# Network Environments

There are 4 defined “networks”:

* *mainnet* – the main public network.
* *STN* (S\_caling Test Network\_) – a public test network targeted at testing scaling.
* *testnet* – a public test network, typically used for testing of software before release.
* *regnet* – a private “regression” test network, meant for local testing.

Nodes from different networks can co-exist on the same physical network; each public network uses a different set of seed nodes (if any) and ports for communications.

The BSV server software defaults to *mainnet*.