Los puertos bien conocidos (well-known ports) son los del rango del 0 al 1023; en sistemas operativos derivados del Unix, abrir un puerto de este rango para recibir conexiones entrantes requiere privilegios administrativos.
Los puertos registrados están en el rango desde el 1024 al 49151. Los números de puerto del 49152 al 65535 son puertos dinámicos (privados), no usados por aplicaciones definidas.
Puertos Conocidos
| Puerto | Protocolo | Servicio | Observaciones |
| 1 | TCP | TCPMUX | TCP port service multiplexer |
| 7 | TCP - UDP | ECHO protocol | |
| 9 | TCP - UDP | DISCARD Protocol | |
| 13 | TCP - UDP | DAYTIME protocol | |
| 17 | TCP | QOTD protocol | Quote of the Day |
| 19 | TCP | CHARGEN protocol | Character Generator |
| 19 | UDP | CHARGEN protocol | |
| 20 | TCP | FTP - data port | File Transfer Protocol |
| 21 | TCP | FTP - control port | command |
| 22 | TCP | SSH - used for secure logins, file transfers and port forwarding | Secure Shell (scp, sftp) |
| 23 | TCP | Telnet protocol - unencrypted text communications | |
| 25 | TCP | SMTP - used for sending E-mails | Simple Mail Transfer Protocol |
| 37 | TCP - UDP | TIME protocol | |
| 53 | TCP | DNS | Domain Name Server |
| 53 | UDP | DNS | |
| 67 | UDP | BOOTP server; also used by DHCP | BootStrap Protocol - Dynamic Host Configuration Protocol |
| 68 | UDP | BOOTP client; also used by DHCP | |
| 69 | UDP | TFTP | Trivial File Transfer Protocol |
| 70 | TCP | Gopher protocol | |
| 79 | TCP | Finger protocol | |
| 80 | TCP | HTTP - used for transferring web pages | HyperText Transfer Protocol |
| 88 | TCP | Kerberos - authenticating agent | |
| 109 | TCP | POP2 | Post Office Protocol version 2 |
| 110 | TCP | POP3 | Post Office Protocol version 3 |
| 113 | TCP | ident | old server identification system, still used by IRC servers to identify its users |
| 119 | TCP | NNTP - used for retrieving newsgroups messages | Network News Transfer Protocol |
| 123 | UDP | NTP - used for time synchronization | Network Time Protocol |
| 139 | TCP | NetBIOS | |
| 143 | TCP | IMAP4 - used for retrieving E-mails | Internet Message Access Protocol 4 |
| 161 | UDP | SNMP | |
| 179 | TCP | BGP | Border Gateway Protocol |
| 389 | TCP | LDAP | Lightweight Directory Access Protocol |
| 443 | TCP | HTTPS - HTTP over SSL | encrypted transmission |
| 445 | TCP | Microsoft-DS | Active Directory, Windows shares, Sasser-worm, Agobot |
| 445 | UDP | Microsoft-DS SMB file sharing | |
| 465 | TCP | SMTP over SSL | |
| 514 | UDP | syslog protocol | used for system logging |
| 540 | TCP | UUCP | Unix-to-Unix Copy Protocol |
| 591 | TCP | FileMaker 6.0 Web Sharing | HTTP Alternate, see port 80 |
| 636 | TCP | LDAP over SSL | encrypted transmission |
| 666 | TCP | id Software's DOOM multiplayer game played over TCP | |
| 993 | TCP | IMAP4 over SSL | encrypted transmission |
| 995 | TCP | POP3 over SSL | encrypted transmission |
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