Day-7: Nmap -- Hacker's Favourite Scanning Tool!

#cybersecurity #security #infosec #blogaday

Day-7: I started my day watching Dude perfect's documentary and ended it learning Nmap and about its scan types! Also, In between, I bought pentesterlab pro access (3mths - Student access).

Note: I won't be writing more in deep, but my notes! And will be providing all the links/resources (Don't forget to check-out the resource section) from where I learned so that you can refer to that resource and learn more! Thanks!❤️

What is Nmap?

Nmap stands for Network Mapped (Nmap) and is a network scanning and host detection tool that is very useful during several steps of penetration testing.
Nmap is open source and can be used to:
- Detect the live host on the network (host discovery)
- Detect the open ports on the host (port discovery or enumeration)
- Detect the software and the version to the respective port (service discovery)
- Detect the operating system, hardware address, and the software version
- Detect the vulnerability and security holes (Nmap scripts)

Nmap Syntax:

nmap [scan type] [options] [target specification]

Nmap Scan types:

TCP SCAN
UDP SCAN
SYN SCAN
ACK SCAN
FIN SCAN
NULL SCAN
XMAS SCAN
RPC SCAN
IDLE SCAN

Using Nmap help:

The best way to get used to nmap and its flags is using nmap -h, run this command in the terminal and will give you the following results: and one more screenshot, but it is creating a mess so wont post it! Try yourself and explore the world of nmap! Happy Scanning!

Port states recognized by Nmap?

Six port states recognized by Nmap are:
- Open
- Closed
- Filtered
- Unfiltered
- Openfiltered
- Closedfiltered

Resources:

Medium Blogs: https://medium.com/bugbountywriteup/intro-to-nmap-192c1796bb39
Nmap Installation: https://nmap.org/download.html
HackerSploit Nmap Tutorial: YouTube
Port Scanning basics: https://nmap.org/book/man-port-scanning-basics.html
Scan Types: Edureka

Contact:

Got doubts? Contact me on Twitter.
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