diff --git a/validator/validator.go b/validator/validator.go
index 757d152..bef71db 100644
--- a/validator/validator.go
+++ b/validator/validator.go
@@ -23,7 +23,7 @@ var (
 	numberRegexMatcher     *regexp.Regexp = regexp.MustCompile(`\d`)
 	intStrMatcher          *regexp.Regexp = regexp.MustCompile(`^[\+-]?\d+$`)
 	urlMatcher             *regexp.Regexp = regexp.MustCompile(`^((ftp|http|https?):\/\/)?(\S+(:\S*)?@)?((([1-9]\d?|1\d\d|2[01]\d|22[0-3])(\.(1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.([0-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(([a-zA-Z0-9]+([-\.][a-zA-Z0-9]+)*)|((www\.)?))?(([a-z\x{00a1}-\x{ffff}0-9]+-?-?)*[a-z\x{00a1}-\x{ffff}0-9]+)(?:\.([a-z\x{00a1}-\x{ffff}]{2,}))?))(:(\d{1,5}))?((\/|\?|#)[^\s]*)?$`)
-	dnsMatcher             *regexp.Regexp = regexp.MustCompile(`^[a-zA-Z]([a-zA-Z0-9\-]+[\.]?)*[a-zA-Z0-9]$`)
+	dnsMatcher             *regexp.Regexp = regexp.MustCompile(`^(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,}$`)
 	emailMatcher           *regexp.Regexp = regexp.MustCompile(`\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*`)
 	chineseMobileMatcher   *regexp.Regexp = regexp.MustCompile(`^1(?:3\d|4[4-9]|5[0-35-9]|6[67]|7[013-8]|8\d|9\d)\d{8}$`)
 	chineseIdMatcher       *regexp.Regexp = regexp.MustCompile(`^(\d{17})([0-9]|X|x)$`)
diff --git a/validator/validator_test.go b/validator/validator_test.go
index abe0454..1dca20f 100644
--- a/validator/validator_test.go
+++ b/validator/validator_test.go
@@ -271,7 +271,11 @@ func TestIsDns(t *testing.T) {
 	assert := internal.NewAssert(t, "TestIsDns")
 
 	assert.Equal(true, IsDns("abc.com"))
-	assert.Equal(false, IsDns("a.b.com"))
+	assert.Equal(true, IsDns("123.cn"))
+	assert.Equal(true, IsDns("a.b.com"))
+
+	assert.Equal(false, IsDns("a.b.c"))
+	assert.Equal(false, IsDns("a@b.com"))
 	assert.Equal(false, IsDns("http://abc.com"))
 }