diff --git a/cmd/uncloud/machine/add.go b/cmd/uncloud/machine/add.go
index 6f24d36a..85fb9590 100644
--- a/cmd/uncloud/machine/add.go
+++ b/cmd/uncloud/machine/add.go
@@ -71,7 +71,8 @@ Connection methods:
 			return add(cmd.Context(), uncli, remoteMachine, opts)
 		},
 	}
-	cmd.Flags().StringVarP(&opts.name, "name", "n", "", "Assign a name to the machine.")
+	cmd.Flags().StringVarP(&opts.name, "name", "n", "",
+		"Assign a name to the machine. (default is the machine's hostname)")
 	cmd.Flags().BoolVar(
 		&opts.noCaddy, "no-caddy", false,
 		"Don't deploy Caddy reverse proxy service to the machine.",
diff --git a/cmd/uncloud/machine/init.go b/cmd/uncloud/machine/init.go
index b73a7c0a..99559890 100644
--- a/cmd/uncloud/machine/init.go
+++ b/cmd/uncloud/machine/init.go
@@ -101,7 +101,7 @@ Connection methods:
 		"API endpoint for the Uncloud DNS service.")
 	cmd.Flags().StringVarP(
 		&opts.name, "name", "n", "",
-		"Assign a name to the machine.",
+		"Assign a name to the machine. (default is the machine's hostname)",
 	)
 	cmd.Flags().StringVar(
 		&opts.network, "network", cluster.DefaultNetwork.String(),
diff --git a/internal/cli/cli.go b/internal/cli/cli.go
index 145960ee..0ab60d04 100644
--- a/internal/cli/cli.go
+++ b/internal/cli/cli.go
@@ -11,6 +11,7 @@ import (
 	"github.com/psviderski/uncloud/internal/cli/config"
 	"github.com/psviderski/uncloud/internal/machine"
 	"github.com/psviderski/uncloud/internal/machine/api/pb"
+	"github.com/psviderski/uncloud/internal/machine/cluster"
 	"github.com/psviderski/uncloud/internal/machine/network"
 	"github.com/psviderski/uncloud/internal/sshexec"
 	"github.com/psviderski/uncloud/pkg/api"
@@ -330,7 +331,7 @@ type AddMachineOptions struct {
 // The cluster client is connected to the existing machine in the cluster. It was used to add the new machine to the
 // cluster. The machine client is connected to the new machine and can be used to interact with it.
 // Both client should be closed after use by the caller.
-func (cli *CLI) AddMachine(ctx context.Context, opts AddMachineOptions) (*client.Client, *client.Client, error) {
+func (cli *CLI) AddMachine(ctx context.Context, opts AddMachineOptions) (_ *client.Client, _ *client.Client, err error) {
 	contextName := cli.ContextOverrideOrCurrent()
 	c, err := cli.ConnectCluster(ctx)
 	if err != nil {
@@ -351,16 +352,19 @@ func (cli *CLI) AddMachine(ctx context.Context, opts AddMachineOptions) (*client
 			machineClient.Close()
 		}
 	}()
+	// IMPORTANT: 'err' is a named return value so the deferred cleanups above observe it on every error return.
+	// Do not shadow it with ':=' in a nested scope, or the deferred client cleanup would be skipped on error.
 
 	// Check if the machine is already initialised as a cluster member and prompt the user to reset it first.
-	// TODO: refactor to use client.InspectMachine.
-	minfo, err := machineClient.Inspect(ctx, &emptypb.Empty{})
+	inspectResp, err := machineClient.MachineClient.InspectMachine(ctx, nil)
 	if err != nil {
 		return nil, nil, fmt.Errorf("inspect machine: %w", err)
 	}
+	minfo := inspectResp.Machines[0].Machine
 	if minfo.Id != "" {
 		// Check if the machine is already a member of this cluster.
-		machines, err := c.ListMachines(ctx, nil)
+		var machines api.MachineMembersList
+		machines, err = c.ListMachines(ctx, nil)
 		if err != nil {
 			return nil, nil, fmt.Errorf("list cluster machines: %w", err)
 		}
@@ -416,8 +420,24 @@ func (cli *CLI) AddMachine(ctx context.Context, opts AddMachineOptions) (*client
 			endpoints[i] = pb.NewIPPort(addrPort)
 		}
 	}
+	// Default the machine name to the machine's hostname when not explicitly provided, ensuring it is
+	// unique within the cluster.
+	machineName := opts.MachineName
+	if machineName == "" {
+		var machines api.MachineMembersList
+		if machines, err = c.ListMachines(ctx, nil); err != nil {
+			return nil, nil, fmt.Errorf("list cluster machines: %w", err)
+		}
+		existing := make([]string, len(machines))
+		for i, m := range machines {
+			existing[i] = m.Machine.Name
+		}
+		if machineName, err = cluster.DefaultMachineName(minfo.Hostname, existing); err != nil {
+			return nil, nil, fmt.Errorf("generate machine name: %w", err)
+		}
+	}
 	addReq := &pb.AddMachineRequest{
-		Name: opts.MachineName,
+		Name: machineName,
 		Network: &pb.NetworkConfig{
 			Endpoints: endpoints,
 			PublicKey: token.PublicKey,
@@ -439,7 +459,7 @@ func (cli *CLI) AddMachine(ctx context.Context, opts AddMachineOptions) (*client
 
