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NSNetServiceBrowser asynchronously lets you discover network domains and, additionally, search for a type of network service. It sends its delegate a message whenever it discovers a new network service, and whenever a network service goes away.

Each NSNetServiceBrowser performs one search at a time. So in order to perform multiple searches simultaneously, create multiple instances.

Code chunks

How to discover all service types in all domains

To discover all service types in all domains use

NSNetServiceBrowser *browser = [[NSNetServiceBrowser alloc] init];

[browser setDelegate: self];
[browser searchForServicesOfType: @"_services._dns-sd._udp."
                        inDomain: @""];

If you want a specific domain then set domain appropriately.