> ## Documentation Index
> Fetch the complete documentation index at: https://docs.iroh.computer/llms.txt
> Use this file to discover all available pages before exploring further.

# DHT

Discovery via DHT in iroh uses the [BitTorrent Mainline](https://en.wikipedia.org/wiki/Mainline_DHT) distributed hash table (DHT) to publish & resolve EndpointIds.

DHT Discovery is *not* enabled by default, and must be enabled by the user. You'll need to add the `discovery-pkarr-dht` feature flag to your `Cargo.toml` to use it.

```toml theme={null}
[dependencies]
# Make sure to use the most recent version here instead of nn. (at the time of writing: 0.32)
iroh = { version = "0.nn", features = ["discovery-pkarr-dht"] }
```

Then configure your endpoint to use DHT discovery concurrently with mDNS discovery, but not with the default DNS discovery, use the `Endpoint::empty_builder` method. This requires specifying a `RelayMode`, which in this example we will keep default.

```rust theme={null}
use iroh::Endpoint;

let dht_discovery = iroh::discovery::dht::DhtDiscovery::builder();
let mdns = iroh::discovery::mdns::MdnsDiscovery::builder();
let ep = Endpoint::empty_builder(iroh::RelayMode::Default)
    .discovery(dnt_discovery)
    .bind()
    .await?;
```