 	// Snapshot the cluster store version so the new machine can catch up before participating.
 	var storeVersion map[string]int64
-	inspectResp, err := c.MachineClient.InspectMachine(ctx, &emptypb.Empty{})
+	inspectResp, err = c.MachineClient.InspectMachine(ctx, &emptypb.Empty{})
 	if err != nil {
 		// TODO(lhf): remove Unimplemented check when v0.17.0 is released.
 		if status.Convert(err).Code() != codes.Unimplemented {
diff --git a/internal/machine/api/pb/machine.pb.go b/internal/machine/api/pb/machine.pb.go
index fe1991ec..94fe76c9 100644
--- a/internal/machine/api/pb/machine.pb.go
+++ b/internal/machine/api/pb/machine.pb.go
@@ -32,6 +32,8 @@ type MachineInfo struct {
 	Name     string         `protobuf:"bytes,2,opt,name=name,proto3" json:"name,omitempty"`
 	Network  *NetworkConfig `protobuf:"bytes,3,opt,name=network,proto3" json:"network,omitempty"`
 	PublicIp *IP            `protobuf:"bytes,4,opt,name=public_ip,json=publicIp,proto3" json:"public_ip,omitempty"`
+	// Operating system hostname of the machine.
+	Hostname string `protobuf:"bytes,5,opt,name=hostname,proto3" json:"hostname,omitempty"`
 }
 
 func (x *MachineInfo) Reset() {
@@ -94,6 +96,13 @@ func (x *MachineInfo) GetPublicIp() *IP {
 	return nil
 }
 
+func (x *MachineInfo) GetHostname() string {
+	if x != nil {
+		return x.Hostname
+	}
+	return ""
+}
+
 type NetworkConfig struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1131,7 +1140,7 @@ var file_internal_machine_api_pb_machine_proto_rawDesc = []byte{
 	0x74, 0x61, 0x6d, 0x70, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x1a, 0x24, 0x69, 0x6e, 0x74, 0x65,
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+	0x22, 0xa1, 0x01, 0x0a, 0x0b, 0x4d, 0x61, 0x63, 0x68, 0x69, 0x6e, 0x65, 0x49, 0x6e, 0x66, 0x6f,
 	0x12, 0x0e, 0x0a, 0x02, 0x69, 0x64, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x02, 0x69, 0x64,
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@@ -1139,201 +1148,203 @@ var file_internal_machine_api_pb_machine_proto_rawDesc = []byte{
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 }
 
 var (
diff --git a/internal/machine/api/pb/machine.proto b/internal/machine/api/pb/machine.proto
index 59c336a6..68e24cd6 100644
--- a/internal/machine/api/pb/machine.proto
+++ b/internal/machine/api/pb/machine.proto
@@ -34,6 +34,8 @@ message MachineInfo {
   string name = 2;
   NetworkConfig network = 3;
   IP public_ip = 4;
+  // Operating system hostname of the machine.
+  string hostname = 5;
 }
 
 message NetworkConfig {
diff --git a/internal/machine/cluster/machine.go b/internal/machine/cluster/machine.go
index 02968d3d..78fbe420 100644
--- a/internal/machine/cluster/machine.go
+++ b/internal/machine/cluster/machine.go
@@ -2,6 +2,8 @@ package cluster
 
 import (
 	"fmt"
+	"slices"
+	"strings"
 
