Want to hack a network, you first learn to read the map — and in the world of hacking, that map is made of ports. Every open port tells an attacker what you're running, how old your system is, and how they might break in. This page turns that map around: search the 18 most-targeted ports, see what each one exposes, and learn what to do about it.
Key figure: Reported cybercrime losses in the United States reached $16.6 billion in 2024, up 33% from 2023 (FBI IC3, 2024 Internet Crime Report).
Trigger: James Code Lab reel, "18 Common Ports That Hackers Love (And Why)," October 18, 2026. Risk ratings reflect long-established, well-documented attack patterns — not novel claims.
A network port is a numbered doorway (0–65,535) that network services use to send and receive traffic. When a port is "open," a program is listening on it — which is useful for legitimate services but also gives attackers a place to knock. Closing ports you do not use shrinks what hackers can reach.
Search by number, name, or service — or filter by risk. Each entry: what the port does, what a hacker sees when it's open, and what you should do.
Some old protocols send everything in the open — including your username and password. Anyone watching the network path (public Wi-Fi, a compromised router, an ISP) can simply read them:
Rule of thumb: if a protocol was designed before encryption was standard, assume it leaks — and use its encrypted twin.
If you cannot name which ports are open on your home router right now, you are in the majority — and that is exactly what attackers count on. This 5-question check takes about a minute and tells you whether your open ports are an invitation to hackers or a non-issue.
No — a port is just a numbered door. The danger is what answers when someone knocks: an outdated service, a weak password, or a protocol that leaks credentials. A closed port tells an attacker nothing; an open one starts a conversation.
Start inside: your router's admin page lists port-forwarding rules and connected devices. From outside, free port-scan services (the "shields up" style) probe your public IP and report what answers. Never scan networks you don't own or lack written permission to test.
SMB is Windows file sharing — and it was the attack surface behind the WannaCry and NotPetya-era worms, which spread machine-to-machine through SMB flaws. It belongs on trusted internal networks only, never on the public internet.
If you don't use remote desktop, yes — close it. If you do, don't expose it bare: put it behind a VPN, enforce account lockout after failed logins, require strong credentials plus MFA, and restrict source IPs. Bare RDP is one of the most brute-forced services on the internet.
Routinely. Exposed database ports (3306 MySQL, 5432 PostgreSQL, 6379 Redis, 27017 MongoDB) are scanned constantly; open MongoDB instances were mass-ransomed in 2017, and Redis has shipped configurations without authentication. Bind databases to localhost or a private network and require authentication.
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