diff --git a/IPAddr/Makefile b/IPAddr/Makefile
new file mode 100644
index 0000000..16c105a
--- /dev/null
+++ b/IPAddr/Makefile
@@ -0,0 +1,8 @@
+obj-m := ipaddr.o
+KDIR    := /lib/modules/$(shell uname -r)/build
+VERBOSE = 0
+
+all:
+	$(MAKE) -C $(KDIR) M=$(PWD) KBUILD_VERBOSE=$(VERBOSE) CONFIG_DEBUG_INFO=y modules
+clean:
+	rm -f *.o *.ko *.mod.c Module.symvers modules.order
diff --git a/IPAddr/ipaddr.c b/IPAddr/ipaddr.c
new file mode 100644
index 0000000..9723c93
--- /dev/null
+++ b/IPAddr/ipaddr.c
@@ -0,0 +1,59 @@
+#include <linux/inetdevice.h>
+
+static int my_inetaddr_event(struct notifier_block *nb,
+                             unsigned long event, void *ptr)
+{
+    struct in_ifaddr *ifa = ptr;
+    struct net_device *dev = ifa->ifa_dev->dev;
+    __be32 addr = ifa->ifa_address;
+
+    switch (event) {
+    case NETDEV_UP:            /* カーネルバージョンによっては使われ方が違うことも */
+    case NETDEV_CHANGEADDR:
+    case NETDEV_CHANGEINFODATA:
+    default:
+        break;
+    }
+
+    /* 典型的には、以下のようなイベントを拾う */
+    switch (event) {
+    case NETDEV_UP: /* 場合によっては ADDR_ADD */
+        pr_info("myhook: IPv4 addr added on %s: %pI4\n",
+                dev->name, &addr);
+        break;
+    case NETDEV_DOWN: /* 場合によっては ADDR_DEL */
+        pr_info("myhook: IPv4 addr removed on %s: %pI4\n",
+                dev->name, &addr);
+        break;
+    }
+
+    return NOTIFY_DONE;
+}
+
+static struct notifier_block my_inet_nb = {
+    .notifier_call = my_inetaddr_event,
+};
+
+static int __init mymod_init(void)
+{
+    int ret;
+
+    ret = register_inetaddr_notifier(&my_inet_nb);
+    if (ret) {
+        pr_err("myhook: register_inetaddr_notifier failed: %d\n", ret);
+        return ret;
+    }
+
+    /* さっきの netdevice_notifier も併用可能 */
+//    register_netdevice_notifier(&my_nb);
+
+    return 0;
+}
+
+static void __exit mymod_exit(void)
+{
+    unregister_inetaddr_notifier(&my_inet_nb);
+//    unregister_netdevice_notifier(&my_nb);
+}
+
+MODULE_LICENSE("GPL");
diff --git a/Netdevice/Makefile b/Netdevice/Makefile
new file mode 100644
index 0000000..b2bcafc
--- /dev/null
+++ b/Netdevice/Makefile
@@ -0,0 +1,8 @@
+obj-m := netdev.o
+KDIR    := /lib/modules/$(shell uname -r)/build
+VERBOSE = 0
+
+all:
+	$(MAKE) -C $(KDIR) M=$(PWD) KBUILD_VERBOSE=$(VERBOSE) CONFIG_DEBUG_INFO=y modules
+clean:
+	rm -f *.o *.ko *.mod.c Module.symvers modules.order
diff --git a/Netdevice/netdev.c b/Netdevice/netdev.c
new file mode 100644
index 0000000..45cc9db
--- /dev/null
+++ b/Netdevice/netdev.c
@@ -0,0 +1,59 @@
+#include <linux/module.h>
+#include <linux/netdevice.h>
+
+static int my_netdev_event(struct notifier_block *nb,
+                           unsigned long event, void *ptr)
+{
+    struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+
+    switch (event) {
+    case NETDEV_REGISTER:
+        pr_info("myhook: %s registered\n", dev->name);
+        break;
+    case NETDEV_UNREGISTER:
+        pr_info("myhook: %s unregistered\n", dev->name);
+        break;
+    case NETDEV_UP:
+        pr_info("myhook: %s is UP\n", dev->name);
+        break;
+    case NETDEV_DOWN:
+        pr_info("myhook: %s is DOWN\n", dev->name);
+        break;
+    case NETDEV_CHANGE:
+        pr_info("myhook: %s state changed\n", dev->name);
+        break;
+    default:
+        break;
+    }
+
+    return NOTIFY_DONE;
+}
+
+static struct notifier_block my_nb = {
+    .notifier_call = my_netdev_event,
+};
+
+static int __init mymod_init(void)
+{
+    int ret;
+
+    ret = register_netdevice_notifier(&my_nb);
+    if (ret)
+        pr_err("myhook: register_netdevice_notifier failed: %d\n", ret);
+    else
+        pr_info("myhook: loaded\n");
+
+    return ret;
+}
+
+static void __exit mymod_exit(void)
+{
+    unregister_netdevice_notifier(&my_nb);
+    pr_info("myhook: unloaded\n");
+}
+
+module_init(mymod_init);
+module_exit(mymod_exit);
+
+MODULE_LICENSE("GPL");
+