diff --git a/component/trie/ipcidr_trie.go b/component/trie/ipcidr_trie.go
index a2ccfa16..ee8659be 100644
--- a/component/trie/ipcidr_trie.go
+++ b/component/trie/ipcidr_trie.go
@@ -185,6 +185,10 @@ func addIpv6Cidr(trie *IpCidrTrie, ip net.IP, groupSize int) {
 	}
 
 	for i := 2; i < groupSize; i += 2 {
+		if ip[i] == 0 && ip[i+1] == 0 {
+			node.Mark = true
+		}
+
 		if node.Mark {
 			return
 		}
diff --git a/component/trie/trie_test.go b/component/trie/trie_test.go
index e1b20103..a589b7ca 100644
--- a/component/trie/trie_test.go
+++ b/component/trie/trie_test.go
@@ -74,6 +74,14 @@ func TestIpv6AddFail(t *testing.T) {
 	assert.IsType(t, new(net.ParseError), err)
 }
 
+func TestIpv6SearchSub(t *testing.T) {
+	trie := NewIpCidrTrie()
+	assert.NoError(t, trie.AddIpCidrForString("240e::/18"))
+
+	assert.Equal(t, true, trie.IsContainForString("240e:964:ea02:100:1800::71"))
+
+}
+
 func TestIpv6Search(t *testing.T) {
 	trie := NewIpCidrTrie()