--- ../reach/protocol_content.go	2026-06-01 00:59:52.878098008 +0300
+++ ../reach/protocol_content.go	2026-06-01 01:01:31.035646085 +0300
@@ -3,6 +3,7 @@
 import (
 	"fmt"
 	"log"
+	"strconv"
 	"strings"
 
 	"github.com/luhring/reach/reach/set"
@@ -249,7 +250,7 @@
 	case ProtocolICMPv6:
 		return ProtocolNameICMPv6
 	default:
-		return string(pc.Protocol)
+		return strconv.Itoa(int(pc.Protocol))
 	}
 }