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?

Discovering hostnames pointing to the same IP address

Web servers return different content depending on the hostname used in the HTTP request host header. By discovering new hostnames, penetration testers can access new target web applications that were inaccessible using the server's IP, thus expanding the attack surface.

This recipe shows how to discover new hostnames pointing to the same IP address.

How to do it...

To discover hostnames pointing to the same IP address, use the following Nmap command:
```
$nmap -sn --script hostmap-* <target>
```
The hostmap-crtsh script returns all records that match the given IP address by querying an external service from https://crt.sh. There were other hostmap scripts that at the moment are broken because of changes in the API, but are expected to work again in the future. If there are records on the public database, they will be included in the results:
```
Host script results:
| hostmap-crtsh: 
|   subdomains...
```