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FTP (File Transfer Protocol)

TCP Port 20, 21

SSH (Secure Shell)

TCP Port 22


TCP Port 23

SMTP (Simple Mail Transfer Protocol)

TCP Port 25

DNS (Domain Name Service)

UDP/TCP Port 53

DHCP (Dynamic Host Configuration Protocol)

UDP Port 67, 68

TFTP (Trivial File Transfer Protocol)

UDP Port 69

HTTP (HyperText Transfer Protocol)

TCP Port 80

POP3 (Post Office Protocol)

TCP Port 110

NNTP (Network News Transfer Protocol)

TCP Port 119

NTP (Network Time Protocol)

UDP Port 123

IMAP4 (Internet Message Access Protocol)

TCP Port 143

SNMP (Simple Network Management Protocol)

UDP Port 161, 162, 10161, 10162

LDAP (Lightweight Directory Access Protocol)

TCP Port 389

HTTPS (HyperText Transfer Protocol Secure)

TCP Port 443

SMB (Server Message Block)

TCP Port 445

L2TP (Layer 2 Tunneling Protocol)

UDP Port 1701

PPTP (Point to Point Tunneling Protocol)

TCP Port 1723

RDP (Remote Desktop Protocol)

TCP Port 3389


UDP Port 33434-33534(Unix) or ICMP(Windows)


ICMP (no port)

Class A networks

1.x.x.x - 126.x.x.x

Class B networks

128.x.x.x - 191.x.x.x

Class C Networks

192.x.x.x - 223.x.x.x

Loopback address


APIPA Address range


Class A Private Networks

Class B Private Networks

Class C Private Networks


UDP ports 500 and 4500 and IP Protocol 50

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