The following table lists the default TCP ports used by MongoDB:
| Default Port | Description |
27017 |
The default port for mongod and mongos instances. You can change this port with port or --port. |
27018 |
The default port for mongod when running with --shardsvr command-line option or the shardsvr value for the clusterRole setting in a configuration file. |
27019 |
The default port for mongod when running with --configsvr command-line option or the configsvr value for the clusterRole setting in a configuration file. |