diff --git a/p2p/net/transport/tcp.go b/p2p/net/transport/tcp.go
index 2b64854c..018cd53b 100644
--- a/p2p/net/transport/tcp.go
+++ b/p2p/net/transport/tcp.go
@@ -8,6 +8,7 @@ import (
 
 	lgbl "github.com/ipfs/go-libp2p/loggables"
 	manet "gx/ipfs/QmQB7mNP3QE7b4zP2MQmsyJDqG5hzYE2CL8k1VyLWky2Ed/go-multiaddr-net"
+	mafmt "gx/ipfs/QmWLfU4tstw2aNcTykDm44xbSTCYJ9pUJwfhQCKGwckcHx/mafmt"
 	context "gx/ipfs/QmZy2y8t9zQH2a1b8q2ZSLKp17ATuJoCNxxyMFG5qFExpt/go-net/context"
 	reuseport "gx/ipfs/QmaaC9QMYTQHCbMq3Ebr3uMaAR2ev4AVqMmsJpgQijAZbJ/go-reuseport"
 	ma "gx/ipfs/QmcobAGsCjYt5DXoq9et9L8yR8er7o7Cu3DTvpaq12jYSz/go-multiaddr"
@@ -103,7 +104,7 @@ func manetListen(addr ma.Multiaddr) (manet.Listener, error) {
 }
 
 func (t *TcpTransport) Matches(a ma.Multiaddr) bool {
-	return IsTcpMultiaddr(a)
+	return mafmt.TCP.Matches(a)
 }
 
 type tcpDialer struct {
@@ -199,7 +200,7 @@ func (d *tcpDialer) reuseDial(raddr ma.Multiaddr) (manet.Conn, error) {
 }
 
 func (d *tcpDialer) Matches(a ma.Multiaddr) bool {
-	return IsTcpMultiaddr(a)
+	return mafmt.TCP.Matches(a)
 }
 
 type tcpListener struct {
diff --git a/p2p/net/transport/transport.go b/p2p/net/transport/transport.go
index 783f0205..833e7374 100644
--- a/p2p/net/transport/transport.go
+++ b/p2p/net/transport/transport.go
@@ -49,13 +49,3 @@ type TimeoutOpt time.Duration
 type ReuseportOpt bool
 
 var ReusePorts ReuseportOpt = true
-
-func IsTcpMultiaddr(a ma.Multiaddr) bool {
-	p := a.Protocols()
-	return len(p) == 2 && (p[0].Name == "ip4" || p[0].Name == "ip6") && p[1].Name == "tcp"
-}
-
-func IsUtpMultiaddr(a ma.Multiaddr) bool {
-	p := a.Protocols()
-	return len(p) == 3 && p[2].Name == "utp"
-}
diff --git a/p2p/net/transport/utp.go b/p2p/net/transport/utp.go
index dd402448..3cf22e2d 100644
--- a/p2p/net/transport/utp.go
+++ b/p2p/net/transport/utp.go
@@ -7,6 +7,7 @@ import (
 	manet "gx/ipfs/QmQB7mNP3QE7b4zP2MQmsyJDqG5hzYE2CL8k1VyLWky2Ed/go-multiaddr-net"
 	mautp "gx/ipfs/QmQB7mNP3QE7b4zP2MQmsyJDqG5hzYE2CL8k1VyLWky2Ed/go-multiaddr-net/utp"
 	utp "gx/ipfs/QmVs3wq4cN64TFCxANzgSHjGPrjMnRnwPrxU8bqc7YP42s/utp"
+	mafmt "gx/ipfs/QmWLfU4tstw2aNcTykDm44xbSTCYJ9pUJwfhQCKGwckcHx/mafmt"
 	ma "gx/ipfs/QmcobAGsCjYt5DXoq9et9L8yR8er7o7Cu3DTvpaq12jYSz/go-multiaddr"
 )
 
@@ -22,8 +23,7 @@ func NewUtpTransport() *UtpTransport {
 }
 
 func (d *UtpTransport) Matches(a ma.Multiaddr) bool {
-	p := a.Protocols()
-	return len(p) == 3 && p[2].Name == "utp"
+	return mafmt.UTP.Matches(a)
 }
 
 type UtpSocket struct {
@@ -129,8 +129,7 @@ func (s *UtpSocket) Accept() (Conn, error) {
 }
 
 func (s *UtpSocket) Matches(a ma.Multiaddr) bool {
-	p := a.Protocols()
-	return len(p) == 3 && p[2].Name == "utp"
+	return mafmt.UTP.Matches(a)
 }
 
 func (t *UtpSocket) Close() error {
diff --git a/package.json b/package.json
index 01daac40..24974775 100644
--- a/package.json
+++ b/package.json
@@ -127,6 +127,12 @@
       "name": "go-peerstream",
       "hash": "QmQDPXRFzRcCGPbPViQCKjzbQBkZGpLV1f9KwXnksSNcTK",
       "version": "0.0.0"
+    },
+    {
+      "author": "whyrusleeping",
+      "name": "mafmt",
+      "hash": "QmWLfU4tstw2aNcTykDm44xbSTCYJ9pUJwfhQCKGwckcHx",
+      "version": "0.0.0"
     }
   ],
   "language": "go",