---
title: "Inspect a Teredo IPv6 address"
description: "Expand an IPv6 address and reveal embedded Teredo connection details."
---

> Documentation Index
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# Inspect a Teredo IPv6 address

import RecipeInstallButton from "../../../components/RecipeInstallButton.astro";

## What it can do

- Show longhand and shorthand IPv6 forms
- Detect a Teredo transition address
- Extract the embedded server and client IPv4 addresses
- Decode UDP port and flag metadata

## Demonstration

Input:

```text
2001:0000:4136:e378:8000:63bf:3fff:fdd2
```

Key result:

```text
Teredo
server: 65.54.227.120
client: 192.0.2.45
UDP port: 40000
```

This is useful during packet review or incident triage because the apparent IPv6 address carries IPv4 connection context.

Source: https://help.serialize.dev/recipes/inspect-teredo-ipv6/index.mdx