Online TCP Port Scan

Check for insecure network services that could be accessible through the Internet using our port scanner.

  • See whether your firewall is set up appropriately and if the servers have any unneeded TCP ports open
  • Identify quickly obsolete service versions and required updates
  • Get automated reports to share within your team in a continuous security approach
  • Automated online SaaS port scanner

Port scanner features

Attackers scan targets regularly, taking an inventory of all available ports, knowing that every open port is a potential for compromise. We have developed this port scanner to avoid data loss and budget for cyber attack mitigation to make your work easier and faster.


Create a scan target and verify it.



Configure the system and application credentials.


CI Integration

Create a webhook and start a scan via the CI Integration.


Get notifications

Integrate chat notification (Slack, Mattermost, Hangouts, and more).


Download the report

Get reports with remediations advice for every vulnerability found, risk levels, and specific solutions for each one of those.



Port scanning tool benefits

  • Scan for open ports and detect with ease services running behind them.
  • Quickly share security reports with your team members in PDF, XML/JSON, or CSV formats.
  • Check for other flaws listed in the OWASP Top 10 2021.


Sample TCP port scan with Nmap reports

Download a sample result from a TCP Port Scan using Nmap and check how our software can save your time and eliminate tedious manual testing labor.

Vulnerability overview

The report begins with a brief description of the results and risk ratings, providing you with a valuable overview of the risk levels and the number of findings.

Helpful suggestions

Each discovery includes a risk assessment and recommendations to help you get a head start on resolving the problems.

Sorted according to the severity of the threat

Starting with the most significant danger detected, vulnerabilities are ranked according to their risk assessment. This saves you time and effort by eliminating manual labor.

Continuous Security

More reasons for continuous port testing

Automated Pentesting

Perform regular black box pentests on your web assets and spend less on infrequent manual penetration tests.

Cybersecurity Risk Reduction

Benchmark your next release against OWASP Top 10 and other known vulnerabilities.

Schedule Scans

Match vulnerability scanning to your agile dev cycle.

Ensure Compliance

Scan every new release before deployment and ensure compliance with regulations and standards (HIPAA, GDPR, ISO, and many more).

Faster Vulnerability Detection

Detect and mitigate vulnerabilities quicker by scanning your web assets regularly.

Integrated Dev Pipeline

Integrate vulnerability scanning into your dev process and environment and shift security left.


Port Scan

What is port scanning?

Port is a kind of door on the server that can be used to connect to a specific service. For a web server, port 80 and port 443, which are for HTTP/HTTPS, are most likely open to serve the website to the users. Other ports should be closed if they are not needed for any service. The port scanner tests the webserver with an SYN scan for a wide range of open ports and reports them back. If there are any other open ports except port 80 and port 443, the firewall should block them if they are not needed.

Unneeded open ports on the webserver open a large attack surface to a malicious user. This can be used to find unmaintained and possibly vulnerable network services that can be targeted.

What protocols are used for port scanning?

TCP (transmission control protocol) and UDP (user datagram protocol) are the most often used protocols for port scanning (user datagram protocol). They are both internet data transfer systems; however, their mechanics are distinct.

UDP is connectionless and unstable, whereas TCP is a reliable, two-way connection-based data transfer that relies on the destination’s status to complete a successful send. Data sent through the UDP protocol is provided without regard for the destination; as a result, there is no guarantee that the data will reach its intended destination.

There are various alternative strategies for doing port scans using these two protocols.

How do hackers use port scanning as an attack method?

According to the SANS Institute, one of the most common strategies attackers employ when looking for a vulnerable server to hack is port scanning.

When attacking networks, fraudsters frequently utilize port scanning as a preparatory step. They utilize the port scan to assess various firms’ security levels and decide who has a good firewall and a weak server or network. Several TCP protocol approaches allow attackers to hide their network location and execute port scans using “decoy traffic” without disclosing their network address to the victim.

Get a quick security report for your website for free now

We are analyzing
Scanning target
Scan status: In progress
Scan target:
Date: 30/11/2023
Crashtest Security Suite will be checking for:
Information disclosure Known vulnerabilities SSL misconfiguration Open ports
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