{"id":"ipv4-subnet-calculator","engine":"core","category":"web","name":"IPv4 subnet calculator","fields":[{"key":"ip","label":"IPv4 address","type":"text","default":"192.168.1.42","required":true},{"key":"prefix","label":"CIDR prefix","type":"number","default":24,"required":true,"min":0,"max":32}],"sample":{"ip":"192.168.1.42","prefix":24}}