# DNS Server IP Address

The default IP addresses of GreenNode for use in DHCP options sets of **HCM Region** are:

* <mark style="color:blue;">**10.166.12.196**</mark>
* <mark style="color:blue;">**10.166.12.197**</mark>

The default IP addresses of GreenNode for use in DHCP options sets of **HAN Region** are:

* <mark style="color:blue;">**10.236.10.196**</mark>
* <mark style="color:blue;">**10.236.10.197**</mark>

This ensures that you can access the basic services of GreenNode. You can click "**Set to optimize**" to specify DNS server IP addresses to meet your needs.

{% hint style="info" %}
**Important**

Before customizing the DNS server IP addresses, note the following:

* The system is automatically assigning the GreenNode IPs which listed above. If you remove these addresses, you may not be able to use the basic services of GreenNode.
* VNG allows you to set up to a maximum of 4 DNS server IP addresses in one DHCP options set.
  {% endhint %}


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.vngcloud.vn/vng-cloud-document/vserver/compute-hcm03-1a/vpc/dhcp-options-sets/dns-server-ip-address.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.