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