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# portForName:host:nameServerPortNumber:

Looks up and returns the port registered under the specified name on a specified host.

```
- (NSPort *) portForName:(NSString *) name host:(NSString *) host nameServerPortNumber:(uint16_t) portNumber;
```

## Parameters

`name`

The name of the desired port.

`host`

The name of the host. `hostName` is an Internet domain name (for example, “`sales.anycorp.com`”) or IP address (IPv4 or IPv6). If `hostName` is `nil` or empty, the local host is checked. If `hostName` is `@”*”`, all hosts on the local network are checked.

`portNumber`

The `portNumber` parameter is ignored.

## Return Value

The port associated with `portName` on the host `hostName`. Returns `nil` if no such port exists.

## See Also

[`- (BOOL) registerPort:(NSPort *) port name:(NSString *) name nameServerPortNumber:(uint16_t) portNumber;`](/documentation/Foundation/NSSocketPortNameServer/registerPort:name:nameServerPortNumber:)

Registers a given port as a network service with the specified name in the local domain.


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