Bun implements the `node:dns` module.

```ts
import * as dns from "node:dns";

const addrs = await dns.promises.resolve4("bun.sh", { ttl: true });
console.log(addrs);
// => [{ address: "172.67.161.226", family: 4, ttl: 0 }, ...]
```

<!--
## `Bun.dns` - lookup a domain
`Bun.dns` includes utilities to make DNS requests, similar to `node:dns`. As of Bun v0.5.0, the only implemented function is `dns.lookup`, though more will be implemented soon.
You can lookup the IP addresses of a hostname by using `dns.lookup`.
```ts
import { dns } from "bun";
const [{ address }] = await dns.lookup("example.com");
console.log(address); // "93.184.216.34"
```
If you need to limit IP addresses to either IPv4 or IPv6, you can specify the `family` as an option.
```ts
import { dns } from "bun";
const [{ address }] = await dns.lookup("example.com", { family: 6 });
console.log(address); // "2606:2800:220:1:248:1893:25c8:1946"
```
Bun supports three backends for DNS resolution:
- `c-ares` - This is the default on Linux, and it uses the [c-ares](https://c-ares.org/) library to perform DNS resolution.
- `system` - Uses the system's non-blocking DNS resolver, if available. Otherwise, falls back to `getaddrinfo`. This is the default on macOS, and the same as `getaddrinfo` on Linux.
- `getaddrinfo` - Uses the POSIX standard `getaddrinfo` function, which may cause performance issues under concurrent load.

You can choose a particular backend by specifying `backend` as an option.
```ts
import { dns } from "bun";
const [{ address, ttl }] = await dns.lookup("example.com", {
  backend: "c-ares"
});
console.log(address); // "93.184.216.34"
console.log(ttl); // 21237
```
Note: the `ttl` property is only accurate when the `backend` is c-ares. Otherwise, `ttl` will be `0`.
This was added in Bun v0.5.0. -->
?follow=1'>public</a>/<a href='/ansg191/spotify/log/public/images?follow=1'>images</a> (<a href='/ansg191/spotify/log/public/images'>unfollow</a>)</div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/ansg191/spotify/log/public/images?showmsg=1&amp;follow=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
<tr><td><span title='2021-01-25 19:54:35 -0800'>2021-01-25</span></td><td><a href='/ansg191/spotify/commit/public/views/tracks.ejs?id=481fcb1975047f5374a5c28abac65ae80e772126&amp;follow=1'>Adds new search bar to playlists for future use</a></td><td><img src='//www.gravatar.com/avatar/eb18209eeadb99f89ad2ce6cf762be48?s=13&amp;d=retro' width='13' height='13' alt='Gravatar' /> Anshul Gupta
</td><td>2</td><td><span class='deletions'>-28</span>/<span class='insertions'>+129</span></td></tr>
<tr><td><span title='2021-01-25 19:53:01 -0800'>2021-01-25</span></td><td><a href='/ansg191/spotify/commit/styles/styles.css?id=4d7e4ca67681ae4f1b7555e0b90c9064f7e57b28&amp;follow=1'>Adds podium to track page to visualize ML results</a></td><td><img src='//www.gravatar.com/avatar/eb18209eeadb99f89ad2ce6cf762be48?s=13&amp;d=retro' width='13' height='13' alt='Gravatar' /> Anshul Gupta
</td><td>4</td><td><span class='deletions'>-13</span>/<span class='insertions'>+103</span></td></tr>
<tr><td><span title='2021-01-25 18:47:51 -0800'>2021-01-25</span></td><td><a href='/ansg191/spotify/commit/routers/genre.ts?id=b69c6028b70667b9d6fb50d9ddd73730980fd645&amp;follow=1'>Refactor genre.ts to simplify process</a></td><td><img src='//www.gravatar.com/avatar/eb18209eeadb99f89ad2ce6cf762be48?s=13&amp;d=retro' width='13' height='13' alt='Gravatar' /> Anshul Gupta
</td><td>1</td><td><span class='deletions'>-89</span>/<span class='insertions'>+186</span></td></tr>
<tr><td><span title='2021-01-25 18:21:37 -0800'>2021-01-25</span></td><td><a href='/ansg191/spotify/commit/routers/pages.ts?id=45304a784f4942f96fd43624f563673bd5e1c886&amp;follow=1'>Typing</a></td><td><img src='//www.gravatar.com/avatar/eb18209eeadb99f89ad2ce6cf762be48?s=13&amp;d=retro' width='13' height='13' alt='Gravatar' /> Anshul Gupta
</td><td>2</td><td><span class='deletions'>-5</span>/<span class='insertions'>+57</span></td></tr>