diff --git a/net-mgmt/zabbix-agent/pkg-descr b/net-mgmt/zabbix-agent/pkg-descr
index e080b7c51..f8168dc7c 100644
--- a/net-mgmt/zabbix-agent/pkg-descr
+++ b/net-mgmt/zabbix-agent/pkg-descr
@@ -12,6 +12,11 @@ WWW: https://www.zabbix.com/
 Plugin Changelog
 ----------------
 
+1.9
+
+Added:
+* Allow CIDR notation in "Zabbix Servers" field (#2296)
+
 1.8
 
 * Add Changelog (contributed by Starkstromkonsument)
diff --git a/net-mgmt/zabbix-agent/src/opnsense/mvc/app/models/OPNsense/ZabbixAgent/ZabbixAgent.xml b/net-mgmt/zabbix-agent/src/opnsense/mvc/app/models/OPNsense/ZabbixAgent/ZabbixAgent.xml
index aebf63777..346cba846 100644
--- a/net-mgmt/zabbix-agent/src/opnsense/mvc/app/models/OPNsense/ZabbixAgent/ZabbixAgent.xml
+++ b/net-mgmt/zabbix-agent/src/opnsense/mvc/app/models/OPNsense/ZabbixAgent/ZabbixAgent.xml
@@ -22,7 +22,7 @@
                     <default>127.0.0.1</default>
                     <Required>Y</Required>
                     <multiple>Y</multiple>
-                    <mask>/^([a-zA-Z0-9\.:\[\]\-]*?,)*([a-zA-Z0-9\.:\[\]\-]*)$/</mask>
+                    <mask>/^([a-zA-Z0-9\.:\[\]\-\/]*?,)*([a-zA-Z0-9\.:\[\]\-\/]*)$/</mask>
                     <ChangeCase>lower</ChangeCase>
                     <ValidationMessage>Please provide valid Zabbix server addresses, i.e. 10.0.0.1 or zabbix.example.com.</ValidationMessage>
                 </serverList>