Ports Flashcards
TCP Port 22
SSH – Secure Shell, used for secure logins, file transfers, and port forwarding.
TCP Port 23
Telnet – Used for remote command-line access (insecure).
TCP Port 25
SMTP – Simple Mail Transfer Protocol, used for sending emails.
TCP Port 53
DNS – Domain Name System, used for resolving domain names to IP addresses.
TCP Port 80
HTTP – Used for unencrypted web traffic.
TCP Port 110
POP3 – Post Office Protocol, used for retrieving emails.
TCP Port 111
RPC – Remote Procedure Call, used for executing commands on remote systems.
TCP Port 135
RPC – Microsoft RPC services for Windows DCOM communication.
TCP Port 139
NetBIOS – Used for Windows file and printer sharing.
TCP Port 143
IMAP – Internet Message Access Protocol, used for retrieving emails.
TCP Port 443
HTTPS – Secure HTTP for encrypted web traffic.
TCP Port 445
SMB – Server Message Block, used for file sharing on Windows networks.
TCP Port 993
IMAPS – Secure version of IMAP for encrypted email retrieval.
TCP Port 995
POP3S – Secure version of POP3 for encrypted email retrieval.
TCP Port 1723
PPTP – Point-to-Point Tunneling Protocol for VPNs.
TCP Port 3306
MySQL – Used for MySQL database connections.
TCP Port 3389
RDP – Remote Desktop Protocol for remote access to Windows systems.
TCP Port 5900
VNC – Virtual Network Computing, used for remote desktop access.
TCP Port 8080
HTTP Proxy – Common alternative HTTP port, often used for proxies or web servers.
UDP Port 53
DNS – Domain Name System, used for resolving domain names to IP addresses.
UDP Port 67
DHCP – Dynamic Host Configuration Protocol (server to client).
UDP Port 68
DHCP – Dynamic Host Configuration Protocol (client to server).
UDP Port 69
TFTP – Trivial File Transfer Protocol, used for simple file transfers.
UDP Port 123
NTP – Network Time Protocol, used for clock synchronization.
UDP Port 135
RPC – Microsoft RPC services for Windows DCOM communication.
UDP Port 137
NetBIOS – Name service for resolving NetBIOS names to IP addresses.
UDP Port 138
NetBIOS – Datagram service for network communication.
UDP Port 139
NetBIOS – Session service for network file and printer sharing.
UDP Port 161
SNMP – Simple Network Management Protocol, used for network management.
UDP Port 162
SNMP Trap – Used for sending SNMP trap notifications.
UDP Port 445
SMB – Server Message Block, used for file sharing on Windows networks.
UDP Port 500
IKE – Internet Key Exchange for VPNs.
UDP Port 514
Syslog – Used for forwarding log messages.
UDP Port 520
RIP – Routing Information Protocol, used for routing updates.
UDP Port 631
IPP – Internet Printing Protocol, used for network printing.
UDP Port 1434
Microsoft SQL Server – Used for SQL Server browser service.
UDP Port 1900
UPnP – Universal Plug and Play, used for device discovery.
UDP Port 4500
IKE NAT-T – Internet Key Exchange for VPN NAT traversal.
TCP Port 21
FTP – File Transfer Protocol, used for transferring files between a client and a server (control connection).
What are registered ports?
Ports ranging from 1024 to 49151 and assigned by IANA for specific services or applications. They are commonly used by software vendors for proprietary applications.
What are known ports?
Known ports, also called well-known ports, range from 0 to 1023 and are reserved by IANA for core network services and protocols, such as HTTP (80), FTP (21), and SSH (22).
