diff --git a/cmd/cmd_check.go b/cmd/cmd_check.go
index 7d3aced..593879e 100644
--- a/cmd/cmd_check.go
+++ b/cmd/cmd_check.go
@@ -6,6 +6,7 @@ import (
 
 func init() {
 	checkCmd.AddCommand(checkBoxCmd)
+	checkCmd.AddCommand(checkAllCmd)
 	rootCmd.AddCommand(checkCmd)
 }
 
@@ -26,3 +27,12 @@ var checkBoxCmd = &cobra.Command{
 		return checkAndNotify(args)
 	},
 }
+
+var checkAllCmd = &cobra.Command{
+	Use:   "all",
+	Short: "one-off check on all boxes registered on the opensensemap instance",
+	RunE: func(cmd *cobra.Command, args []string) error {
+		cmd.SilenceUsage = true
+		return checkAndNotifyAll()
+	},
+}
diff --git a/cmd/cmd_watch.go b/cmd/cmd_watch.go
index 471fba7..63c032d 100644
--- a/cmd/cmd_watch.go
+++ b/cmd/cmd_watch.go
@@ -18,6 +18,7 @@ func init() {
 	viper.BindPFlags(watchCmd.PersistentFlags())
 
 	watchCmd.AddCommand(watchBoxesCmd)
+	watchCmd.AddCommand(watchAllCmd)
 	rootCmd.AddCommand(watchCmd)
 }
 
@@ -54,3 +55,27 @@ var watchBoxesCmd = &cobra.Command{
 		}
 	},
 }
+
+var watchAllCmd = &cobra.Command{
+	Use:   "all",
+	Short: "watch all boxes registered on the map",
+	PreRun: func(cmd *cobra.Command, args []string) {
+		interval := viper.GetDuration("interval") * time.Minute
+		ticker = time.NewTicker(interval).C
+	},
+	RunE: func(cmd *cobra.Command, args []string) error {
+		cmd.SilenceUsage = true
+		err := checkAndNotifyAll()
+		if err != nil {
+			return err
+		}
+		for {
+			<-ticker
+			err = checkAndNotifyAll()
+			if err != nil {
+				// we already did retries, so exiting seems appropriate
+				return err
+			}
+		}
+	},
+}
diff --git a/cmd/shared.go b/cmd/shared.go
index 74c169e..ff9a519 100644
--- a/cmd/shared.go
+++ b/cmd/shared.go
@@ -5,6 +5,7 @@ import (
 	"regexp"
 	"strings"
 
+	log "github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
 
@@ -33,6 +34,26 @@ func BoxIdValidator(cmd *cobra.Command, args []string) error {
 	return nil
 }
 
+func checkAndNotifyAll() error {
+	log.Info("getting list of boxes...")
+
+	// fetch all boxes first & extract their IDs
+	osem := core.NewOsemClient(viper.GetString("api"))
+	boxes, err := osem.GetAllBoxes()
+	if err != nil {
+		return err
+	}
+	boxIDs := make([]string, len(*boxes))
+	for i, box := range *boxes {
+		boxIDs[i] = box.Id
+	}
+
+	// then check each box individually. we only pass the ID
+	// and fetch again, because box metadata is different in
+	// GetAllBoxes and GetBox..
+	return checkAndNotify(boxIDs)
+}
+
 func checkAndNotify(boxIds []string) error {
 	boxLocalConfig := map[string]*core.NotifyConfig{}
 	for _, boxID := range boxIds {
diff --git a/core/osem_api.go b/core/osem_api.go
index 59ed708..7b18d08 100644
--- a/core/osem_api.go
+++ b/core/osem_api.go
@@ -33,6 +33,16 @@ func (client *OsemClient) GetBox(boxId string) (*Box, error) {
 	return box, nil
 }
 
+func (client *OsemClient) GetAllBoxes() (*[]Box, error) {
+	boxes := &[]Box{}
+	fail := &OsemError{}
+	client.sling.New().Path("boxes").Receive(boxes, fail)
+	if fail.Message != "" {
+		return boxes, errors.New("could not fetch boxes: " + fail.Message)
+	}
+	return boxes, nil
+}
+
 type NotifyEvent struct {
 	Type      string `json:"type"`
 	Target    string `json:"target"`