diff --git a/lib/zinnia.js b/lib/zinnia.js
index 93d8576d..9cac60cb 100644
--- a/lib/zinnia.js
+++ b/lib/zinnia.js
@@ -85,7 +85,7 @@ const maybeReportErrorToSentry = (/** @type {unknown} */ err) => {
 }
 
 const matchesSubnetFilter = (subnet) =>
-  SUBNET_FILTER === '' || subnet === SUBNET_FILTER
+  SUBNET_FILTER === '' || SUBNET_FILTER.split(',').includes(subnet);
 
 const capitalize = (str) => `${str.charAt(0).toUpperCase()}${str.slice(1)}`