You're reading from Nmap Network Exploration and Security Auditing Cookbook, Third Edition Network discovery and security scanning at your fingertips

Product type Paperback

Published in Sep 2021

Publisher Packt

ISBN-13 9781838649357

Length 436 pages

Edition 3rd Edition

Languages

C++

Tools

Nmap

Concepts

Network Security

Author (1):

Paulino Calderon

View More author details

Table of Contents (22) Chapters

Preface

1. Chapter 1: Nmap Fundamentals

2. Chapter 2: Getting Familiar with Nmap's Family FREE CHAPTER

3. Chapter 3: Network Scanning

4. Chapter 4: Reconnaissance Tasks

5. Chapter 5: Scanning Web Servers

6. Chapter 6: Scanning Databases

7. Chapter 7: Scanning Mail Servers

8. Chapter 8: Scanning Windows Systems

9. Chapter 9: Scanning ICS/SCADA Systems

10. Chapter 10: Scanning Mainframes

11. Chapter 11: Optimizing Scans

12. Chapter 12: Generating Scan Reports

13. Chapter 13: Writing Your Own NSE Scripts

14. Chapter 14: Exploiting Vulnerabilities with the Nmap Scripting Engine

15. Other Books You May Enjoy

Appendix A: HTTP, HTTP Pipelining, and Web Crawling Configuration Options

HTTP user agent

1. Appendix Β: Brute-Force Password Auditing Options

Brute modes

2. Appendix C: NSE Debugging

3. Appendix D: Additional Output Options

4. Appendix Ε: Introduction to Lua

5. Appendix F: References and Additional Reading

Why subscribe?

Finding online hosts

Finding online hosts in networks or on the internet is a common task among penetration testers and system administrators. Nmap offers better host detection as it sends more probes than the ICMP echo request sent by the traditional ping utility.

This recipe describes how to determine whether a host is online with Nmap.

How to do it...

Launch a ping scan against a target to determine whether it is online using the following command:

#nmap -sn <target>

The results will include all hosts that responded to any of the packets sent by Nmap during the ping scan, that is, the active machines on the target network segment or the internet. Nmap takes as a target any option not recognized and it supports IPv4/IPv6 addresses, hostnames, and network ranges that can be defined using wildcards and Classless Inter-Domain Routing (CIDR) notation. For example, to scan the local network, 192.168.0.1/24, you can run the following command: