Some standard ports
  ftp-data 20 /tcp
  ftp      21 /tcp

  ssh      22 /tcp secure terminal

  telnet   23 /tcp terminal

  smtp     25 /tcp mail

  domain   53 /udp

  domain   53 /tcp

  bootps   67 /udp    # BOOTP/DHCP server

  bootpc   68 /udp    # BOOTP/DHCP client

  web service  80

  pop         110/tcp  for retrieving email, transfers.
  imap        143/tcp  for fetching email, leaves copy on server.

  secure web   443  # over ssl

  secure smtp  587  # also 465 
  imaps        993
  pop3s        995


  It is common for a service to have a different set of reserved ports for
  secure connections.

  
 IANA listing (text)
 IANA listing


ARP address resolution protocol IP->mac@ (link layer)
RARP reverse address resolution protocol IP->mac@ (link layer)
BootP bootstrap protocol  mac@->ip  (network layer, udp packet) port 67
DHCP dynamic host configuration protocol mac@<->ip (network layer)