| HTTP | 80 | Hypertext Transfer Protocol used for web browsing |
| HTTPS | 443 | HTTP encrypted with SSL/TLS for secure web browsing |
| FTP | 20,21 | File Transfer Protocol used for transferring files |
| SSH | 22 | Secure Shell used for secure remote access and file transfer |
| Telnet | 23 | Telnet protocol used for remote access to command line |
| SMTP | 25 | Simple Mail Transfer Protocol used for email transmission |
| DNS | 53 | Domain Name System used for resolving domain names |
| DHCP | 67,68 | Dynamic Host Configuration Protocol used for IP address assignment |
| POP3 | 110 | Post Office Protocol used for retrieving emails |
| IMAP | 143 | Internet Message Access Protocol used for retrieving emails |
| SNMP | 161 | Simple Network Management Protocol used for network monitoring |
| RDP | 3389 | Remote Desktop Protocol used for remote access to desktop |
| SIP | 5060 | Session Initiation Protocol used for VoIP communication |
| RTP | 16384-32767 | Real-time Transport Protocol used for media streaming |
| SFTP | 22 | Secure File Transfer Protocol used for secure file transfer |
| SMTPS | 465 | SMTP encrypted with SSL/TLS for secure email transmission |
| IMAPS | 993 | IMAP encrypted with SSL/TLS for secure email retrieval |
| POP3S | 995 | POP3 encrypted with SSL/TLS for secure email retrieval |
| DNSSEC | 53 | DNS with added security features to prevent DNS attacks |
| NTP | 123 | Network Time Protocol used for time synchronization |
| SNMPv3 | 161 | SNMP version 3 with added security features for network monitoring |
| LDAP | 389 | Lightweight Directory Access Protocol used for directory services |
| LDAPS | 636 | LDAP encrypted with SSL/TLS for secure directory services |
| NNTP | 119 | Network News Transfer Protocol used for Usenet newsgroups |
| BGP | 179 | Border Gateway Protocol used for routing between networks |
| MQTT | 1883, 8883 | Message Queuing Telemetry Transport used for IoT communication |
| SMB | 445 | Server Message Block protocol used for file sharing |
| VNC | 5900 | Virtual Network Computing used for remote desktop access |
| DHCPv6 | 546, 547 | Dynamic Host Configuration Protocol for IPv6 address assignment |
| IPsec | 500, 4500 | Internet Protocol Security used for secure network communication |
| OpenVPN | 1194 | Open source VPN protocol used for secure remote access |
| HTTP/2 | 80, 443 | Updated version of HTTP with improved performance |
| QUIC | 80, 443 | Quick UDP Internet Connections protocol used for web browsing |
| XMPP | 5222, 5223 | Extensible Messaging and Presence Protocol used for instant messaging and presence information |
| RTPS | 7400 | Real-time Publish-Subscribe Protocol used in real-time systems |
| RTSP | 554 | Real-Time Streaming Protocol used for streaming media |
| SMB2 | 445 | Updated version of SMB protocol used for file sharing |
| Kerberos | 88 | Authentication protocol used for secure network communication |
| SMB3 | 445 | Updated version of SMB protocol used for file sharing |
| TFTP | 69 | Trivial File Transfer Protocol used for simple file transfer |
| NIS | 111 | Network Information Service used for user and group management |
| IRC | 6667 | Internet Relay Chat protocol used for real-time text messaging |
| Zeroconf | 5353 | Zero Configuration Networking protocol used for automatic network configuration |
| ICMP | N/A | Internet Control Message Protocol used for network error reporting |
| RADIUS | 1812 | Remote Authentication Dial-In User Service used for network authentication |
| SNMPv2c | 161 | SNMP version 2c used for network monitoring |
| Syslog | 514 | Protocol used for forwarding log messages across a network |
| Rsync | 873 | Remote Sync protocol used for efficient file synchronization |
| PPTP | 1723 | Point-to-Point Tunneling Protocol used for VPN connections |
| Bittorrent | 6881-6999 | Protocol used for peer-to-peer file sharing and downloading |
| DNS-over-TLS | 853 | DNS encrypted with TLS for secure domain name resolution |
| NFSv4 | 2049 | Network File System version 4 used for file sharing |
| DNS-over-HTTPS | 443 | DNS encrypted with HTTPS for secure domain name resolution |
| SSHFS | 22 | SSH File System used for remote file access |
| RTP/RTCP | N/A | Real-time Transport Protocol and Control Protocol used for streaming media |
| SSDP | 1900 | Simple Service Discovery Protocol used for network discovery |