There is no cause for alarm whether the web apps are hosted on a managed or distributed server. But whether you have a virtual private server (VPS) or a dedicated server, you need to take extra precautions to keep it safe. This article lists down some of the best online port scanners for your convenience.
Leaving unused ports exposed is a bad idea for a number of reasons that an attacker can take advantage of.
7 Best Online Port Scanners for You
Here are several no-cost online resources that can help you audit your network’s open ports and shut any that aren’t required for proper operation.
(A DNS port scan may return inaccurate results if performed on a website that is behind a cloud proxy like Cloudflare or SUCURI).
NMAP is used by Pentest Tools to scan for available ports on the target host. The top 100 ports and an individual IP address are all you get with the free version. A comprehensive scan, on the other hand, allows you to discover the OS and traceroute in addition to scanning all 65,535 ports. The scan results can also be exported for further use.
As an alternative, you can utilize the Geekflare Port Scanner API, which, in a matter of seconds, will provide a complete list of all the open ports on your domain or IP address.
The paid plan is great, but the free one is even better because it provides you with 3000 API calls at no cost. If you wish to upgrade, you can get 10,000 API calls each month for just $5 a month.
Developed by Javier Yanez himself, this free program can be used to scan IPV4 and IPV6 port numbers.
Hacker Target provides a hosted version of the popular NMAP port scanner, allowing for a quick search of the 10 most prevalent ports.
Also, they provide a paid version with the following additions:
- Verify each input
- Analyse the subnet
- Set up a daily check and get updates on any changes
Fast port scanning for protocols including FTP, SMTP, DNS, Finger, POP3, SFTP, RPC, IRC, IMAP, VNC, and others is possible with DNS Tools.
It doesn’t cost anything to check out only one port or one package. You need to sign up for their service if you want to make full advantage of its capabilities, including the ability to scan a given range. The package only compiles the necessary ports into one convenient bundle.
- 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
Similarly, there is a port scanner that looks for common ports which is this one.
I’m crossing my fingers that the aforementioned resources help you discover the IP or domain addresses with open ports. As most web-based apps have usage restrictions, I suggest utilising one of the programs provided if you require a Online Port Scanners for heavy duty use.