diff --git a/README.md b/README.md
index 1fe5d1f..a56ef88 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@
     go get -u github.com/guessi/ssl-certs-checker
 
 ## Examples
- 
+
 install binary to your ${GOPATH}
 
     go install github.com/ssl-certs-checker
@@ -15,39 +15,39 @@ check single target host certificates infomation
 
     ${GOPATH}/bin/ssl-certs-checker --hosts "www.google.com"
 
-    +----------------+----------------+----------------+-------------------------------+-------------------------------+------------+
-    | Host           | Common Name    | DNS Names      | Not Before                    | Not After                     | Issuer     |
-    +----------------+----------------+----------------+-------------------------------+-------------------------------+------------+
-    | www.google.com | www.google.com | www.google.com | 2020-02-12 11:47:41 +0000 UTC | 2020-05-06 11:47:41 +0000 UTC | GTS CA 1O1 |
-    +----------------+----------------+----------------+-------------------------------+-------------------------------+------------+
+    +--------------------+----------------+----------------+-------------------------------+-------------------------------+------------+
+    | Host               | Common Name    | DNS Names      | Not Before                    | Not After                     | Issuer     |
+    +--------------------+----------------+----------------+-------------------------------+-------------------------------+------------+
+    | www.google.com:443 | www.google.com | www.google.com | 2020-02-12 11:47:41 +0000 UTC | 2020-05-06 11:47:41 +0000 UTC | GTS CA 1O1 |
+    +--------------------+----------------+----------------+-------------------------------+-------------------------------+------------+
 
 check multiple target hosts' certificates at once
 
     ${GOPATH}/bin/ssl-certs-checker --hosts "www.google.com,www.azure.com,www.amazon.com"
 
-    +----------------+----------------+---------------------------------------+-------------------------------+-------------------------------+-----------------------+
-    | Host           | Common Name    | DNS Names                             | Not Before                    | Not After                     | Issuer                |
-    +----------------+----------------+---------------------------------------+-------------------------------+-------------------------------+-----------------------+
-    | www.google.com | www.google.com | www.google.com                        | 2020-02-12 11:47:41 +0000 UTC | 2020-05-06 11:47:41 +0000 UTC | GTS CA 1O1            |
-    | www.azure.com  | *.azure.com    | *.azure.com                           | 2019-12-17 19:51:44 +0000 UTC | 2020-12-17 19:51:44 +0000 UTC | Microsoft IT TLS CA 4 |
-    | www.amazon.com | www.amazon.com | amazon.com                            | 2019-09-18 00:00:00 +0000 UTC | 2020-08-23 12:00:00 +0000 UTC | DigiCert Global CA G2 |
-    |                |                | amzn.com                              |                               |                               |                       |
-    |                |                | uedata.amazon.com                     |                               |                               |                       |
-    |                |                | us.amazon.com                         |                               |                               |                       |
-    |                |                | www.amazon.com                        |                               |                               |                       |
-    |                |                | www.amzn.com                          |                               |                               |                       |
-    |                |                | corporate.amazon.com                  |                               |                               |                       |
-    |                |                | buybox.amazon.com                     |                               |                               |                       |
-    |                |                | iphone.amazon.com                     |                               |                               |                       |
-    |                |                | yp.amazon.com                         |                               |                               |                       |
-    |                |                | home.amazon.com                       |                               |                               |                       |
-    |                |                | origin-www.amazon.com                 |                               |                               |                       |
-    |                |                | buckeye-retail-website.amazon.com     |                               |                               |                       |
-    |                |                | huddles.amazon.com                    |                               |                               |                       |
-    |                |                | p-nt-www-amazon-com-kalias.amazon.com |                               |                               |                       |
-    |                |                | p-yo-www-amazon-com-kalias.amazon.com |                               |                               |                       |
-    |                |                | p-y3-www-amazon-com-kalias.amazon.com |                               |                               |                       |
-    +----------------+----------------+---------------------------------------+-------------------------------+-------------------------------+-----------------------+
+    +--------------------+----------------+---------------------------------------+-------------------------------+-------------------------------+-----------------------+
+    | Host               | Common Name    | DNS Names                             | Not Before                    | Not After                     | Issuer                |
+    +--------------------+----------------+---------------------------------------+-------------------------------+-------------------------------+-----------------------+
+    | www.google.com:443 | www.google.com | www.google.com                        | 2020-02-12 11:47:41 +0000 UTC | 2020-05-06 11:47:41 +0000 UTC | GTS CA 1O1            |
+    | www.azure.com:443  | *.azure.com    | *.azure.com                           | 2019-12-17 19:51:44 +0000 UTC | 2020-12-17 19:51:44 +0000 UTC | Microsoft IT TLS CA 4 |
+    | www.amazon.com:443 | www.amazon.com | amazon.com                            | 2019-09-18 00:00:00 +0000 UTC | 2020-08-23 12:00:00 +0000 UTC | DigiCert Global CA G2 |
+    |                    |                | amzn.com                              |                               |                               |                       |
+    |                    |                | uedata.amazon.com                     |                               |                               |                       |
+    |                    |                | us.amazon.com                         |                               |                               |                       |
+    |                    |                | www.amazon.com                        |                               |                               |                       |
+    |                    |                | www.amzn.com                          |                               |                               |                       |
+    |                    |                | corporate.amazon.com                  |                               |                               |                       |
+    |                    |                | buybox.amazon.com                     |                               |                               |                       |
+    |                    |                | iphone.amazon.com                     |                               |                               |                       |
+    |                    |                | yp.amazon.com                         |                               |                               |                       |
+    |                    |                | home.amazon.com                       |                               |                               |                       |
+    |                    |                | origin-www.amazon.com                 |                               |                               |                       |
+    |                    |                | buckeye-retail-website.amazon.com     |                               |                               |                       |
+    |                    |                | huddles.amazon.com                    |                               |                               |                       |
+    |                    |                | p-nt-www-amazon-com-kalias.amazon.com |                               |                               |                       |
+    |                    |                | p-yo-www-amazon-com-kalias.amazon.com |                               |                               |                       |
+    |                    |                | p-y3-www-amazon-com-kalias.amazon.com |                               |                               |                       |
+    +--------------------+----------------+---------------------------------------+-------------------------------+-------------------------------+-----------------------+
 
