# KnownHostNames Fields

- Package: [Aspire.Hosting](/reference/api/csharp/aspire.hosting.md)
- Type: [KnownHostNames](/reference/api/csharp/aspire.hosting/knownhostnames.md)
- Kind: `Fields`
- Members: `3`

Provides known host names for use within the Aspire application model API.

## DefaultContainerTunnelHostName

- Name: `DefaultContainerTunnelHostName`
- Modifiers: `static` `const`
- Returns: `string`

The host name used to facilitate connections originating from containers and ending on the host network.

```csharp
public const static string DefaultContainerTunnelHostName
```

## DockerDesktopHostBridge

- Name: `DockerDesktopHostBridge`
- Modifiers: `static` `const`
- Returns: `string`

The host name used by Docker Desktop host network bridge.

```csharp
public const static string DockerDesktopHostBridge
```

## Localhost

- Name: `Localhost`
- Modifiers: `static` `const`
- Returns: `string`

The host name associated with the IP loopback interface (localhost).

```csharp
public const static string Localhost
```

## Remarks

In general, "localhost" resolves to multiple addresses. E.g. in dual-stack systems (IPv4 and IPv6, very common) "localhost" resolves at least to 127.0.0.1 and [::1]. On some systems there are multiple IPv4 networks associated with loopback interface and the number of potential addresses for "localhost" increases accordingly.