Classes
Common Port Numbers
100
This class begins with the octet 128 through 191.
What is Class B?
100
This port is uses the protocol HTTP.
What is port 80?
200
This class begins with the octet 1 through 127.
What is Class A?
200
This port is uses the protocol DNS.
What is port 53?
300
The private IP address range for this class is 172.16.0.0 through 172.31.255.255.
What is Class B?
300
These three protocols use ports 110, 143, and 25 and are used for outgoing and incoming emails.
What is POP3, IMAP4, and SMTP?
400
This class begins with the octet 192 through 223.
What is Class C?
400
This port is uses the protocol HTTPS.
What is port 443?
500
The private IP address range for this class begins with 192.168.0.0 and has 65,536 hosts.
What is Class C?
500
This protocol uses ports 67 and 68.
What is DHCP?
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