 run with docker
 
diff --git a/config.go b/config.go
index 86a3667..c29e196 100644
--- a/config.go
+++ b/config.go
@@ -4,5 +4,6 @@ import "time"
 
 const (
 	dialerTimeout = 10 * time.Second
+	defaultPort   = 443
 	protocol      = "tcp"
 )
diff --git a/utils.go b/utils.go
index 6eb953d..521c059 100644
--- a/utils.go
+++ b/utils.go
@@ -3,6 +3,7 @@ package main
 import (
 	"crypto/tls"
 	"crypto/x509"
+	"fmt"
 	"net"
 	"os"
 	"strconv"
@@ -33,9 +34,10 @@ func getPeerCertificates(h string, port int) ([]*x509.Certificate, error) {
 	return conn.ConnectionState().PeerCertificates, nil
 }
 
-func getCells(t table.Writer, h string) {
-	certs, err := getPeerCertificates(h, 443)
+func getCells(t table.Writer, host string, port int) {
+	certs, err := getPeerCertificates(host, port)
 	if err != nil {
+		fmt.Printf("err: %s\n", err)
 		return // skip if target host invalid
 	}
 
@@ -43,9 +45,14 @@ func getCells(t table.Writer, h string) {
 		if c.IsCA {
 			continue
 		}
-		t.AppendRows([]table.Row{
-			{h, (*c).Subject.CommonName, strings.Join((*c).DNSNames, "\n"), (*c).NotBefore, (*c).NotAfter, (*c).Issuer.CommonName},
-		})
+		t.AppendRows([]table.Row{{
+			host + ":" + strconv.Itoa(port),
+			(*c).Subject.CommonName,
+			strings.Join((*c).DNSNames, "\n"),
+			(*c).NotBefore,
+			(*c).NotAfter,
+			(*c).Issuer.CommonName,
+		}})
 	}
 }
 
@@ -64,7 +71,18 @@ func prettyPrintCertsInfo(h string) {
 	})
 
 	for _, target := range targets {
-		getCells(t, target)
+		p := defaultPort
+		ts := strings.Split(target, ":")
+		if len(ts) == 2 {
+			tp, err := strconv.Atoi(ts[1])
+			if err != nil {
+				fmt.Printf("err: invalid port [%s], assume target port is 443\n", target)
+			} else {
+				p = tp
+			}
+		}
+
+		getCells(t, ts[0], p)
 	}
 
 	t.Style().Format.Header = text.FormatDefault