Asked by: Ibor Hinspeter
technology and computing email

What tools could you use to perform port scanning?

Last Updated: 10th February, 2020

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Let's explore the top five most popular port scanners tools used in the infosec field.
  1. Nmap. Nmap stands for "Network Mapper", it is the most popular network discovery and port scanner in the history.
  2. Unicornscan. Unicornscan is the second most popular free port scanner after Nmap.
  3. Angry IP Scan.
  4. Netcat.
  5. Zenmap.

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Also know, which of the following tools can perform a port scan?

8 Port Scanner Tools for Network Administrator

  • 1TCP Port Scanner.
  • 2Nmap.
  • 3Netcat.
  • 4Port Authority.
  • 5Advanced Port Scanner.
  • 6Network Scanner by MiTeC.
  • 7PortQryUI.
  • 8NetScanTools.

Subsequently, question is, how does port scanner work? A port scanner is an application designed to probe a server or host for open ports. Such an application may be used by administrators to verify security policies of their networks and by attackers to identify network services running on a host and exploit vulnerabilities.

Keeping this in consideration, how do I open ports to scan?

PortQry.exe allows you to scan open ports on a local or remote host. Once you have downloaded and extracted portqry.exe to your machine, open a command prompt, and type portqry.exe followed by a given parameter from the folder that contains the executable.

Which method of port scanning is the most popular?

Common Basic Port Scanning Techniques

  • PING SCAN. Ping Scans are used to sweep a whole network block or a single target to check to see if the target is alive.
  • TCP Half-Open. This is probably the most common type of port scan.
  • TCP CONNECT.
  • UDP.
  • STEALTH SCANNING – NULL, FIN, X-MAS.

Related Question Answers

Eileen Vallakh

Professional

Is port scanning illegal?

In the U.S., no federal law exists to ban port scanning. However – while not explicitly illegalport and vulnerability scanning without permission can get you into trouble: Civil lawsuits – The owner of a scanned system can sue the person who performed the scan.

Rym Abrio

Professional

How many ports are there in system?

You can have a total of 65,535 TCP Ports and another 65,535 UDP ports. When a program on your computer sends or receives data over the Internet it sends that data to an ip address and a specific port on the remote computer, and receives the data on a usually random port on its own computer.

Gumaro Dierichen

Professional

What ports are open?

Which Ports Are Usually Open By Default?
  • 20 – FTP (File Transfer Protocol)
  • 22 – Secure Shell (SSH)
  • 25 – Simple Mail Transfer Protocol (SMTP)
  • 53 – Domain Name System (DNS)
  • 80 – Hypertext Transfer Protocol (HTTP)
  • 110 – Post Office Protocol (POP3)
  • 143 – Internet Message Access Protocol (IMAP)
  • 443 – HTTP Secure (HTTPS)

Mounim Luckens

Explainer

How do I stop port scanning?

In order to block port scans, you need to enable filters 7000 to 7004 and 7016. Please ensure that you read the filter descriptions as some of them have warnings attached. The following filters detect and/or block port scans and host sweeps.

Xinhua Erhart

Explainer

Is Nmap a port scanner?

Otherwise Nmap will use the port it uses by default for TCP pings (80). IP protocol scan allows you to determine which IP protocols (TCP, ICMP, IGMP, etc.) are supported by target machines. This isn't technically a port scan, since it cycles through IP protocol numbers rather than TCP or UDP port numbers.

Maj Kinzler

Explainer

What is Unicornscan?

Unicornscan is an attempt at a User-land Distributed TCP/IP stack for information gathering and correlation. It is intended to provide a researcher a superior interface for introducing a stimulus into and measuring a response from a TCP/IP enabled device or network.

Suely Azorin

Pundit

What is the best IP scanner?

But the best scanners are the ones that you run on your own devices since they allow more flexibility in the process.
  • Nmap.
  • Advanced IP Scanner.
  • Angry IP Scanner.
  • Free IP Scanner by Eusing.
  • NetCat.
  • LanSweeper IP Scanner.
  • MyLanViewer Network/IP Scanner.
  • Slitheris Network Discovery.

Nimia Rivela

Pundit

How do I ping a port?

In the command prompt window, type "telnet" followed by a space, then an IP address or domain name followed by another space, and then the port number. For example, to check whether you can connect to port 80 on www.example.com, you type "telnet www.example.com 80" in the command prompt window.

Salca Tamcke

Pundit

How do I scan a port to open with nmap?

To get started, download and install Nmap from the nmap.org website and then launch a command prompt. Typing nmap [hostname] or nmap [ip_address] will initiate a default scan. A default scan uses 1000 common TCP ports and has Host Discovery enabled. Host Discovery performs a check to see if the host is online.

Majdouline Habibullin

Pundit

How do I check my ports?

How to find your port number
  1. Start your command prompt.
  2. Type ipconfig.
  3. Next type netstat -a for a list of your various port numbers.

Ivory Nicodemo

Teacher

What is port 443 normally used for?

Port 443 is the standard port for all secured HTTP traffic, meaning it's absolutely essential for most modern web activity. Encryption is necessary to protect information, as it makes its way between your computer and a web server.

Julieth Cottet

Teacher

What is my external IP address?

To simplify it, an external IP address is how devices around the internet find you. It's like of like calling a person's company when you're trying to reach them. The external IP address, in this case, would be the company's phone number.

Chaoyang Sabol

Teacher

How can I see what ports are open on my IP?

How to Check Open TCP/IP Ports in Windows
  1. Whenever an application wants to make itself accessible over the network, it claims a TCP/IP port, which means that port can't be used by anything else.
  2. At the Command Prompt, type the following text and then hit Enter: netstat -ab.
  3. Option Two: View Port Use Along with Process Identifiers.

Alyssa Twarog

Reviewer

What is a filtered port?

Filtered means that a firewall, filter, or other network obstacle is blocking the port so that Nmap cannot tell whether it is open or closed. Closed ports have no application listening on them, though they could open up at any time.

Abdellah Bicente

Reviewer

What ports do hackers use?

Commonly Hacked Ports
  • TCP port 21 — FTP (File Transfer Protocol)
  • TCP port 22 — SSH (Secure Shell)
  • TCP port 23 — Telnet.
  • TCP port 25 — SMTP (Simple Mail Transfer Protocol)
  • TCP and UDP port 53 — DNS (Domain Name System)
  • TCP port 443 — HTTP (Hypertext Transport Protocol) and HTTPS (HTTP over SSL)

Abdulrahman Ashe

Reviewer

What is port scanning used for?

Port Scanning is the name for the technique used to identify open ports and services available on a network host. It is sometimes utilized by security technicians to audit computers for vulnerabilities, however, it is also used by hackers to target victims.

Kathia Ojo

Reviewer

What can hackers do with open ports?

Malicious ("black hat") hackers (or crackers) commonly use port scanning software to find which ports are "open" (unfiltered) in a given computer, and whether or not an actual service is listening on that port. They can then attempt to exploit potential vulnerabilities in any services they find.

Neelam Sistere

Supporter

Why are open ports bad?

An "open" port is a port that is set up to accept an incoming TCP connection. To answer your question: The reason it is bad to have open ports on your computer is because these ports can easily be discovered, and once discovered these ports are now susceptible to vulnerabilities of the listening applications.

Arume Car

Supporter

What does Port scan detected?

A port scan is a method for determining which ports on a network are open. As ports on a computer are the place where information is sent and received, port scanning is analogous to knocking on doors to see if someone is home. It is also valuable for testing network security and the strength of the system's firewall.