---
title: "Applying a static IP"
url: "https://maker.wiznet.io/forum/10582"
markdown_url: "https://maker.wiznet.io/forum/10582/md"
type: "Forum topic"
category: "Ethernet Chips"
author: "jdcowpland"
created: "2014-10-09T09:17:22+09:00"
last_activity: "2017-05-04T08:34:05+09:00"
language: "en"
views: 2663
replies: 2
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# Applying a static IP

## Question

Asked by jdcowpland on 2014-10-09 in Ethernet Chips.

I have my wiznet chip up and running, and have a static IP assigned to it. It all seems to work no problem with the network. Question: When I assign the static IP, what is the best way to make sure that the IP isn’t already in use on the network?

## Replies

### Reply 1 by alexpescaru, 2014-10-11

Maybe you have some embedded systems behind a NAT or a private local network with IPs allocated by hand or automatically generated by the embedded systems.
Question is valid.
How can you realize that the current W5500’s IP is used by other machine too?
How will behave the W5500 when you set inside, by mistake, an IP already on the network?
How can you realize, by reading W5500 registers, that the local IP is already used on the network?

### Reply 2 by alexpescaru, 2014-10-13

Thank you!
All clear now for me.

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Source: https://maker.wiznet.io/forum/10582