdnResult, found := cdnDB.Data[baseCname]
+	if found {
+		return cdnResult.Name
+	}
+	return "未找到"
+}
+
+func ReplaceCDNInString(str string) (result string) {
+	cnames := domainRe.FindAllString(str, -1)
+	result = str
+	for _, cname := range cnames {
+		name := find(cname)
+		if name != "未找到" && name != "无法解析" {
+			result = strings.ReplaceAll(result, cname, fmt.Sprintf("%s [%s]", cname, name))
+		}
+	}
+	return
+}
+
+func parseBaseCname(domain string) string {
+	hostParts := strings.Split(domain, ".")
+	if len(hostParts) < 2 {
+		return domain
+	}
+	baseCname := hostParts[len(hostParts)-2] + "." + hostParts[len(hostParts)-1]
+	return baseCname
+}
+
+func UpdateDB() {
+	filePath := filepath.Join(constant.HomePath, "cdn.json")
+
+	log.Println("正在下载最新 CDN数据库...")
+	tmpData, err := cdn.Download()
+	if err != nil {
+		log.Fatalln("下载失败", err.Error())
+		return
+	}
+
+	// 文件存在就删除
+	_, err = os.Stat(filePath)
+	if err == nil {
+		err = os.Remove(filePath)
+		if err != nil {
+			log.Fatalln("旧文件删除失败", err.Error())
+			os.Exit(1)
+		}
+	}
+
+	if err := ioutil.WriteFile(filePath, tmpData, 0644); err == nil {
+		log.Printf("已将最新的CDN数据库保存到本地 %s ", filePath)
+	}
+}
diff --git a/pkg/cdn/cdn.go b/pkg/cdn/cdn.go
new file mode 100644
index 0000000..8704f14
--- /dev/null
+++ b/pkg/cdn/cdn.go
@@ -0,0 +1,56 @@
+package cdn
+
+import (
+	"encoding/json"
+	"io/ioutil"
+	"log"
+	"os"
+)
+
+type CDN struct {
+	Data CDNDist
+}
+
+type CDNDist map[string]CDNResult
+
+type CDNResult struct {
+	Name string `json:"name"`
+	Link string `json:"link"`
+}
+
+func NewCDN(filePath string) CDN {
+	cdnDist := make(CDNDist)
+	cdnData := make([]byte, 0)
+
+	// 判断文件是否存在
+	_, err := os.Stat(filePath)
+	if err != nil && os.IsNotExist(err) {
+		log.Println("文件不存在，尝试从网络获取最新CDN数据库")
+		cdnData, err = Download()
+		if err != nil {
+			panic(err)
+		} else {
+			if err := ioutil.WriteFile(filePath, cdnData, 0644); err == nil {
+				log.Printf("已将最新的 CDN数据库 保存到本地: %s ", filePath)
+			}
+		}
+	} else {
+		// 打开文件句柄
+		cdnFile, err := os.OpenFile(filePath, os.O_RDONLY, 0400)
+		if err != nil {
+			panic(err)
+		}
+		defer cdnFile.Close()
+
+		cdnData, err = ioutil.ReadAll(cdnFile)
+		if err != nil {
+			panic(err)
+		}
+	}
+
+	err = json.Unmarshal(cdnData, &cdnDist)
+	if err != nil {
+		panic("cdn data parse failed!")
+	}
+	return CDN{Data: cdnDist}
+}
diff --git a/pkg/cdn/update.go b/pkg/cdn/update.go
new file mode 100644
index 0000000..619f9f9
--- /dev/null
+++ b/pkg/cdn/update.go
@@ -0,0 +1,21 @@
+package cdn
+
+import (
+	"io/ioutil"
+	"net/http"
+)
+
+func Download() (data []byte, err error) {
+	//resp, err := http.Get("https://raw.githubusercontent.com/SukkaLab/cdn/master/dist/cdn.json")
+	resp, err := http.Get("https://cdn.jsdelivr.net/gh/SukkaLab/cdn/dist/cdn.json")
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+	return body, nil
+}
diff --git a/pkg/common/struct.go b/pkg/common/struct.go
index 1669509..58849a3 100644
--- a/pkg/common/struct.go
+++ b/pkg/common/struct.go
@@ -2,8 +2,8 @@ package common
 
 import "os"
 
-// FileInfo: info of db file
-type FileInfo struct {
+// FileData: info of db file
+type FileData struct {
 	Data     []byte
 	FilePath string
 	FileBase *os.File
@@ -11,7 +11,7 @@ type FileInfo struct {
 
 // IPDB common ip database
 type IPDB struct {
-	Data     *FileInfo
+	Data     *FileData
 	Offset   uint32
 	ItemLen  uint32
 	IndexLen uint32
diff --git a/pkg/qqwry/qqwry.go b/pkg/qqwry/qqwry.go
index ae75b32..607e778 100644
--- a/pkg/qqwry/qqwry.go
+++ b/pkg/qqwry/qqwry.go
@@ -20,7 +20,7 @@ type QQwry struct {
 // NewQQwry new db from path
 func NewQQwry(filePath string) QQwry {
 	var fileData []byte
-	var fileInfo common.FileInfo
+	var fileInfo common.FileData
 
 	// 判断文件是否存在
 	_, err := os.Stat(filePath)
diff --git a/pkg/zxipv6wry/zxipv6wry.go b/pkg/zxipv6wry/zxipv6wry.go
index a68ddd6..963cac6 100644
--- a/pkg/zxipv6wry/zxipv6wry.go
+++ b/pkg/zxipv6wry/zxipv6wry.go
@@ -18,7 +18,7 @@ type ZXwry struct {
 
 func NewZXwry(filePath string) ZXwry {
 	var tmpData []byte
-	var fileInfo common.FileInfo
+	var fileInfo common.FileData
 
 	// 判断文件是否存在
 	_, err := os.Stat(filePath)