Open port checker
Common ports and what they do
| Port | Protocol | Service | What it does | Used by |
|---|---|---|---|---|
| 20–21 | TCP | FTP | File transfer (21 control, 20 data). Unencrypted. Keep closed to the internet | FileZilla, vsftpd, IIS FTP |
| 22 | TCP | SSH / SFTP | Secure remote login and file transfer. | OpenSSH, PuTTY, WinSCP |
| 23 | TCP | Telnet | Old remote login without encryption. Keep closed to the internet | Old routers, IoT devices |
| 25 | TCP | SMTP | Email delivery between mail servers. | Postfix, Exim, Microsoft Exchange |
| 53 | TCP/UDP | DNS | Turns domain names into IP addresses. | BIND, Unbound, home routers, 1.1.1.1 |
| 67–68 | UDP | DHCP | Hands out IP addresses on a local network. | Home routers, Windows Server |
| 69 | UDP | TFTP | Simple file transfer for network booting and firmware. Keep closed to the internet | PXE boot, network switches |
| 80 | TCP | HTTP | Unencrypted websites. | Nginx, Apache, IIS |
| 110 | TCP | POP3 | Downloading email from a mail server. | Outlook, Thunderbird |
| 123 | UDP | NTP | Keeps device clocks in sync. | Windows Time, chrony, ntpd |
| 135 | TCP | MS RPC | Windows remote procedure calls. Keep closed to the internet | Windows |
| 137–139 | TCP/UDP | NetBIOS | Older Windows file and printer sharing. Keep closed to the internet | Windows, Samba |
| 143 | TCP | IMAP | Reading email that stays on the server. | Outlook, Thunderbird, Apple Mail |
| 161–162 | UDP | SNMP | Monitoring and managing network devices. Keep closed to the internet | Routers, printers, Zabbix, PRTG |
| 389 | TCP/UDP | LDAP | Directory of users and computers. Keep closed to the internet | Active Directory, OpenLDAP |
| 443 | TCP/UDP | HTTPS | Encrypted websites; UDP 443 carries HTTP/3 (QUIC). | Every browser and web server |
| 445 | TCP | SMB | Windows file sharing. Keep closed to the internet | Windows, Samba, NAS devices |
| 465 | TCP | SMTPS | Sending email over an encrypted connection. | Outlook, Thunderbird, Gmail |
| 500 / 4500 | UDP | IPsec (IKE) | Setting up IPsec VPN tunnels. | Windows VPN, iPhone VPN, firewalls |
| 514 | UDP | Syslog | Sending log messages to a log server. Keep closed to the internet | Routers, Linux servers, Graylog |
| 554 | TCP/UDP | RTSP | Live video streams, mostly from IP cameras. Keep closed to the internet | IP cameras, VLC |
| 587 | TCP | SMTP / Submission | Email apps sending mail to their server. | Outlook, Thunderbird, phones |
| 631 | TCP | IPP | Network printing. Keep closed to the internet | CUPS, network printers |
| 636 | TCP | LDAPS | LDAP over an encrypted connection. Keep closed to the internet | Active Directory |
| 853 | TCP | DNS over TLS | Encrypted DNS lookups. | Android Private DNS, 1.1.1.1 |
| 993 | TCP | IMAPS | IMAP over an encrypted connection. | Outlook, Thunderbird, phones |
| 995 | TCP | POP3S | POP3 over an encrypted connection. | Outlook, Thunderbird |
| 1194 | UDP | OpenVPN | OpenVPN tunnels (default port). | OpenVPN, many VPN apps |
| 1433 | TCP | Microsoft SQL Server | Microsoft database server. Keep closed to the internet | SQL Server |
| 1521 | TCP | Oracle Database | Oracle database listener. Keep closed to the internet | Oracle Database |
| 1723 | TCP | PPTP | Old VPN protocol, no longer considered secure. Keep closed to the internet | Old routers, legacy VPNs |
| 1883 / 8883 | TCP | MQTT | Messages between IoT devices (8883 is encrypted). Keep closed to the internet | Mosquitto, Home Assistant |
| 1900 | UDP | SSDP / UPnP | Devices finding each other on a home network. Keep closed to the internet | Smart TVs, routers, media servers |
| 2049 | TCP/UDP | NFS | Network file sharing on Linux and Unix. Keep closed to the internet | Linux servers, NAS devices |
| 3074 | TCP/UDP | Xbox Live | Online gaming on Xbox. | Xbox consoles |
| 3306 | TCP | MySQL / MariaDB | Database server. Keep closed to the internet | MySQL, MariaDB, phpMyAdmin |
| 3389 | TCP/UDP | RDP | Windows Remote Desktop. Keep closed to the internet | Windows Remote Desktop |
| 3478–3480 | TCP/UDP | STUN / TURN, PlayStation Network | Video calls and online play getting through home routers. | WebRTC apps, PlayStation |
| 5060 / 5061 | TCP/UDP | SIP | Internet phone calls (5061 is encrypted). Keep closed to the internet | VoIP phones, Asterisk |
| 5222 | TCP | XMPP | Chat messaging. | Jabber/XMPP clients, ejabberd |
| 5353 | UDP | mDNS | Finding devices by name on a local network. | Apple Bonjour, AirPlay, Chromecast |
| 5432 | TCP | PostgreSQL | Database server. Keep closed to the internet | PostgreSQL |
| 5900 | TCP | VNC | Remote control of a computer's screen. Keep closed to the internet | RealVNC, TightVNC, macOS Screen Sharing |
| 6379 | TCP | Redis | In-memory database and cache. Keep closed to the internet | Redis |
| 6881–6889 | TCP/UDP | BitTorrent | Peer-to-peer file sharing (traditional range). | qBittorrent, Transmission |
| 8080 | TCP | HTTP-alt | Web servers, proxies and admin panels. Keep closed to the internet | Tomcat, Jenkins, router panels |
| 8443 | TCP | HTTPS-alt | Encrypted admin panels and web apps. Keep closed to the internet | Router panels, Plesk, UniFi |
| 9100 | TCP | JetDirect / RAW | Sending print jobs straight to a printer. Keep closed to the internet | HP JetDirect and most network printers |
| 19132 | UDP | Minecraft Bedrock | Minecraft Bedrock Edition servers. | Minecraft (Bedrock) |
| 25565 | TCP | Minecraft Java | Minecraft Java Edition servers. | Minecraft (Java) |
| 27015 | TCP/UDP | Steam / Source | Game servers for Source-engine games. | Counter-Strike, Team Fortress 2, Garry's Mod |
| 27017 | TCP | MongoDB | Database server. Keep closed to the internet | MongoDB |
| 51820 | UDP | WireGuard | WireGuard VPN tunnels (default port). | WireGuard and WireGuard-based VPN apps |
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