---
title: Example values
description: Use consistent example values in documentation.
image: https://developers.cloudflare.com/cf-twitter-card.png
---

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# Example values

## DNS Domains

As described in [RFC 2606 ↗](https://datatracker.ietf.org/doc/html/rfc2606) and [RFC 6761 ↗](https://datatracker.ietf.org/doc/html/rfc6761), a number of domains such as `example.com` and `example.org` are maintained for documentation purposes. Sometimes you also need to differentiate between a customer domain and your own application domain, so Cloudflare has also registered some domains for you to use.

Examples:

* `example.com`
* `example.org`
* `myappexample.com`
* `mycustomerexample.com`

IANA also maintains more example domains in their [domain names documentation ↗](https://www.iana.org/domains/reserved).

## IPv4 ranges

According to the Internet Engineering Task Force (IETF), there are specific [IPv4 ranges used for documentation ↗](https://datatracker.ietf.org/doc/html/rfc5737):

Examples:

* `192.0.2.0/24`
* `198.51.100.0/24`
* `203.0.113.0/24`

These IP addresses are reserved and will not take anyone to live origins.

## Autonomous System Numbers (ASNs)

According to the Internet Assigned Numbers Authority (IANA), there are specific [ASN ranges reserved for documentation ↗](https://datatracker.ietf.org/doc/html/rfc5398):

* `64496-64511` (16-bit ASN range)
* `65536-65551` (32-bit ASN range)

```json
{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"/directory/","name":"Directory"}},{"@type":"ListItem","position":2,"item":{"@id":"/style-guide/","name":"Style Guide"}},{"@type":"ListItem","position":3,"item":{"@id":"/style-guide/formatting/","name":"Formatting"}},{"@type":"ListItem","position":4,"item":{"@id":"/style-guide/formatting/example-values/","name":"Example values"}}]}
```