Cek apakah port tertentu pada IP atau domain terbuka atau tertutup dari luar jaringan Anda — berguna untuk server, game, remote desktop, dan troubleshooting firewall.
🔌 Port Checker
Host / IP Address
Nomor Port
Port Umum:
80 HTTP443 HTTPS22 SSH21 FTP3306 MySQL3389 RDP25565 Minecraft8080 Alt HTTP
Masukkan host dan port untuk mulai
Host
—
Port
—
Status
—
Layanan
—
Tes dilakukan dari server kami. Port yang tertutup bisa berarti firewall aktif, port belum dibuka, atau host tidak merespons.
Amankan Port Terbuka dengan NordVPN
Port terbuka bisa dieksploitasi oleh penyerang. NordVPN menyembunyikan IP asli dan menutup akses langsung ke port perangkat Anda dari internet.
Port adalah titik komunikasi virtual pada perangkat yang terhubung ke jaringan. Setiap layanan menggunakan nomor port tertentu — misalnya web server menggunakan port 80 dan 443, SSH menggunakan port 22. Port yang terbuka berarti perangkat menerima koneksi masuk pada port tersebut.
Port Umum dan Fungsinya
Port
Protokol
Fungsi
Risiko Jika Terbuka
21
FTP
Transfer file
Tinggi — data tidak terenkripsi
22
SSH
Remote terminal
Sedang — aman jika pakai key auth
80
HTTP
Web server
Rendah — standar web
443
HTTPS
Web server terenkripsi
Rendah — standar web aman
3306
MySQL
Database
Sangat Tinggi — jangan expose ke internet
3389
RDP
Remote Desktop Windows
Tinggi — target brute force
25565
Minecraft
Game server
Rendah — perlu untuk hosting
Pertanyaan Umum
Mengapa port saya tertutup padahal sudah dibuka di server? +
Kemungkinan ada firewall di depan server (dari ISP, router, atau cloud provider) yang memblokir port tersebut. Cek security group jika menggunakan VPS cloud seperti AWS atau DigitalOcean, atau cek pengaturan firewall router Anda.
Apa perbedaan port terbuka dan port tertutup? +
Port terbuka berarti ada layanan yang mendengarkan dan menerima koneksi. Port tertutup berarti tidak ada layanan aktif atau firewall memblokir koneksi masuk. Port filtered berarti firewall membuang paket tanpa memberi respons.
Apakah aman membiarkan semua port terbuka? +
Tidak. Hanya buka port yang benar-benar diperlukan. Port database seperti 3306 dan 5432 tidak boleh terbuka ke internet. Port SSH sebaiknya diganti dari 22 ke port non-standar untuk mengurangi serangan otomatis.
Apakah alat ini bisa mengecek port saya sendiri? +
Ya. Klik tombol "Gunakan IP Saya" untuk mengisi IP publik Anda secara otomatis, lalu masukkan nomor port yang ingin dicek. Tes dilakukan dari server kami sehingga hasilnya mencerminkan akses dari luar jaringan Anda.
Check whether a specific port on an IP or domain is open or closed from outside your network — useful for servers, gaming, remote desktop, and firewall troubleshooting.
🔌 Port Checker
Host / IP Address
Port Number
Common Ports:
80 HTTP443 HTTPS22 SSH21 FTP3306 MySQL3389 RDP25565 Minecraft8080 Alt HTTP
Enter a host and port to begin
Host
—
Port
—
Status
—
Service
—
Test is performed from our server. A closed port may mean an active firewall, port not forwarded, or host not responding.
Secure Open Ports with NordVPN
Open ports can be exploited by attackers. NordVPN hides your real IP and prevents direct access to your device's ports from the internet.
A port is a virtual communication endpoint on a networked device. Each service uses a specific port number — for example, web servers use ports 80 and 443, SSH uses port 22. An open port means the device is accepting incoming connections on that port.
Common Ports and Their Uses
Port
Protocol
Use
Risk If Open
21
FTP
File transfer
High — unencrypted data
22
SSH
Remote terminal
Medium — safe with key auth
80
HTTP
Web server
Low — standard web
443
HTTPS
Encrypted web server
Low — standard secure web
3306
MySQL
Database
Very High — never expose to internet
3389
RDP
Windows Remote Desktop
High — brute force target
25565
Minecraft
Game server
Low — needed for hosting
Frequently Asked Questions
Why is my port closed even though I opened it on the server? +
There may be a firewall in front of your server (from your ISP, router, or cloud provider) blocking that port. Check security groups if using cloud VPS like AWS or DigitalOcean, or check your router firewall settings.
What is the difference between an open and closed port? +
An open port means a service is listening and accepting connections. A closed port means no active service or a firewall is blocking incoming connections. A filtered port means a firewall is dropping packets without responding.
Is it safe to leave all ports open? +
No. Only open ports that are strictly necessary. Database ports like 3306 and 5432 should never be exposed to the internet. SSH is best moved from port 22 to a non-standard port to reduce automated attacks.
Can this tool check my own ports? +
Yes. Click "Use My IP" to automatically fill in your public IP address, then enter the port number you want to check. The test is performed from our server so the result reflects access from outside your network.
