diff --git a/pkg/functions/runner.go b/pkg/functions/runner.go
index 27c4ce3895..d0eabcc02a 100644
--- a/pkg/functions/runner.go
+++ b/pkg/functions/runner.go
@@ -15,7 +15,7 @@ import (
 )
 
 const (
-	defaultRunHost    = "127.0.0.1" // TODO allow to be altered via a runOpt
+	defaultRunHost    = "127.0.0.1"
 	defaultRunPort    = "8080"
 	readinessEndpoint = "/health/readiness"
 )
@@ -26,6 +26,24 @@ type defaultRunner struct {
 	err    io.Writer
 }
 
+func ParseAddress(val string) (host, port string, explicitPort bool) {
+	if val == "" {
+		return defaultRunHost, defaultRunPort, false
+	}
+
+	if h, p, err := net.SplitHostPort(val); err == nil {
+		if h == "" {
+			h = defaultRunHost
+		}
+		if p == "" {
+			return h, defaultRunPort, false
+		}
+		return h, p, true
+	}
+
+	return val, defaultRunPort, false
+}
+
 func newDefaultRunner(client *Client, out, err io.Writer) *defaultRunner {
 	return &defaultRunner{
 		client: client,
@@ -41,17 +59,7 @@ func (r *defaultRunner) Run(ctx context.Context, f Function, address string, sta
 	)
 
 	// Parse address if provided, otherwise use defaults
-	host := defaultRunHost
-	port := defaultRunPort
-	explicitPort := address != ""
-
-	if address != "" {
-		var err error
-		host, port, err = net.SplitHostPort(address)
-		if err != nil {
-			return nil, fmt.Errorf("invalid address format '%s': %w", address, err)
-		}
-	}
+	host, port, explicitPort := ParseAddress(address)
 
 	port, err = choosePort(host, port, explicitPort)
 	if err != nil {
@@ -95,15 +103,7 @@ func getRunFunc(ctx context.Context, job *Job) (runFn func() error, err error) {
 		runFn = func() error { return runGo(ctx, job) }
 	case "python":
 		runFn = func() error { return runPython(ctx, job) }
-	case "springboot":
-		err = ErrRunnerNotImplemented{runtime}
-	case "node":
-		err = ErrRunnerNotImplemented{runtime}
-	case "typescript":
-		err = ErrRunnerNotImplemented{runtime}
-	case "rust":
-		err = ErrRunnerNotImplemented{runtime}
-	case "quarkus":
+	case "springboot", "node", "typescript", "rust", "quarkus":
 		err = ErrRunnerNotImplemented{runtime}
 	default:
 		err = ErrRuntimeNotRecognized{runtime}
diff --git a/pkg/functions/runner_test.go b/pkg/functions/runner_test.go
index 6b64816800..6eb8885476 100644
--- a/pkg/functions/runner_test.go
+++ b/pkg/functions/runner_test.go
@@ -39,3 +39,93 @@ func TestGetRunFuncErrors(t *testing.T) {
 		})
 	}
 }
+
+func TestParseAddress(t *testing.T) {
+	tests := []struct {
+		name         string
+		input        string
+		expectedHost string
+		expectedPort string
+		explicitPort bool
+	}{
+		{
+			name:         "empty value",
+			input:        "",
+			expectedHost: defaultRunHost,
+			expectedPort: defaultRunPort,
+			explicitPort: false,
+		},
+		{
+			name:         "host-only hostname",
+			input:        "localhost",
+			expectedHost: "localhost",
+			expectedPort: defaultRunPort,
+			explicitPort: false,
+		},
+		{
+			name:         "host-only ipv4",
+			input:        "127.0.0.2",
+			expectedHost: "127.0.0.2",
+			expectedPort: defaultRunPort,
+			explicitPort: false,
+		},
+		{
+			name:         "host-only ipv6",
+			input:        "::1",
+			expectedHost: "::1",
+			expectedPort: defaultRunPort,
+			explicitPort: false,
+		},
+		{
+			name:         "hostname with explicit port",
+			input:        "localhost:5000",
+			expectedHost: "localhost",
+			expectedPort: "5000",
+			explicitPort: true,
+		},
+		{
+			name:         "ipv4 with explicit port",
+			input:        "127.0.0.2:5000",
+			expectedHost: "127.0.0.2",
+			expectedPort: "5000",
+			explicitPort: true,
+		},
+		{
+			name:         "ipv6 with explicit port",
+			input:        "[::1]:5000",
+			expectedHost: "::1",
+			expectedPort: "5000",
+			explicitPort: true,
+		},
+		{
+			name:         "ipv4 with empty port",
+			input:        "127.0.0.1:",
+			expectedHost: "127.0.0.1",
+			expectedPort: defaultRunPort,
+			explicitPort: false,
+		},
+		{
+			name:         "empty host with explicit port",
+			input:        ":5000",
+			expectedHost: defaultRunHost,
+			expectedPort: "5000",
+			explicitPort: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			h, p, explicit := ParseAddress(tt.input)
+
+			if h != tt.expectedHost {
+				t.Errorf("host = %v, want %v", h, tt.expectedHost)
+			}
+			if p != tt.expectedPort {
+				t.Errorf("port = %v, want %v", p, tt.expectedPort)
+			}
+			if explicit != tt.explicitPort {
+				t.Errorf("explicitPort = %v, want %v", explicit, tt.explicitPort)
+			}
+		})
+	}
+}