It should be whatever is configured on your cassandra-env.sh
file. As per the docs:
http://wiki.apache.org/cassandra/FAQ#ports
Having said if you look at the .NET driver for Cassandra (C#) in the file Cassandra/Cluster.cs
it mentions that default from the driver is 9042
. You can see the file here: https://github.com/datastax/csharp-driver/blob/1.0/Cassandra/Cluster.cs . Also, this is the excerpt that shows the default port:
/// <summary>
/// The port to use to connect to the Cassandra host. If not set through this
/// method, the default port (9042) will be used instead.
/// </summary>
/// <param name="port"> the port to set. </param>
///
/// <returns>this Builder</returns>
public Builder WithPort(int port)
{
this._port = port;
return this;
}
Hope it helps.