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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `lookup_host` fn in crate `tokio`."><meta name="keywords" content="rust, rustlang, rust-lang, lookup_host"><title>tokio::net::lookup_host - Rust</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../favicon.svg">
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<link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc fn"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../tokio/index.html'><div class='logo-container rust-logo'><img src='../../rust-logo.png' alt='logo'></div></a><div class="sidebar-elems"><p class="location"><a href="../index.html">tokio</a>::<wbr><a href="index.html">net</a></p><script>window.sidebarCurrent = {name: "lookup_host", ty: "fn", relpath: ""};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><script src="../../theme.js"></script><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><span class="help-button">?</span>
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<a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span><a class="srclink" href="../../src/tokio/net/lookup_host.rs.html#32-37" title="goto source code">[src]</a></span><span class="in-band">Function <a href="../index.html">tokio</a>::<wbr><a href="index.html">net</a>::<wbr><a class="fn" href="">lookup_host</a></span></h1><pre class="rust fn">pub async fn lookup_host<T>(host: T) -> <a class="type" href="https://doc.rust-lang.org/nightly/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a><impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html" title="trait core::iter::traits::iterator::Iterator">Iterator</a><Item = <a class="enum" href="https://doc.rust-lang.org/nightly/std/net/addr/enum.SocketAddr.html" title="enum std::net::addr::SocketAddr">SocketAddr</a>>> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../tokio/net/trait.ToSocketAddrs.html" title="trait tokio::net::ToSocketAddrs">ToSocketAddrs</a>, </span></pre><div class="docblock"><p>Performs a DNS resolution.</p>
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<p>The returned iterator may not actually yield any values depending on the
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outcome of any resolution performed.</p>
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<p>This API is not intended to cover all DNS use cases. Anything beyond the
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basic use case should be done with a specialized library.</p>
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<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
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<p>To resolve a DNS entry:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">tokio</span>::<span class="ident">net</span>;
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>;
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<span class="attribute">#[<span class="ident">tokio</span>::<span class="ident">main</span>]</span>
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<span class="ident">async</span> <span class="kw">fn</span> <span class="ident">main</span>() <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
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<span class="kw">for</span> <span class="ident">addr</span> <span class="kw">in</span> <span class="ident">net</span>::<span class="ident">lookup_host</span>(<span class="string">"localhost:3000"</span>).<span class="ident">await</span><span class="question-mark">?</span> {
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"socket address is {}"</span>, <span class="ident">addr</span>);
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}
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<span class="prelude-val">Ok</span>(())
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}</pre></div>
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