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Port Scanner Tools for Advanced Scanning by Network Administrators
Most Popular Port Scanners in CyberSecurity

What is a port scanner?

A port scanner (also known as network scanner), is a software application used in cybersecurity and IT industries to scan networks, hosts, or IP addresses looking for open ports, closed ports, or filtered ports.

Port scanners are among the top cybersecurity tools used by researchers, security teams, and ethical hackers to diagnose network issues, audit networks, run penetration testing, and perform vulnerability scanning tasks.

How do port scanners work?

All port scanners operate in a very basic way:

Send a request to a remote or local TCP or UDP port
Wait for the response
Record the response from the host as 'open', 'filtered', or 'closed'
A popular use case of port scanning is to scan for 3306 port for example, after you installed and started MySQL server to see if it's showing as 'open'. In plain English, a port scanner works by sending network packets and waiting for a response.

Port Scanner Tools
TCP Port Scanner
Nmap
Netcat
Port Authority
Advanced Port Scanner
Network Scanner by MiTeC
PortQryUI
NetScanTools
Angry IP Scanner
MASSCAN

Scan thousands of ports in a second! Let’s see how network admins can do this.

How do you know the available ports on a particular IP or IP range on your network?

Well, if you are thinking about checking manually, it will take a lot of time. Better to use tools to scan the ports faster. Previously, I talked about how to scan ports on Internet-facing IP and received feedback to cover tools to scan the intranet network.

There are multiple methods of port scanning – TCP, FIN, ICMP, Idle, SYN, UDP, ACK, Windows, etc. Not every scanner will have them all, so choose what fits your requirement.

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