diff --git a/announce/message/message.go b/announce/message/message.go
index 5d04de5..c39fd26 100644
--- a/announce/message/message.go
+++ b/announce/message/message.go
@@ -2,6 +2,7 @@ package message
 
 import (
 	"errors"
+	"strings"
 
 	"github.com/ipfs/go-cid"
 	"github.com/multiformats/go-multiaddr"
@@ -38,13 +39,17 @@ func (m *Message) SetAddrs(addrs []multiaddr.Multiaddr) {
 // GetAddrs reads the slice of Multiaddr that is stored in the Message as a
 // slice of []byte.
 func (m *Message) GetAddrs() ([]multiaddr.Multiaddr, error) {
-	addrs := make([]multiaddr.Multiaddr, len(m.Addrs))
-	for i := range m.Addrs {
-		var err error
-		addrs[i], err = multiaddr.NewMultiaddrBytes(m.Addrs[i])
+	addrs := make([]multiaddr.Multiaddr, 0, len(m.Addrs))
+	for _, addrBytes := range m.Addrs {
+		addr, err := multiaddr.NewMultiaddrBytes(addrBytes)
 		if err != nil {
+			if strings.Contains(err.Error(), "no protocol with code") {
+				// Ignore unknown protocols.
+				continue
+			}
 			return nil, err
 		}
+		addrs = append(addrs, addr)
 	}
 	return addrs, nil
 }
diff --git a/announce/message/message_test.go b/announce/message/message_test.go
index 120a591..b6e7636 100644
--- a/announce/message/message_test.go
+++ b/announce/message/message_test.go
@@ -73,3 +73,18 @@ func TestJSON(t *testing.T) {
 
 	require.Equal(t, msg, newMsg)
 }
+
+func TestUnknownProtocol(t *testing.T) {
+	// Encoded unknown protocol code 9999: /ip4/127.0.0.1/udp/1234/<proto-9999>
+	addrData := []byte{54, 9, 108, 111, 99, 97, 108, 104, 111, 115, 116, 145, 2, 4, 210, 143, 78}
+	_, err := multiaddr.NewMultiaddrBytes(addrData)
+	require.ErrorContains(t, err, "no protocol with code")
+
+	var msg message.Message
+	msg.SetAddrs([]multiaddr.Multiaddr{maddr1})
+	msg.Addrs = append(msg.Addrs, addrData)
+
+	addrs, err := msg.GetAddrs()
+	require.NoError(t, err)
+	require.Equal(t, 1, len(addrs))
+}