diff --git a/common/config_struct.go b/common/config_struct.go
index 87d13ba..e40323c 100644
--- a/common/config_struct.go
+++ b/common/config_struct.go
@@ -32,6 +32,7 @@ type Config struct {
 	DisableBrute            bool          // 禁用暴力破解
 	DisablePing             bool          // 禁用Ping检测
 	DisableTcpProbe         bool          // 禁用TCP补充探测
+	DisableSubnetProbe      bool          // 禁用网段预筛
 
 	// 扫描模式
 	Mode               string // 扫描模式
@@ -200,7 +201,8 @@ func NewConfig() *Config {
 		ModuleThreadNum: 10,
 		DisableBrute:    false,
 		DisablePing:     false,
-		DisableTcpProbe: false,
+		DisableTcpProbe:    false,
+		DisableSubnetProbe: false,
 
 		// 扫描模式
 		Mode:       DefaultScanMode,
diff --git a/common/flag.go b/common/flag.go
index f6bfd2e..a3f24d7 100644
--- a/common/flag.go
+++ b/common/flag.go
@@ -113,6 +113,7 @@ func Flag(Info *HostInfo) error {
 	flag.Int64Var(&fv.GlobalTimeout, "gt", 180, i18n.GetText("flag_global_timeout"))
 	flag.BoolVar(&fv.DisablePing, "np", false, i18n.GetText("flag_disable_ping"))
 	flag.BoolVar(&fv.DisableTcpProbe, "ntp", false, i18n.GetText("flag_disable_tcp_probe"))
+	flag.BoolVar(&fv.DisableSubnetProbe, "nsp", false, i18n.GetText("flag_disable_subnet_probe"))
 	flag.StringVar(&fv.LocalPlugin, "local", "", i18n.GetText("flag_local_plugin"))
 	flag.BoolVar(&fv.AliveOnly, "ao", false, i18n.GetText("flag_alive_only"))
 
diff --git a/common/flag_config.go b/common/flag_config.go
index b2b4d3a..79c23da 100644
--- a/common/flag_config.go
+++ b/common/flag_config.go
@@ -41,6 +41,7 @@ type FlagVars struct {
 	GlobalTimeout           int64
 	DisablePing             bool
 	DisableTcpProbe         bool
+	DisableSubnetProbe      bool
 	LocalPlugin             string
 	AliveOnly               bool
 	DisableBrute            bool
@@ -150,6 +151,7 @@ func BuildConfigFromFlags(fv *FlagVars) *Config {
 		DisableBrute:            fv.DisableBrute,
 		DisablePing:             fv.DisablePing,
 		DisableTcpProbe:         fv.DisableTcpProbe,
+		DisableSubnetProbe:      fv.DisableSubnetProbe,
 
 		// 扫描模式
 		Mode:               fv.ScanMode,
diff --git a/common/i18n/locales/en.yaml b/common/i18n/locales/en.yaml
index c308cf6..8916b6b 100644
--- a/common/i18n/locales/en.yaml
+++ b/common/i18n/locales/en.yaml
@@ -30,6 +30,8 @@ flag_disable_ping:
   other: "Disable ping detection"
 flag_disable_tcp_probe:
   other: "Disable TCP supplementary probe"
+flag_disable_subnet_probe:
+  other: "Disable subnet pre-filter (optimization that skips empty /24 subnets in large scans)"
 flag_local_plugin:
   other: "Specify local plugin name (e.g.: cleaner, systeminfo, keylogger)"
 flag_debug:
diff --git a/common/i18n/locales/zh.yaml b/common/i18n/locales/zh.yaml
index 94eb728..c4ee421 100644
--- a/common/i18n/locales/zh.yaml
+++ b/common/i18n/locales/zh.yaml
@@ -30,6 +30,8 @@ flag_disable_ping:
   other: "禁用ping探测"
 flag_disable_tcp_probe:
   other: "禁用TCP补充探测"
+flag_disable_subnet_probe:
+  other: "禁用网段预筛（大规模扫描时跳过空 /24 网段的优化）"
 flag_local_plugin:
   other: "指定本地插件名称 (如: cleaner, systeminfo, keylogger 等)"
 flag_debug:
diff --git a/core/port_scan.go b/core/port_scan.go
index 05e2ba9..9a95820 100644
--- a/core/port_scan.go
+++ b/core/port_scan.go
@@ -147,7 +147,7 @@ func EnhancedPortScan(ctx context.Context, hosts []string, ports string, timeout
 	session.LogDebug(i18n.Tr("port_scan_debug_start", len(hosts), config.ThreadNum))
 
 	// 大规模扫描预筛：跨多个 /24 时先做网段探活，跳过空网段
-	if len(hosts) > subnetProbeThreshold {
+	if !config.DisableSubnetProbe && len(hosts) > subnetProbeThreshold {
 		hosts = probeSubnets(ctx, hosts, time.Duration(timeout)*time.Second, session)
 		if len(hosts) == 0 {
 			session.LogInfo(i18n.GetText("port_scan_no_alive_subnet"))
diff --git a/pkg/fscan/scanner.go b/pkg/fscan/scanner.go
index 9a397b7..c5845f6 100644
--- a/pkg/fscan/scanner.go
+++ b/pkg/fscan/scanner.go
@@ -411,6 +411,7 @@ func buildFlagVars(config Config, target Target) *common.FlagVars {
 		GlobalTimeout:       180,
 		DisablePing:         config.DisablePing,
 		DisableTcpProbe:     config.DisableTCPProbe,
+		DisableSubnetProbe:  config.DisableSubnetProbe,
 		AliveOnly:           false,
 		DisableBrute:        config.DisableBrute,
 		MaxRetries:          maxRetries,
diff --git a/pkg/fscan/types.go b/pkg/fscan/types.go
index 615e7ff..02428a7 100644
--- a/pkg/fscan/types.go
+++ b/pkg/fscan/types.go
@@ -133,9 +133,10 @@ type Config struct {
 	ModuleThreads int
 	MaxRetries    int
 
-	DisablePing     bool
-	DisableTCPProbe bool
-	DisableBrute    bool
+	DisablePing        bool
+	DisableTCPProbe    bool
+	DisableSubnetProbe bool
+	DisableBrute       bool
 
 	Usernames       []string
 	Passwords       []string
diff --git a/web/api/scan.go b/web/api/scan.go
index 320908d..6858f0b 100644
--- a/web/api/scan.go
+++ b/web/api/scan.go
@@ -38,8 +38,9 @@ type ScanRequest struct {
 	ThreadNum       int    `json:"thread_num"`
 	Timeout         int    `json:"timeout"`
 	ModuleThreadNum int    `json:"module_thread_num"`
-	DisablePing     bool   `json:"disable_ping"`
-	DisableBrute    bool   `json:"disable_brute"`
+	DisablePing        bool `json:"disable_ping"`
+	DisableBrute       bool `json:"disable_brute"`
+	DisableSubnetProbe bool `json:"disable_subnet_probe"`
 	AliveOnly       bool   `json:"alive_only"`
 
 	// 认证
@@ -199,6 +200,7 @@ func (h *ScanHandler) runScan(req ScanRequest) {
 	}
 	fv.DisablePing = req.DisablePing
 	fv.DisableBrute = req.DisableBrute
+	fv.DisableSubnetProbe = req.DisableSubnetProbe
 	fv.AliveOnly = req.AliveOnly
 	fv.Username = req.Username
 	fv.Password = req.Password