 	"github.com/psviderski/uncloud/internal/secret"
 )
@@ -19,3 +21,46 @@ func NewRandomMachineName() (string, error) {
 	}
 	return "machine-" + suffix, nil
 }
+
+// DefaultMachineName derives a machine name from the given hostname, falling back to a random name if
+// no valid name can be derived from it. It then ensures the name is unique among existing by appending
+// a numeric suffix ("-1", "-2", etc.) if needed.
+func DefaultMachineName(hostname string, existing []string) (string, error) {
+	name := machineNameFromHostname(hostname)
+	if name == "" {
+		var err error
+		if name, err = NewRandomMachineName(); err != nil {
+			return "", err
+		}
+	}
+
+	if !slices.Contains(existing, name) {
+		return name, nil
+	}
+	for i := 1; ; i++ {
+		candidate := fmt.Sprintf("%s-%d", name, i)
+		if !slices.Contains(existing, candidate) {
+			return candidate, nil
+		}
+	}
+}
+
+// machineNameFromHostname derives a machine name from a hostname.
+// It returns an empty string if no valid name can be derived.
+func machineNameFromHostname(hostname string) string {
+	// Use the first DNS label only, e.g. "web-1.example.com" becomes "web-1".
+	label, _, _ := strings.Cut(hostname, ".")
+	label = strings.ToLower(strings.TrimSpace(label))
+
+	var b strings.Builder
+	for _, r := range label {
+		switch {
+		case r >= 'a' && r <= 'z', r >= '0' && r <= '9', r == '-', r == '_':
+			b.WriteRune(r)
+		default:
+			b.WriteRune('-')
+		}
+	}
+	// Trim leading and trailing hyphens that may result from the sanitisation above.
+	return strings.Trim(b.String(), "-")
+}
diff --git a/internal/machine/cluster/machine_test.go b/internal/machine/cluster/machine_test.go
new file mode 100644
index 00000000..1129c78f
--- /dev/null
+++ b/internal/machine/cluster/machine_test.go
@@ -0,0 +1,65 @@
+package cluster
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestMachineNameFromHostname(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		name     string
+		hostname string
+		want     string
+	}{
+		{"simple", "web", "web"},
+		{"fqdn uses first label", "web-1.example.com", "web-1"},
+		{"uppercase lowercased", "Web-Server", "web-server"},
+		{"invalid chars replaced", "host_name@1", "host_name-1"},
+		{"trim surrounding hyphens", "-_host_-", "_host_"},
+		{"whitespace trimmed", "  myhost  ", "myhost"},
+		{"empty", "", ""},
+		{"only invalid chars", "@#", ""},
+		{"dot only", ".example.com", ""},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+			assert.Equal(t, tt.want, machineNameFromHostname(tt.hostname))
+		})
+	}
+}
+
+func TestDefaultMachineName(t *testing.T) {
+	t.Parallel()
+
+	t.Run("falls back to random", func(t *testing.T) {
+		// An empty or fully invalid hostname falls back to a random "machine-xxxx" name.
+		got, err := DefaultMachineName("***", nil)
+		require.NoError(t, err)
+		assert.Regexp(t, `^machine-[a-zA-Z0-9]{4}$`, got)
+	})
+
+	tests := []struct {
+		name     string
+		hostname string
+		existing []string
+		want     string
+	}{
+		{"from hostname", "web-1.example.com", nil, "web-1"},
+		{"dedup against existing", "web", []string{"web"}, "web-1"},
+		{"dedup multiple", "web", []string{"web", "web-1"}, "web-2"},
+		{"sanitized", "My_Host", nil, "my_host"},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+			got, err := DefaultMachineName(tt.hostname, tt.existing)
+			require.NoError(t, err)
+			assert.Equal(t, tt.want, got)
+		})
+	}
+}
diff --git a/internal/machine/machine.go b/internal/machine/machine.go
index 0f0af910..9f3d3152 100644
--- a/internal/machine/machine.go
+++ b/internal/machine/machine.go
@@ -766,9 +766,11 @@ func (m *Machine) InitCluster(ctx context.Context, req *pb.InitClusterRequest) (
 	}
 	slog.Info("Cluster state initialised.", "network", clusterNetwork.String())
 
+	// Default the machine name to the machine's hostname when not explicitly provided.
 	machineName := req.MachineName
 	if machineName == "" {
-		if machineName, err = cluster.NewRandomMachineName(); err != nil {
+		hostname, _ := os.Hostname()
+		if machineName, err = cluster.DefaultMachineName(hostname, nil); err != nil {
 			return nil, status.Errorf(codes.Internal, "generate machine name: %v", err)
 		}
 	}
@@ -996,6 +998,8 @@ func (m *Machine) Inspect(_ context.Context, _ *emptypb.Empty) (*pb.MachineInfo,
 }
 
 func (m *Machine) InspectMachine(ctx context.Context, _ *emptypb.Empty) (*pb.InspectMachineResponse, error) {
+	hostname, _ := os.Hostname()
+
 	storeVersion, err := m.store.Version(ctx)
 	if err != nil {
 		return nil, status.Errorf(codes.Internal, "get cluster store version: %v", err)
@@ -1014,8 +1018,9 @@ func (m *Machine) InspectMachine(ctx context.Context, _ *emptypb.Empty) (*pb.Ins
 			{
 				// Metadata is injected by the gRPC proxy.
 				Machine: &pb.MachineInfo{
-					Id:   m.state.ID,
-					Name: m.state.Name,
+					Id:       m.state.ID,
+					Name:     m.state.Name,
+					Hostname: hostname,
 					Network: &pb.NetworkConfig{
 						Subnet:       pb.NewIPPrefix(m.state.Network.Subnet),
 						ManagementIp: pb.NewIP(m.state.Network.ManagementIP),