diff --git a/codec.go b/codec.go
index 554ed4e..2068b84 100644
--- a/codec.go
+++ b/codec.go
@@ -276,6 +276,12 @@ func addressBytesToString(p Protocol, b []byte) (string, error) {
 			return "", err
 		}
 		return m.B58String(), nil
+
+	case P_ONION:
+		addr := strings.ToLower(base32.StdEncoding.EncodeToString(b[0:10]))
+		port := binary.BigEndian.Uint16(b[10:12])
+		return addr + ":"+ strconv.Itoa(int(port)), nil
+
 	default:
 		return "", fmt.Errorf("unknown protocol")
 	}
diff --git a/multiaddr_test.go b/multiaddr_test.go
index 6c7d772..3d5a835 100644
--- a/multiaddr_test.go
+++ b/multiaddr_test.go
@@ -166,7 +166,7 @@ func TestBytesToString(t *testing.T) {
 
 		s2, err := bytesToString(b)
 		if err != nil {
-			t.Error("failed to convert", b)
+			t.Error("failed to convert", b, err)
 		}
 
 		if s1 != s2 {
@@ -177,6 +177,7 @@ func TestBytesToString(t *testing.T) {
 	testString("/ip4/127.0.0.1/udp/1234", "047f0000011104d2")
 	testString("/ip4/127.0.0.1/tcp/4321", "047f0000010610e1")
 	testString("/ip4/127.0.0.1/udp/1234/ip4/127.0.0.1/tcp/4321", "047f0000011104d2047f0000010610e1")
+	testString("/onion/aaimaq4ygg2iegci:80", "bc030010c0439831b48218480050")
 }
 
 func TestBytesSplitAndJoin(t *testing.T) {
diff --git a/protocols.csv b/protocols.csv
index fa27ba3..4072980 100644
--- a/protocols.csv
+++ b/protocols.csv
@@ -10,4 +10,4 @@ code	size	name
 421	V	ipfs
 480	0	http
 443	0	https
-444	10	onion
\ No newline at end of file
+444	96	onion
\ No newline at end of file
diff --git a/protocols.go b/protocols.go
index 7454590..3fe0e58 100644
--- a/protocols.go
+++ b/protocols.go
@@ -47,7 +47,7 @@ var Protocols = []Protocol{
 	Protocol{P_IP6, 128, "ip6", CodeToVarint(P_IP6)},
 	// these require varint:
 	Protocol{P_SCTP, 16, "sctp", CodeToVarint(P_SCTP)},
-	Protocol{P_ONION, 80, "onion", CodeToVarint(P_ONION)},
+	Protocol{P_ONION, 96, "onion", CodeToVarint(P_ONION)},
 	Protocol{P_UTP, 0, "utp", CodeToVarint(P_UTP)},
 	Protocol{P_UDT, 0, "udt", CodeToVarint(P_UDT)},
 	Protocol{P_HTTP, 0, "http", CodeToVarint(P_HTTP)},