diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..02d6e25
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+RealiTLScanner
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..ddfd2be
--- /dev/null
+++ b/README.md
@@ -0,0 +1,14 @@
+# Reality - Tls - Scanner
+
+Build
+```
+go build
+```
+
+Usage
+
+Recommend to run this tool locally. It may cause VPS to be flagged if you run scanner in the cloud.
+```
+./RealiTLScanner -addr www.microsoft.com
+./RealiTLScanner -addr 20.81.111.85
+``
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..e88a399
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module github.com/xtls/RealiTLScanner
+
+go 1.19
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..037e7c3
--- /dev/null
+++ b/main.go
@@ -0,0 +1,59 @@
+package main
+
+import (
+	"crypto/tls"
+	"flag"
+	"fmt"
+	"net"
+	"time"
+)
+
+func main() {
+	addrPtr := flag.String("addr", "127.0.0.1", "Destination to start scan")
+	portPtr := flag.String("port", "443", "Port to scan")
+	flag.Parse()
+	fmt.Println("Reality Tls Scanner running: ", *addrPtr, ":", *portPtr)
+	s := Scanner {
+		addr: *addrPtr,
+		port: *portPtr,
+		timeout: 10 * time.Second,
+		numberOfThread: 1,
+	}
+	s.Run()
+}
+
+type Scanner struct {
+	addr string
+	port string
+	timeout time.Duration
+	numberOfThread int
+}
+
+func (s Scanner) Run() {
+	conn, err := net.DialTimeout("tcp", s.addr+":"+s.port, s.timeout)
+	if err != nil {
+		fmt.Println("Dial failed: ", err)
+		return
+	}
+	line := "" + conn.RemoteAddr().String() + " \t----- "
+	conn.SetDeadline(time.Now().Add(s.timeout))
+	c := tls.Client(conn, &tls.Config {
+		InsecureSkipVerify: true,
+		NextProtos: []string{"h2", "http/1.1"},
+	})
+	err = c.Handshake()
+	if err != nil {
+		fmt.Println("", line, "TLS handshake failed: ", err)
+		return
+	}
+	defer c.Close()
+	state := c.ConnectionState()
+	fmt.Println("", line, "Found TLS v", TlsDic[state.Version], "\tALPN", state.NegotiatedProtocol, "\t", state.PeerCertificates[0].Subject)
+}
+
+var TlsDic = map[uint16]string{
+	0x0301: "1.0",
+	0x0302: "1.1",
+	0x0303: "1.2",
+	0x0304: "1.3",
+}