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# NWMulticastGroup

A descriptor for a group you use to join an IP multicast group on a local network.

```
class NWMulticastGroup
```

## Overview> Important:
> In order to use multicast on iOS, your app will need to have the `com.apple.developer.networking.multicast` entitlement.

## Topics

### Essentials

  <doc://com.apple.documentation/documentation/BundleResources/Entitlements/com.apple.developer.networking.multicast>

### Defining Multicast Groups

[`init(for:from:disableUnicast:)`](/documentation/Network/NWMulticastGroup/init(for:from:disableUnicast:))

Initializes a multicast group with a set of multicast addresses.

### Inspecting Multicast Groups

[`members`](/documentation/Network/NWMulticastGroup/members)

The set of IP multicast group addresses that the connection group joins.

[`sourceFilter`](/documentation/Network/NWMulticastGroup/sourceFilter)

An optional address endpoint you provide to filter received multicast packets.

[`isUnicastDisabled`](/documentation/Network/NWMulticastGroup/isUnicastDisabled)

A Boolean that specifies whether the connection group rejects unicast traffic.


---

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