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If you are hosting your web applications on a managed or shared server, then you don’t have to worry about it.

However, for VPS or dedicated, you must consider doing all it takes to secure your server. Having unwanted ports opened is a lousy idea; an attacker can take advantage of it in many ways.

In this post, we discuss the best port scanners you can start using today to check for open ports in your ecosystem.

Note: if you’re running a port scan on your website DNS and if that is behind the cloud proxy like Cloudflare or SUCURI, then it may not give you accurate information.

Online Port Scanners

Here are online port scanners, which will help you find out what ports are opened so you can review and block them if not needed.

TCP Port Scan with Nmap

Pentest Tools check open ports using NMAP on the targeted host. In the light version, there is some limitation, as it scans for up to 100 top ports, single IP only.

However, if you go for a full scan, then you can scan all 65,535 ports to detect OS and traceroute. And if you need to export the scan results, then you can do so.

Try TCP Port Scan with Nmap

Siterelic Port Scanner API

Alternatively, you can try Siterelic Port Scanner API. It lists all the open ports on your website or IP within seconds.

Plans for Siterelic API start at 10K API calls for just $10 a month.

Try Siterelic


IPv6Scanner is a personal project of Javier Yanez, available to use for free to scan the ports against IPV4 or IPV6 addresses.

Try IPv6Scanner

Port Scanner by Hacker Target

Hacker Target lets you perform a quick scan with most standard following ten ports with a hosted NMAP port scanner.

  • FTP
  • SSH
  • SMTP
  • HTTP
  • RDP
  • POP3
  • IMAP
  • SMB
  • Telnet

They also have a premium version that offers the following.

  • Scan all ports
  • Scan on subnet
  • Schedule to run a daily scan and get notified of any changes
Try Port Scanner by Hacker Target

Port Scanner by DNS Tools

Quickly scan for some of the standard ports like FTP, SMTP, DNS, Finger, POP3, SFTP, RPC, IRC, IMAP, VNC, etc. through DNS Tools.

Try Port Scanner by DNS Tools


By using WhatIsMyIp you can test for an individual port or by a package is free. However, for more like scanning the range of custom, you need to subscribe to their service.

The package is nothing but a group of relevant ports.

  • Basic – HTTP, POP3, MySQL, etc
  • Web – cPanel, DNS, WHOIS, TrelliSoft, TFTP, etc
  • Games – Call of Duty, Second Life, Xbox, Minecraft, etc
  • Malicious – Metaspoilt, Bagle virus, W32, etc
Try WhatIsMyIp


I hope the above tools help to find the opened ports on your domain or IP. Most of the web tools will have some limitations, as you can notice, Nmap is an essential tool to scan the ports.

You can trust Geekflare

Imagine the satisfaction of finding just what you wanted and needed. We understand that feeling, too, so we go to great lengths to evaluate free and paid trials, subscribe to the premium plan if required, have a cup of coffee, and test the software and tools! While we may receive affiliate commissions from purchasing links on our site, our primary focus remains steadfast: delivering unbiased editorial insights, meticulously crafted product tables, and in-depth reviews. To learn more about our expert unbiased reviews from your perspective, check out how we test.

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  • Chandan Kumar
    Chandan Kumar is a seasoned technology enthusiast and entrepreneur passionate about empowering businesses and individuals globally. As the founder of Geekflare, a leading technology publication, Chandan has spearheaded the development…

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