'FTP', 22 => 'SSH', 25 => 'SMTP', 53 => 'DNS', 80 => 'HTTP', 110 => 'POP3', 143 => 'IMAP', 443 => 'HTTPS', 465 => 'SMTPS', 587 => 'SMTP (TLS)', 993 => 'IMAPS', 995 => 'POP3S', 1433 => 'MSSQL', 3306 => 'MySQL', 3389 => 'RDP', 5432 => 'PostgreSQL', 6379 => 'Redis', 8080 => 'HTTP-Alt', 8443 => 'HTTPS-Alt', 27017 => 'MongoDB', ]; if ($query && $port) { if ($port < 1 || $port > 65535) { $error = 'Invalid port. Allowed range: 1–65535.'; } else { $host = preg_replace('/^https?:\/\//i', '', $query); $host = explode('/', $host)[0]; if (filter_var($host, FILTER_VALIDATE_IP)) { $ip = $host; } else { $ip = @gethostbyname($host); if ($ip === $host) { $error = 'Could not resolve host.'; $ip = ''; } } if ($ip && !$error) { set_time_limit(10); $start = microtime(true); $fp = @fsockopen($ip, $port, $errno, $errstr, 3); $ms = round((microtime(true) - $start) * 1000, 1); if ($fp) { fclose($fp); $results = ['status' => 'open', 'ms' => $ms]; } else { $results = ['status' => 'closed', 'ms' => $ms, 'error' => $errstr]; } } } } $dangerous_ports = [ 3306 => ['name' => 'MySQL', 'warn' => 'A publicly accessible MySQL database is a significant security risk. Attackers can perform brute-force attacks or exploit known vulnerabilities. MySQL should only be accessible internally or via SSH tunnel.'], 5432 => ['name' => 'PostgreSQL', 'warn' => 'PostgreSQL should never be directly accessible from the internet. Bind the service to 127.0.0.1 or use a firewall to block port 5432.'], 27017 => ['name' => 'MongoDB', 'warn' => 'A publicly accessible MongoDB is extremely dangerous – many instances without authentication have already been compromised. Secure immediately with firewall rules.'], 6379 => ['name' => 'Redis', 'warn' => 'Redis has no authentication by default. A public Redis port allows full data access and can be exploited for server takeover.'], 3389 => ['name' => 'RDP', 'warn' => 'An open RDP port is a common target for brute-force and ransomware attacks. Restrict access via firewall or use a VPN.'], 1433 => ['name' => 'MSSQL', 'warn' => 'Microsoft SQL Server should not be directly accessible from the internet. Use a firewall and restrict access to trusted IPs.'], ]; $info_ports = [ 80 => ['links' => [['url' => '/en/ssl-check.php?host='.urlencode($query), 'icon' => 'ti-lock', 'label' => 'SSL Check'], ['url' => '/en/headers.php?url='.urlencode($query), 'icon' => 'ti-eye', 'label' => 'HTTP Headers']], 'info' => 'HTTP is active. Port 80 is unencrypted – a redirect to HTTPS (port 443) should be configured.'], 443 => ['links' => [['url' => '/en/ssl-check.php?host='.urlencode($query), 'icon' => 'ti-lock', 'label' => 'SSL Check'], ['url' => '/en/headers.php?url='.urlencode('https://'.$query), 'icon' => 'ti-eye', 'label' => 'HTTP Headers']], 'info' => 'HTTPS is active. Check the SSL certificate for validity and security configuration.'], 22 => ['links' => [['url' => '/en/ip-lookup.php?ip='.urlencode($ip), 'icon' => 'ti-world-search', 'label' => 'IP Lookup']], 'info' => 'SSH is open. Make sure only key-based authentication is allowed and root login is disabled.'], 25 => ['links' => [['url' => '/en/blacklist.php?ip='.urlencode($ip), 'icon' => 'ti-shield-search', 'label' => 'Blacklist Check']], 'info' => 'SMTP is open. Check if the mail server is listed on spam blacklists.'], 587 => ['links' => [['url' => '/en/blacklist.php?ip='.urlencode($ip), 'icon' => 'ti-shield-search', 'label' => 'Blacklist Check']], 'info' => 'SMTP Submission (TLS) is open. This port is used for sending email from mail clients.'], 53 => ['links' => [['url' => '/en/dns-lookup.php?domain='.urlencode($query), 'icon' => 'ti-search', 'label' => 'DNS Lookup']], 'info' => 'DNS is open. Make sure the DNS server does not allow recursive queries from external IPs (open resolver).'], ]; require_once __DIR__ . '/header.php'; ?>
Tool
Port Check
Check if a port is open · Location: DE Düsseldorf, Germany
Status
Port
Service
ms
Response time
Port is
Host
IP Address
Port
Service
Response time ms
Status
What does this mean?
Security warning: publicly reachable!

Port () is reachable from our server in Düsseldorf. The service is running and accepting connections.

IP Lookup

Port is not reachable. Possible reasons: the service is not running, a firewall is blocking the port, or the port is intentionally closed.

Quick check common ports
Enter a domain or IP address and a port number to check. Tests are performed from Düsseldorf, Germany. Please only test servers you own or have explicit permission to test.
Common ports
'File transfer',22=>'Secure shell access',25=>'Send email',53=>'Domain resolution',80=>'Websites (unencrypted)',110=>'Retrieve email',143=>'Email (IMAP)',443=>'Websites (encrypted)',465=>'Email (SSL)',587=>'Email (TLS)',993=>'IMAP encrypted',995=>'POP3 encrypted',1433=>'Microsoft SQL Server',3306=>'MySQL database',3389=>'Windows Remote Desktop',5432=>'PostgreSQL database',6379=>'Redis cache',8080=>'Alternative web server',8443=>'Alternative HTTPS',27017=>'MongoDB database']; foreach ($known_ports as $p => $name): ?>
PortServiceDescription
Please only check servers and services that you own or have explicit permission to test. Unauthorized port scanning may be illegal.
My IP Port Check Ping Test SSL Check Blacklist

What is a Port Check?

A port check verifies whether a specific TCP port on a server is reachable from the outside. Ports are like doors to a server – each service listens on a specific port: web servers on port 80 (HTTP) and 443 (HTTPS), mail servers on port 25 (SMTP), SSH on port 22. If a port is closed, either the service is not running or a firewall is blocking access.