网络中的IP地址和端口号有什么区别？

Question

网络中的IP地址和端口号有什么区别？

Answer 1

IP address is address of the system in the Network.

Port is address of the service within the System.

So IP address + Port defines address of the particular service on the particular system.

Answer 2

IP 地址用于标识网络中的一个主机或一组主机，而端口号用于标识在主机中运行的特定服务

Answer 3

Think about how many application layer protocols exist ( HTTP , FTP , DNS , SSH , etc). Now think about how many task / process / programs exist within your device trying to communicate over the internet. Would it be possible just one address, the IP address, to be able to handle all these different assignments and types of protocols alone? The answer is no.

The IP address is a numerical label assigned to each device connected to a computer network that uses the Internet Protocol for communication. The port number is used so the data is directed to the correct location within this device .

The IP and the port number form the structure IP:port number, 192.168.1.1:8080 for example, and the port number can hold 65536 numbers, with the following division:

• 0 to 1023 - Well known port numbers. Only special companies like Apple QuickTime, MSN, SQL Services, Gopher Services and other prominent services have these port numbers.

• 1024 to 49151 - Registered ports; meaning they can be registered to specific protocols by software corporations.

• 49152 to 65536 - Dynamic or private ports; meaning that they can be used by just about anybody.

Answer 4

Port number is used to identify an application/services which you want to talk to on your system. Some predefined ports like 80 = HTTP server, 23 = Telnet.

You identify a host uniquely (globally) by its IP address. So if I ever wanted to access your laptop via telnet then I'd use the IP address given to you by your ISP and the port 23

Answer 5

A MAC address is a layer-2 address. It is used by some layer-2 protocols, eg ethernet and Wi-Fi. There are 48-bit and 64-bit MAC addresses. Some layer-2 protocols use different addressing.

An IP address is the address of the layer-3 IP protocol. Different layer-3 protocols use different addressing, eg IPv4, IPX, and IPv6 each have different addressing.

A port number is a layer-4 address used by some layer-4 protocols, eg TCP and UDP. Some layer-4 protocols use different addressing, or none at all.

TCP example: RFC 793, TRANSMISSION CONTROL PROTOCOL

Multiplexing:

To allow for many processes within a single Host to use TCP communication facilities simultaneously, the TCP provides a set of addresses or ports within each host . Concatenated with the network and host addresses from the internet communication layer, this forms a socket. A pair of sockets uniquely identifies each connection. That is, a socket may be simultaneously used in multiple connections.

You may want to learn more about the network layers.

Answer 6

Simply:

• A socket is like a telephone (ie end to end device for communication)
• IP is like your telephone number (ie address of your socket)
• Port is like the person you want to talk to (ie the service you want to order from that address)

In networking, generally a socket is (IP+Port)

Answer 7

IP address: Ip address is a address of your system, it assign when your system connects to internet.There are two types of ip address available here among first one is dynamic which invokes at your system in online. Second one is static, which assign when your system get in offline.

port address Port address is an Id of server such as your using apache server that get port number default 8080 is id of apache server,If you can change server port number.

Answer 8

IP address is your system domain name or socket address of specific system like 192.168.0.1

but the port number is the number of specific location or folder where to you want to write your file or any file transfer like: 3308

Answer 9

The IP address of your computer (host) is the mix of the network ID of the ISP/any other provider (uniquely provided by the ICANN group) and the host name (provided by the Network administrator). The Network ID is unique for all the network and among two networks, we can have same host names but on the same network, the host names can not be the same. So, this is how the host can be identified on the network and data can be transferred. But on the same host multiple applications will be running and once the data reach to the host, we need an identifier to recognize which application data is this TCP Segment/UDP datagram.

The Port number is 16 bits (possibly 65K application can run) and assigned by the Network operating system when the application process creates the sockets. On the Server side, the port numbers are well defined numbers (HTTP- Port #80, SMTP- Port#25). The port number is transport layer addressing (L4) and goes in the header of TCP/UDP.