---
description: Use consistent example values in documentation.
title: Example values
image: https://developers.cloudflare.com/og-docs.png
---

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# Example values

Last updated Aug 24, 2026|Copy as Markdown|[View as Markdown](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/style-guide/style-and-grammar/formatting/example-values/index.md)|[Agent setup](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/agent-setup/)

## 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)

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