# Host Discovery

## NMAP Host discovery

```
nmap -sn -PR 192.168.18.110
```

{% hint style="info" %}
-sn disables port scan

-PR arp scan on host
{% endhint %}

other nmap scans to discover host.

```
sudo nmap -sn -PU 192.168.18.110   //UDP ping scan
nmap -sn -PE 192.168.18.110   //ICMP ping scan. Normal ping scan
nmap -sn -PE 192.168.18.1-255   //check live hosts on network range
nmap -sn -PM 192.168.18.1-255    //Mask Ping scan (use if ICMP is blocked)
nmap -sn -PP 192.168.18.1-255    //ICMP timestamp scan
nmap -sn -PS 192.168.18.1-255    //tcp syn ping scan
nmap -sn -PO 192.168.18.1-255     //IP protocol scan.use different protocols to test the connectivity
```


---

# 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://notes.cavementech.com/pentesting-quick-reference/host-discovery.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.