Powered by Nmap — the industry-standard network scanner. Discover open ports, running services, and their versions.
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A port scanner is a tool that checks which network ports on a server are open and what services are running behind them. Secably's port scanner is powered by Nmap, detects service names and versions, is free, and requires no signup.
Every server communicates through numbered ports — port 443 for HTTPS, 22 for SSH, 3306 for MySQL, and so on. A port scanner checks which of these ports are open and reachable, and identifies the service — often the exact version — listening on each one.
An open port is a door. Some are meant to be open, like your website on port 443. Others — a database on 3306, an admin panel, a forgotten dev service — should never face the public internet. A port scan tells you which doors are open before an attacker checks for you.
Every exposed service is a potential entry point. An outdated service on an open port, a database with no firewall, or remote access (RDP/SSH) reachable from anywhere is exactly what attackers scan the internet for.
The stakes are rising: exploited vulnerabilities are now the starting point for 20% of breaches, a 34% jump in a single year (Verizon DBIR, 2025) — and every one of those vulnerabilities is only reachable through an open port. Knowing exactly what you expose is the first line of defense.
Secably runs Nmap — the industry-standard network scanner — against your target, then reports each port's state and the service behind it.
Nmap attempts a connection to each port and records whether it is open, closed, or filtered by a firewall.
For each open port, Nmap fingerprints the service and its version — for example OpenSSH 8.9 or nginx 1.24 — so you know what's actually running.
The free scan covers the top 100 most-targeted ports. Pro scans all 65,535, so nothing hides on a high, unusual port number.
Port states, explained: open means a service is actively listening; closed means the port is reachable but nothing is listening; filtered means a firewall is dropping the probe, so the state can't be confirmed.
Type a hostname like example.com or an IP address. Secably resolves and scans it.
Scan the top 100 ports for a fast overview, ports 1–1000 for common services, or all 65,535 on Pro.
Every open port is listed with its service and version. Save or export the full report with a free account.