> ## Documentation Index
> Fetch the complete documentation index at: https://docs.abusix.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Executing dig, host, and nslookup queries

## **Query Basics**

* When querying for an [IPv4](https://abusix.com/glossary/internet-protocol-version-4/) address, it must be in reverse order. e.g., to check if [IP](https://abusix.com/glossary/internet-protocol-address/) address 1.2.3.4 is present on a [DNS](https://abusix.com/glossary/domain-name-system/) list, the octets must be reversed, and you would query for *4.3.2.1.\<list>*.
* For [IPv6](https://abusix.com/glossary/internet-protocol-version-6/) addresses, these must be queried in reverse nibble format. e.g., to check if the [IPv6](https://abusix.com/glossary/internet-protocol-version-6/) address 2001:db8::1 is present on a [DNS](https://abusix.com/glossary/domain-name-system/) list, you would query for “*1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.\<list>*.”
* For domains, these are appended to the query, e.g., to check if domain [example.com](http://example.com) is present, you would query for “[*example.com*](http://example.com)*.\<list>.*”

If a lookup returns an address in *127.0.0.0/8*, then the entry is present on that list; if nothing is returned *(NXDOMAIN)*, it is not on the list.

**Examples:**

To send a test query for an [IP](https://abusix.com/glossary/internet-protocol-address/) address to the test point, run one of the following commands:

```
# UNIX systems

$ dig +short 2.0.0.127.<APIKEY>.combined.mail.abusix.zone.
127.0.0.2

# or

$ host -t A 2.0.0.127.<APIKEY>.combined.mail.abusix.zone.
2.0.0.127.APIKEY.combined.mail.abusix.zone. has address 127.0.0.2
```

```
# Windows

> nslookup 2.0.0.127.<APIKEY>.combined.mail.abusix.zone.
Server:        1.1.1.1
Address:    1.1.1.1#53

Non-authoritative answer:
Name:    2.0.0.127.<APIKEY>.combined.mail.abusix.zone
Address: 127.0.0.2
```

Replace \<APIKEY> with “**Your API key”** from your account in [app.abusix.com](http://app.abusix.com).

If you do not receive *“127.0.0.2”*, then something is wrong. Check that your API key is entered correctly (it should be exactly 32 characters).

You may replace “combined” with any of the other Production Zones

**Example:**

To send a test query for a domain to the domain test point, run one of the following commands:

```
$ dig +short baddomain.org.<APIKEY>.dblack.mail.abusix.zone
127.0.1.2

$ dig +short okdomain.org.<APIKEY>.dblack.mail.abusix.zone
$
```

Replace \<APIKEY> with “**Your API key”** from your account in [app.abusix.com](http://app.abusix.com).

If you do not receive *“127.0.0.2”*, then something is wrong. Check that your API key is entered correctly (it should be exactly 32 characters).

## **Learn more about Guardian Mail**

Having trouble with your set up or a technical issue? Get in touch with our team of Abusix experts.

Click the chat button at the bottom and send us your questions. Alternatively, you can email us at [support@abusix.com](mailto:support@abusix.com)

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