Port Checker
Check authorized ports on this server only
Ports are checked against this server's own hostname — you can only probe ports that are whitelisted below, never arbitrary hosts.
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Port Checker — Complete Guide & Instructions
MakeCard Port Checker tests whether well-known service ports respond — but with a safety twist: you can only probe a whitelist of common ports on this server's own hostname, never arbitrary targets. Toggle the ports you want from the Web, Mail, Databases and System preset groups, hit scan, and see at a glance which are open and how fast each responded. It is a responsible way to verify a server's exposed services without enabling misuse.
How to Use Port Checker
- 1 Review the preset port groups — Web, Mail, Databases and System.
- 2 Click individual port numbers to toggle them, or click a group name to select all in that group.
- 3 Press “Scan selected ports”.
- 4 Each port shows OPEN (with response ms) or closed in the results grid.
- 5 Adjust the selection and re-scan to compare different services.
Key Features & Capabilities
- Preset groups for Web (80, 443, 8080, 8443), Mail (25, 110, 143, 465, 587, 993, 995), Databases (3306, 5432, 6379, 27017) and System (21, 22, 53).
- Toggle individual ports or select a whole group in one click.
- Server-side check restricted to this host's own hostname — no scanning of third parties.
- Response time shown for every open port.
- Up to 20 ports per scan.
- Clear OPEN / closed status cards for each port.
Supported Formats & Specifications
| Parameter | Specification |
|---|---|
| Scan Target | This server's hostname only — arbitrary hosts are not allowed |
| Port Presets | 18 common ports across Web, Mail, Database and System groups |
| Per-Scan Limit | 20 ports |
| Result | Open/closed status + response milliseconds per port |
| Method | Server-side socket probe on whitelisted ports |
Practical Everyday Use Cases
- Confirming a web server answers on 80/443 after a deployment.
- Checking that mail ports are reachable after changing a mail config.
- Verifying a database port is not unexpectedly exposed.
- Learning which common ports map to which services.
- A quick sanity check on a newly provisioned server.
Pro Tips for Best Results
- The scan deliberately only targets this server — it cannot check ports on other hosts; for that use a local tool like nmap on networks you own.
- An open database port (3306, 5432) on a public interface is a security red flag — investigate immediately.
- Response ms is a bonus signal: unusually slow opens can hint at an overloaded service.
- Scanning is restricted to well-known ports to keep the tool safe and legal for everyone.
Common Problems & Solutions
By design the tool only probes this site's hostname — use nmap or an OS-level check from a machine you control for your own servers.
The service may be down, firewalled, or bound to a different interface — check the service config and firewall rules.
Only 20 ports per scan are accepted — deselect some presets and run again.
Privacy & Security
100% Client-Side Execution
Probes run on MakeCard's server against its own hostname only — your port selections are not stored, and no third-party hosts can be targeted.
Frequently Asked Questions
Everything you need to know about using Port Checker
No — for safety the tool only checks a whitelist of common ports on this server's own hostname. Use a local scanner like nmap for hosts you own.
An open port has a service actively accepting connections on it — e.g. 443 for HTTPS. Closed or filtered ports refuse or drop the connection.
Web (80, 443, 8080, 8443), Mail (25, 110, 143, 465, 587, 993, 995), Databases (3306, 5432, 6379, 27017) and System (21, 22, 53).
An open port means something accepts connections — the web service could still be misconfigured or serving an error page. Check the app-level logs next.
Scanning ports you own or are authorized to test is fine — which is why this tool is limited to its own host. Unauthorized scanning of third parties can be illegal.
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