What is the maximum number of ports on a computer
The theoretical range of values for port numbers is from 0 to 65535, which is recognized as 0-1023, registered ports are 1024-49152, and there are also random dynamic ports that are 49152-65535, for a total of 65536 ports.
Common computer ports
HTTP:80: www service.
DHCP: The port number on the server side is 67
DHCP: The port number on the client side is 68
POP3: POP3 is just the receiving protocol, and the POP3 client uses SMTP to send mail to the server.The port number used for POP3 is 110.
SMTP: The port number is 25.SMTP SMTP is not really concerned with how mail is delivered, but only that it reaches its destination.SMTP has robust mail processing features that allow mail to be routed automatically based on certain criteria.SMTP has the ability to notify the user immediately when an email address does not exist and has the feature of returning undeliverable mail to the sender within a certain time frame.
The SMTP protocol is used by POP3 clients to send mail to the server.
Telnet: port 23. Telnet is one of the oldest Internet applications, originating from ARPNET, and its name is an acronym for “Telecommunication Network Protocol”.
FTP: FTP uses ports 20 and 21. port 20 is used for data transfer and port 21 is used for control signaling, which is unique to FTP in that control information and data can be transferred at the same time. ftp uses TCP connections.
TFTP: port 69, using a UDP connection.
DNS:53, Name Service
NetBIOS:137,138,139, of which 137 and 138 are UDP ports, which are used when transferring files through the Internet Neighborhood. And port 139: connections coming in through this port try to get NetBIOS/SMB services. This protocol is used for windows file and printer sharing and SAMBA. also WINSRegisrtation uses it.
NNTP Network News Transfer Protocol:119
SNMP (Simple Network Management Protocol):port 161
RPC (Remote Procedure Call) service:port 135
QQQ: uses ports 8000 (server) and 4000 (client)
Port 21: Port 21 is mainly used for FTP (FileTransferProtocol) service.
Port 23: Port 23 is mainly used for Telnet (remote login) service, which is a commonly used login and emulation program on the Internet.
Port 25: Port 25 is open for SMTP (SimpleMailTransferProtocol) servers, and is mainly used for sending mail, which is the protocol used by most mail servers today.
Port 53: Port 53 is open for DNS (DomainNameServer) servers, mainly used for domain name resolution, the most widely used DNS service in NT systems.
Ports 67 and 68: Ports 67 and 68 are open for BootstrapProtocolServer (Bootstrap Protocol Server) and BootstrapProtocolClient (Bootstrap Protocol Client) of the Bootp service, respectively.
Port 69: TFTP is a simple file transfer protocol developed by Cisco, similar to FTP.
Port 79: Port 79 is open for the Finger service, which is mainly used to query remote hosts for user details such as the online user, the type of operating system, and whether or not there is a buffer overflow.
Port 80: Port 80 is open for HTTP (HyperTextTransportProtocol), which is the most used protocol for surfing on the Internet, and is mainly used as a protocol for transmitting information on the WWW (WorldWideWeb) service.
Port 99: Port 99 is used for a service called MetagramRelay
This service is relatively rare and is generally not used.
Ports 109 and 110: Port 109 is open for the POP2 (PostOfficeProtocolVersion2) service, and port 110 is open for the POP3 (Post Office Protocol 3) service, both of which are primarily used for receiving mail.
Port 111: Port 111 is the port opened for SUN’s RPC (RemoteProcereCall, Remote Procedure Call) service, which is mainly used for internal process communication between different computers in a distributed system, and RPC is an important component in a variety of network services.
Port 113: Port 113 is mainly used for the Windows “AuthenticationService”.
Port 119: Port 119 is open for the NetworkNewsTransferProtocol (NNTP).
Port 135: Port 135 is mainly used to use the RPC (RemoteProcereCall) protocol and provide DCOM (Distributed Component Object Model) services.
Port 137: Port 137 is mainly used for the “NetBIOSNameService”.
Port 139: Port 139 is provided for the “NetBIOSSessionService”, which is mainly used to provide Windows file and printer sharing and Samba services in Unix.
Port 143: Port 143 is used for Internet Message Access Protocol v2 (IMAP).
Port 161: Port 161 is used for “SimpleNetworkManagementProtocol” (SNMP).
Port 443: Port 443, the web browsing port, is mainly used for HTTPS service, which is an alternative HTTP that provides encryption and transmission over a secure port.
Port 554: Port 554 is used by default for the RealTimeStreamingProtocol ” (Real Time Streaming Protocol, or RTSP for short).
Port 1024: Port 1024 is not normally assigned to a particular service, and is interpreted as “Reserved” in English.
Port 1080: Port 1080 is the port used by the Socks proxy service. The WWW service that you usually use on the Internet uses the HTTP proxy service.
Port 1755: port 1755 is used for “MicrosoftMediaServer” by default.
Port 3389: Remote Desktop
What is the remote port of a server and a brief description?
What is the connecting server port? Port generally refers to the port in the TCP/IP protocol, the port number ranges from 0 to 65535, generally connecting to the Linux cloud server to put through port 22, connecting to the Windows server needs to open port 3389.
3389 is the remote login port of the server, it is the default port for many servers to connect remotely, so many hackers are targeting this port for scanning, in order to ensure the security, you can modify the port for remote connection.
Port 22 is the ssh port, PcAnywhere establishes a connection between TCP and this port probably to look for ssh, tools used to connect to port 22 in linux are SSHSecureShell and others.
Users need to open the port in the security group before they can use the service corresponding to the port. After modifying the port of the service, you also need to be in the corresponding security group and open the corresponding port, or else it will result in the service not being able to be used. In addition, the more common server ports are: port 80, port 443, port 21 and so on.
Generally 80 as the access port of the web server, is the default port of the http protocol, in the input website in fact, the browser (non-IE) has helped you enter the protocol.
Port 21 is mainly used for FTP (FileTransferProtocol) service, FTP service is mainly for uploading and downloading files between two computers.
What is the Windows Remote Desktop port
1. The default Windows Remote Desktop port is 3389.
2. Users can modify the port of the Windows Remote Desktop service to any unoccupied TCP port by the following methods.
1, run regedit, open the registry editor.
2, open the registry entry [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TerminalServer\Wds\rdpwd\Tds\tcp], modify the value of PortNamber to the value you wish to PortNamber value to your desired port number, note that it is in decimal.
3. Open the registry entry [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TerminalServer\WinStations\RDP-Tcp], and modify the value of PortNamber to your desired PortNamber value to the port number you want.
4. Log off or reboot the host to make the service configuration information take effect.
What is the windows remote connection port
Windows remote desktop port, if it is its own system to provide remote desktop service port is 3389. if it is a shared remote link port, this has two kinds, one is based on the sMB protocol port 445 a netbios
over
tcp/ip
This is based on udp 137.138
and tcp 139
. ip
This is based on 137.138 for udp
and 139 for tcp