diff --git a/rest_framework_sso/migrations/0003_sessiontoken_client_id.py b/rest_framework_sso/migrations/0003_sessiontoken_client_id.py
new file mode 100644
index 0000000..863cfdd
--- /dev/null
+++ b/rest_framework_sso/migrations/0003_sessiontoken_client_id.py
@@ -0,0 +1,18 @@
+# Generated by Django 3.2.7 on 2021-10-26 09:51
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("rest_framework_sso", "0002_sessiontoken_last_used_at"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="sessiontoken",
+            name="client_id",
+            field=models.CharField(blank=True, max_length=1000),
+        ),
+    ]
diff --git a/rest_framework_sso/models.py b/rest_framework_sso/models.py
index 0005b6e..cf1c712 100644
--- a/rest_framework_sso/models.py
+++ b/rest_framework_sso/models.py
@@ -28,6 +28,7 @@ class SessionToken(models.Model):
 
     id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False, db_index=True)
     user = models.ForeignKey(to=AUTH_USER_MODEL, related_name="+", on_delete=models.CASCADE, verbose_name=_("user"))
+    client_id = models.CharField(max_length=1000, blank=True)
     ip_address = models.GenericIPAddressField(null=True, blank=True, db_index=True)
     user_agent = models.CharField(max_length=1000, blank=True)
     last_used_at = models.DateTimeField(null=True, blank=True, db_index=True)
diff --git a/rest_framework_sso/serializers.py b/rest_framework_sso/serializers.py
index dd27e95..b6ebeaa 100644
--- a/rest_framework_sso/serializers.py
+++ b/rest_framework_sso/serializers.py
@@ -18,6 +18,7 @@
 class SessionTokenSerializer(serializers.Serializer):
     username = serializers.CharField(label=_("Username"))
     password = serializers.CharField(label=_("Password"), style={"input_type": "password"})
+    client_id = serializers.CharField(label=_("Client ID"), allow_blank=True, required=False, default="")
 
     def validate(self, attrs):
         username = attrs.get("username")
diff --git a/rest_framework_sso/views.py b/rest_framework_sso/views.py
index 45a07e9..45ba58c 100644
--- a/rest_framework_sso/views.py
+++ b/rest_framework_sso/views.py
@@ -72,9 +72,15 @@ def post(self, request, *args, **kwargs):
         serializer = self.get_serializer(data=request.data)
         serializer.is_valid(raise_exception=True)
         user = serializer.validated_data["user"]
-        session_token = SessionToken.objects.active().filter(user=user).with_user_agent(request=request).first()
+        client_id = serializer.validated_data["client_id"]
+        session_token = (
+            SessionToken.objects.active()
+            .filter(user=user, client_id=client_id)
+            .with_user_agent(request=request)
+            .first()
+        )
         if session_token is None:
-            session_token = SessionToken(user=user)
+            session_token = SessionToken(user=user, client_id=client_id)
         session_token.update_attributes(request=request)
         session_token.save()
         payload = create_session_payload(session_token=session_token, user=user)