Port Checker
Look up TCP and UDP port numbers, identify common services, and understand where a port falls within the standard port ranges.
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Known portPort Range Overview
Common Ports Reference
| Port | Protocol | Service | Description |
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Free TCP and UDP Port Lookup
The Utiliverse Port Checker helps identify what a network port is commonly used for. Enter a port number such as 443 or a service name such as HTTPS, choose TCP, UDP, or Any, and the tool searches its built-in reference list. It also shows whether the port belongs to the well-known, registered, or dynamic/private range.
Network ports range from 0 through 65535. The reference tool divides them into well-known ports from 0–1023, registered ports from 1024–49151, and dynamic/private ports from 49152–65535. citeturn637045view0
How to Use the Port Checker
Look up a port number
Type a number from 0 through 65535 and select the protocol. If the port is in the built-in common-services table, the page displays the service name and description. If no common service is listed, the tool still shows the correct numerical range for the port.
Search by service name
You can also enter a service such as HTTPS, SSH, DNS, MySQL, PostgreSQL, Redis, RDP, or WireGuard. When a service uses more than one protocol or port, the selected protocol helps narrow the result.
Understand TCP and UDP
TCP is connection-oriented and provides reliable, ordered delivery, while UDP is connectionless and emphasizes low overhead and speed. HTTP, HTTPS, SSH, and many database services commonly use TCP. DNS, DHCP, NTP, VoIP, and many real-time applications commonly use UDP, though some services support both. citeturn637045view0
Understand well-known ports
Ports 0 through 1023 are commonly called well-known or system ports. Familiar examples include SSH on 22, DNS on 53, HTTP on 80, and HTTPS on 443. These low-numbered ports are associated with standardized core services.
Understand registered ports
Ports 1024 through 49151 are the registered or user range. Many applications and databases operate here, including MySQL on 3306, PostgreSQL on 5432, Redis on 6379, and numerous vendor-specific services.
Understand dynamic and private ports
Ports 49152 through 65535 are commonly used as dynamic or ephemeral ports. Client systems frequently choose temporary source ports from this high range when opening outbound connections.
Practical Uses
Firewall configuration
Before allowing or blocking a port, look up its common service to verify what type of application may be affected. A port number alone does not prove which program is actually listening, but the reference can help identify the conventional use.
Server troubleshooting
If a web server, database, VPN, mail service, or remote-management tool is not reachable, confirming the expected service port is a useful first step before checking firewall rules, NAT, routing, or the actual listening process.
Learning common networking ports
The filterable reference table is useful for students, IT staff, developers, and administrators learning commonly encountered TCP and UDP services.
Security reviews
Open ports represent network entry points, so unnecessary services should generally be disabled or restricted. The reference site recommends closing ports that are not needed, using firewalls, auditing open ports, and keeping exposed services patched. citeturn637045view0
Why this browser tool does not scan hosts
A normal web page cannot create arbitrary raw TCP or UDP socket connections to any host and port. Browsers intentionally restrict that capability. A true reachability scan requires a server-side probe, command-line tool, native application, browser extension with special permissions, or another network-capable service. This Utiliverse page therefore performs a reliable local port/service lookup rather than displaying invented open/closed results.
Port Checker FAQ
What port does HTTPS use?
HTTPS commonly uses TCP port 443.
What port does SSH use?
SSH commonly uses TCP port 22.
What port does DNS use?
DNS commonly uses port 53. UDP is common for standard queries, while TCP is also used for cases such as zone transfers and larger responses.
What is the highest valid port number?
Port numbers range from 0 through 65535.
What are ephemeral ports?
They are temporary ports commonly selected by client systems for outbound connections, typically from the dynamic/private range of 49152–65535.
Can this tool tell whether a remote port is open?
No. This standalone browser tool performs port and service lookup. A real remote port test requires a network-capable backend or native socket access.
Does a known port guarantee that service is running?
No. Port assignments describe conventional usage. An administrator can configure software on a nonstandard port, and any service may be absent even when a port number is commonly associated with it.