Understanding Nmap SYN Scan Output
When you run an Nmap SYN scan, the output will typically display the following information for each scanned port:
PORT STATE SERVICE
22/tcp open ssh
80/tcp open http
443/tcp open https
Let's break down the different components of this output:
Port
The first column shows the port number and protocol (e.g., 22/tcp, 80/tcp, 443/tcp). This indicates the specific port and transport protocol being scanned.
State
The second column, "STATE", indicates the status of the port. The most common states are:
open
: The port is accepting connections.
closed
: The port is not accepting connections.
filtered
: The port is being filtered by a firewall, IDS, or other network device, and Nmap cannot determine whether it is open or closed.
Service
The third column, "SERVICE", shows the name of the service running on the open port, as determined by Nmap's service detection capabilities. This information can be useful for identifying the type of application or service running on the target system.
Here's an example of how the Nmap SYN scan output might look:
nmap -sS 192.168.1.100
Starting Nmap scan on 192.168.1.100
PORT STATE SERVICE
22/tcp open ssh
80/tcp open http
443/tcp open https
In this example, the Nmap SYN scan has identified three open ports on the target system:
- Port 22/tcp is running the SSH service.
- Port 80/tcp is running the HTTP service.
- Port 443/tcp is running the HTTPS service.
By understanding the Nmap SYN scan output, you can gain valuable insights into the target system's open ports and the services running on those ports. This information can be used to identify potential attack vectors and plan further security assessments or penetration testing activities.