Algumas das principais portas, protocolo e serviço correspondente.

Port/Protocol Description

20/tcp File Transfer Protocol FTP [Data Connection]
21/tcp File Transfer Protocol FTP [Control Connection]
22/tcp Secure Shell SSH remote Login Protocol (Only with security package)
23/tcp Telnet protocol
53/tcp Domain Name Server DNS
53/udp Domain Name Server DNS
67/udp Bootstrap Protocol or DHCP Server (only with dhcp package)
68/udp Bootstrap Protocol or DHCP Client (only with dhcp package)
80/tcp World Wide Web HTTP
123/udp Network Time Protocol NTP (Only with ntp package)
161/udp Simple Network Menagment Protocol SNMP (Only with snmp package)
443/tcp Secure Socket Layer SSL encrypted HTTP(Only with hotspot package)
500/udp Internet Key Exchange IKE protocol (Only with ipsec package)
514/udp Syslog server on MikroTik Dude Network Monitor Service (Only with MikroTik Dude package)
520/udp Routing Information Protocol RIP (Only with routing package)
521/udp Routing Information Protocol RIP (Only with routing package)
179/tcp Border Gateway Protocol BGP (Only with routing package)
1080/tcp SOCKS proxy protocol
1194/tcp Open Virtual Private Network OVPN (Only with ppp package)
1701/udp Layer 2 Tunnel Protocol L2TP (Only with ppp package)
1718/udp H.323 Gatekeeper Discovery (Only with telephony package)
1719/tcp H.323 Gatekeeper RAS (Only with telephony package)
1720/tcp H.323 Call Setup (Only with telephony package)
1723/tcp Point-to-Point Tuneling Protocol PPTP (Only with ppp package)
1731/tcp H.323 Audio Call Control (Only with telephony package)
1812/udp RADIUS Authentication Remote Access Dial in User service Authencitation
1813/udp RADIUS Accounting Remote Access Dial in User service Accounting
1900/udp Universal Plug and Play uPnP
1966/udp MME Mesh Made Easy Dynamic Mesh Protocol Origninator Messages (based on BATMAN)
1968/tcp MME Mesh Made Easy Dynamic Mesh Protocol Gateway Protocol(based on BATMAN)
2828/tcp Universal Plug and Play uPnP
2000/tcp Bandwidth-test server
2210/tcp MikroTik Dude Management Console Service (Only with MikroTik Dude)
2211/tcp Secure MikroTik Dude Management Console Service (Only with MikroTik Dude)
3986/tcp Proxy for winbox
3987/tcp SSL proxy for secure winbox (Only with security package)
5678/udp MikroTik Neighbor Discovery Protocol
8080/tcp HTTP Web proxy (Only with web-proxy package)
8291/tcp Winbox
20561/udp MAC winbox
5000+/udp H.323 RTP Audio Streem (Only with telephony package)
/1 ICMP - Internet Control Message Protocol
/4 IP - IP in IP (encapsulation)
/47 GRE - General Routing Encapsulation (Only for PPTP and EoIP)
/50 ESP - Encapsulating Security Payload for IPv4 (Only with security package)
/51 AH - Authentication Header for IPv4 (Only with security package)
/89 OSPFIGP - OSPF Interior Gateway Protocol
/112 VRRP - Virtual Router Redundancy Protocol

No site abaixo tem uma lista completa de todas as portas.
http://pt.wikipedia.org/wiki/Lista_de_portas_de_protocolos