firewallruletest.com

What It Is

Firewall Rule Test is an online firewall rule testing tool aimed at network and security operations teams. The page displays the visitor’s IP address as well as the source IP of the test server. After the user enters a publicly routable target host, the server can initiate a connection test to that target, simulating what happens when an Internet user tries to access a given port on the host.

Core Features and Technical Implementation

Its core function is TCP service port testing. The page offers common port options, including FTP 21, SSH 22, Telnet 23, SMTP 25, HTTP 80, POP3 110, NetBIOS 139, HTTPS 443, Microsoft-DS 445, and Remote Desktop 3389. It also supports custom port numbers. The page explicitly states that it uses Nmap under the hood to attempt port connections, with the parameters “-n -sT -p -Pn”. This means it mainly performs TCP connect-style reachability checks and skips host discovery.

Another feature is ICMP Ping, which sends 5 ICMP echo requests to the target. The underlying parameter is “ping -c 5”. If the target is configured to respond to ICMP, this can be used to determine whether the target is online. The page also emphasizes that the target must be routable, meaning it is primarily intended for public IP addresses or routable hosts.

Pricing, Openness, and Integrations

The captured text does not mention registration, pricing, plans, or payment methods, and the page appears to be directly usable. There is also no visible API, SDK, webhook, account system, history, or report export feature. Whether it is open source or supports self-hosting is not disclosed. In terms of ecosystem, the page only shows links to related tools such as IP Network Calculator and Cisco Password Decoder, making it more of a simple toolkit.

Pros, Cons, and Suitable Users

Its main advantage is that it is very straightforward to use: there is no need to install Nmap or configure a test node, and users can verify from the perspective of a third-party public Internet server whether firewall rules, security groups, or port forwarding are working. It also discloses the underlying command parameters, which is a plus for transparency. The downside is that its scope is clearly limited: it only supports basic TCP and ICMP checks, and lacks batch tasks, automation interfaces, result retention, access control, and enterprise support details.

It is suitable for developers, system administrators, and security operations teams who need to quickly confirm during troubleshooting whether ports such as SSH, HTTP, HTTPS, and RDP are reachable. If you need continuous monitoring, compliance reports, or internal network scanning, you should still use a self-hosted Nmap setup, a monitoring system, or a more complete network diagnostics platform.

Access from China

The captured text does not provide information about access from mainland China, network stability, or payment, so china_access can only be marked as unknown. If access is unstable, alternatives include running nmap/ping locally, using domestic webmaster tools, or using cloud provider security group diagnostic tools.