Application protocols. well-known ports

Name TCP or UDP Port Use
HTTP tcp 80 web
HTTPS tcp 443 secure SSL/TSL web
FTP tcp 21 (control) 20 (data) file transfer
TFTP udp 69 no password, no dir
Telnet tcp 23 remote login
SSH tcp 22 secure remote login. Also SFTP, SCP
SMTP tcp 25 sending email. 587: over TLS
POP3 tcp 110 retrieving email. 995: over TLS
IMAP4 tcp 143 retrieving email at server. 993: TLS
DNS udp 53 name resolution
DNS tcp 53 zone transfer
DHCP udp 67 server
DHCP udp 68 client
SNMP udp 161, 162 trap network management
Syslog udp 514 message logging. To the SIEM
NTP udp 123 time server
MS SMB tcp 445 file sharing. CIFS
MS NetBIOS tcp? 137,138,139 name service (broadcast vs WINS server)
SSDP udp 1900 UPnP discovery
RDP 3389 MS remote desktop
PPTP tcp 1723 VPN
LDAP tcp 389 directory services. LDAPS 636
RIP udp 520 interior routing
BGP tcp 179 exterior routing
RTP udp 5004 VoIP, video
SIP tcp 5060, 5061 VoIP signalling
H.323 both? 1720 call signalling

IANA: ports 1-49001 "assigned"

C:\Windows\System32\drivers\etc\services
/etc/services
https://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers

Simple TCP services
Echo tcp 7
Discard tcp 9 sink
Daytime tcp 13
QOTD tcp 17 quote of the day
CHARGEN tcp 19 source

Turn on Windows "simple TCP/IP services"
  Start | Windows System | Control Panel | Programs and Features | ...
        | Turn Windows features on or off | Simple TCPIP services (i.e. echo, daytime etc.)
Then in Services (e.g. Task Manager|Services|Open Services), 
  Start the "Simple TCP/IP Services" service.