diff --git a/man/signal-cli.1.adoc b/man/signal-cli.1.adoc
index b5c22167..58d373ed 100644
--- a/man/signal-cli.1.adoc
+++ b/man/signal-cli.1.adoc
@@ -124,6 +124,15 @@ Only works, if this is the master device.
 Specify the device you want to remove.
 Use listDevices to see the deviceIds.
 
+=== isRegistered
+
+Checks if a list of users are registered on Signal or not.
+
+[NUMBER [NUMBER ...]]::
+One or more numbers to check.
+*--json*::
+Output received messages in json format, one object per line.
+
 === send
 
 Send a message to another user or group.
diff --git a/src/main/java/org/asamk/signal/commands/Commands.java b/src/main/java/org/asamk/signal/commands/Commands.java
index 85e7af32..0ea53a70 100644
--- a/src/main/java/org/asamk/signal/commands/Commands.java
+++ b/src/main/java/org/asamk/signal/commands/Commands.java
@@ -11,6 +11,7 @@ public class Commands {
         addCommand("addDevice", new AddDeviceCommand());
         addCommand("block", new BlockCommand());
         addCommand("daemon", new DaemonCommand());
+        addCommand("isRegistered", new IsRegisteredCommand());
         addCommand("link", new LinkCommand());
         addCommand("listContacts", new ListContactsCommand());
         addCommand("listDevices", new ListDevicesCommand());
diff --git a/src/main/java/org/asamk/signal/commands/IsRegisteredCommand.java b/src/main/java/org/asamk/signal/commands/IsRegisteredCommand.java
new file mode 100644
index 00000000..ad65273d
--- /dev/null
+++ b/src/main/java/org/asamk/signal/commands/IsRegisteredCommand.java
@@ -0,0 +1,67 @@
+package org.asamk.signal.commands;
+
+import com.fasterxml.jackson.annotation.JsonAutoDetect;
+import com.fasterxml.jackson.annotation.PropertyAccessor;
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.databind.DeserializationFeature;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import net.sourceforge.argparse4j.impl.Arguments;
+import net.sourceforge.argparse4j.inf.Namespace;
+import net.sourceforge.argparse4j.inf.Subparser;
+
+import org.asamk.signal.manager.Manager;
+
+import java.io.IOException;
+
+public class IsRegisteredCommand implements LocalCommand {
+
+    @Override
+    public void attachToSubparser(final Subparser subparser) {
+        subparser.addArgument("number").help("Phone number").nargs("+");
+        subparser.help("Check if the specified phone number/s have been registered");
+        subparser.addArgument("--json")
+                .help("Output received messages in json format, one json object per line.")
+                .action(Arguments.storeTrue());
+    }
+
+    @Override
+    public int handleCommand(final Namespace ns, final Manager m) {
+        if (!m.isRegistered()) {
+            System.err.println("User is not registered.");
+            return 1;
+        }
+
+        ObjectMapper jsonProcessor = new ObjectMapper();
+        jsonProcessor.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY); // disable autodetect
+        jsonProcessor.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
+        jsonProcessor.disable(JsonGenerator.Feature.AUTO_CLOSE_TARGET);
+
+        for (String phone_number : ns.<String>getList("number")) {
+            try {
+                boolean isRegistered = m.isUserRegistered(phone_number);
+                if (ns.getBoolean("json")) {
+                    JsonIsReceived object = new JsonIsReceived(phone_number, isRegistered);
+                    System.out.println(jsonProcessor.writeValueAsString(object));
+                } else {
+                    System.out.println(phone_number + ": " + isRegistered);
+                }
+            } catch (IOException e) {
+                System.err.println(e.getMessage());
+            }
+        }
+
+        return 0;
+    }
+
+    private class JsonIsReceived {
+        String name;
+        boolean isRegistered;
+
+        public JsonIsReceived(String name, boolean isRegistered) {
+            this.name = name;
+            this.isRegistered = isRegistered;
+        }
+    }
+
+}
diff --git a/src/main/java/org/asamk/signal/manager/Manager.java b/src/main/java/org/asamk/signal/manager/Manager.java
index 8a46846f..06582f08 100644
--- a/src/main/java/org/asamk/signal/manager/Manager.java
+++ b/src/main/java/org/asamk/signal/manager/Manager.java
@@ -345,6 +345,22 @@ public class Manager implements Closeable {
         return account.isRegistered();
     }
 
+    /**
+     * This is used for checking if someone else's number is registered on Signal
+     *
+     * @param number The phone number in question
+     * @return True if registered, false otherwise
+     * @throws IOException if its unable to check if the user is registered
+     */
+    public boolean isUserRegistered(String number) throws IOException {
+        ContactTokenDetails details = this.accountManager.getContact(number).orNull();
+        if (details == null) {
+            return false;
+        }
+
+        return true;
+    }
+
     public void register(boolean voiceVerification, String captcha) throws IOException {
         account.setPassword(KeyUtils.createPassword());