diff --git a/ip_listener/cli.py b/ip_listener/cli.py
index 8fe6ffb..8db0a00 100644
--- a/ip_listener/cli.py
+++ b/ip_listener/cli.py
@@ -6,6 +6,6 @@ from ip_listener.main import detect
 @click.command()
 @click.argument("domains", envvar="DOMAIN", nargs=-1)
 @click.argument("token", envvar="TOKEN")
-@click.option("--read-only", envvar="READ_ONLY", default=False)
-def run(domains, token):
-    detect(domains, token)
+@click.option("--read-only/--write", envvar="READ_ONLY", default=False)
+def run(domains, token, read_only):
+    detect(domains, token, read_only)
diff --git a/ip_listener/main.py b/ip_listener/main.py
index 10f3774..5474cc1 100644
--- a/ip_listener/main.py
+++ b/ip_listener/main.py
@@ -51,7 +51,10 @@ def _update_domain(domain, payload, token):
     return requests.put(url, data=json.dumps(payload), headers=headers)
 
 
-def _update_domains(updated_domains, token):
+def _update_domains(updated_domains, token, read_only):
+    if read_only:
+        return
+
     with ThreadPoolExecutor(max_workers=10) as executor:
         futures = {
             executor.submit(_update_domain, domain, entries, token): domain
@@ -71,7 +74,7 @@ def _update_domains(updated_domains, token):
             logger.info(f"Updated domain {domain}")
 
 
-def detect(domains, token):
+def detect(domains, token, read_only):
     ip = _get_ip()
     domain_data = _get_domain_data(domains, token)
     updated_domains = {}