If this tool helped you, you can buy us a coffee ☕
Look up service names and descriptions for TCP/UDP port numbers. Covers IANA standard ports for network management, development, and security.
No data available for this tool
Random User Agent Generator
Generate random browser User-Agent strings for developers, QA testers, and web scrapers to simulate various devices and platforms.
Download Link Converter
Convert HTTP/HTTPS file URLs into dedicated download links for Thunder, FlashGet, and QQ Xuanfeng to use with various download clients.
IPv4 / IPv6 Address Converter
A two-way IPv4 and IPv6 address converter for network configuration, debugging, and format validation.
When you encounter an unknown port or need to confirm the standard service of a specific port, you often need to quickly look up its official definition. This tool is an online lookup utility based on the IANA (Internet Assigned Numbers Authority) standard port database. It returns the corresponding network service name, protocol, and standard functional description based on the port number you enter. It primarily processes port numbers, which are integers between 0 and 65535 used to identify different network application processes on a host.
Q: What is port 80 used for?
Port 80 is the standard port for HTTP (Hypertext Transfer Protocol) services, used to provide web browsing services.
Q: Why does the "Port/Protocol" column in the results sometimes show only a number, and sometimes show "number/tcp"? What does this mean?
This indicates the protocol binding status of the port when registered with IANA. Showing only a number (e.g., "443") usually means the port number is associated with both TCP and UDP protocols, or is universally applicable by default. Showing "number/tcp" (e.g., "22/tcp") means the service is explicitly registered in the standard to use only the TCP protocol. Our tool accurately reflects these differences in registration information.
This tool is a static reference library for port information, not a real-time port scanner. It cannot detect the actual open status of ports on your or a remote host. Port usage may vary due to private protocols or specific application configurations; the definitions provided here are the most common or official ones. When performing network configuration or security audits, please be sure to verify against your actual environment.
For network administrators and developers, understanding port classifications helps troubleshoot issues efficiently. Well-known ports (0-1023) typically require system privileges to bind, such as SSH (22/tcp) and HTTPS (443/tcp). Registered ports (1024-49151) are used for user-level processes, such as MySQL (3306/tcp) and Redis (6379/tcp). Dynamic/private ports (49152-65535) are usually used for temporary connections. A typical query example is entering "53/udp", which will return the service name "domain" and the description "DNS (Domain Name System)", clarifying that DNS queries typically use the UDP protocol on port 53.
