You can’t test a port with the standard ping command: it checks whether a host responds to ICMP, not whether a TCP or UDP service accepts traffic. To test a TCP port, use Test-NetConnection on Windows or nc on macOS and Linux. For example, try Test-NetConnection 192.0.2.10 -Port 443 or nc -vz -w 3 192.0.2.10 443.
What “ping an IP address and port” means
The phrase usually combines two separate checks:
- Host reachability: Does the target respond to an ICMP echo request?
- Port reachability: Can your computer reach a service listening on a particular TCP or UDP port?
For example, a test of 203.0.113.25 on port 22 should specify whether the service uses TCP or UDP. The number alone does not settle that: the same port number can be used with either transport. DNS, for instance, can use both UDP and TCP on port 53.
Ordinary ping sends ICMP echo requests, which have no TCP or UDP destination-port field. It can show that an ICMP exchange succeeded, but it cannot tell you whether a web server, SSH server, database, or other service is accepting connections. GNU Inetutils’ ping documentation describes this ICMP behavior.
Run the tests on Windows
Check ICMP reachability
ping 192.0.2.10To send four requests, use ping -n 4 192.0.2.10. To select an address family, use ping -4 192.0.2.10 or ping -6 2001:db8::10. Windows command-line options differ in places from Unix-like systems.
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Check a TCP port
Test-NetConnection -ComputerName 192.0.2.10 -Port 443Check the output for TcpTestSucceeded. A value of True means the TCP connection test succeeded; False means it did not. The detailed output can also show ComputerName, RemoteAddress, and RemotePort. For a Boolean-only result, run:
Test-NetConnection 192.0.2.10 -Port 443 -InformationLevel QuietThe shorter alias is tnc. PowerShell also supports the documented common TCP port names HTTP, RDP, SMB, and WINRM; for example, Test-NetConnection server.example.com -CommonTCPPort RDP. Use -Port for an arbitrary port. Microsoft documents Test-NetConnection syntax and its TCP port test.
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Run the tests on macOS or Linux
Check ICMP reachability
ping -c 4 192.0.2.10The -c 4 option sends four requests. Options vary between platforms; for example, Windows uses -n to set the request count.
Check a TCP port with netcat
nc -vz -w 3 192.0.2.10 443Here, -v requests verbose output, -z checks for a listening service without sending application data, and -w 3 sets a three-second timeout on implementations that support it. A success message may look like Connection to 192.0.2.10 443 port [tcp/https] succeeded!
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With nc, enter the address and port as separate arguments; 192.0.2.10:443 is not the syntax shown here. Netcat flags and output vary by implementation and OS release. Check the local help with nc -h or the manual with man nc. See the OpenBSD netcat manual for the documented behavior of its -z, -v, and -w options, and the macOS-related netcat manual for macOS syntax.
Use Nmap for multiple ports or additional detail
Nmap is useful when you need to check multiple ports or distinguish host discovery from port scanning. Use it only on systems you own or have explicit permission to test.
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- One TCP port:
nmap -p 443 192.0.2.10 - Several TCP ports:
nmap -p 22,80,443 192.0.2.10 - A TCP port range:
nmap -p 1-1024 192.0.2.10 - Optional service/version detection:
nmap -sV -p 443 192.0.2.10
If Nmap’s initial host-discovery step does not find the host, but you are authorized to check its port, skip that step with nmap -Pn -p 443 192.0.2.10. Nmap’s -Pn option treats targets as up for the scan rather than relying on host discovery first. See the Nmap host-discovery guide and the Nmap manual for discovery and scan options.
Test UDP with a protocol-aware check
A TCP connection test does not test UDP. UDP is connectionless, and a generic probe may receive no response even when a service is available. To scan a UDP port with Nmap, use nmap -sU -p 53 192.0.2.10. A result of open|filtered is inconclusive: Nmap did not receive enough information to distinguish an open port from filtering.
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Where possible, use the client for the service you are checking. For DNS, for example, query the server with dig @192.0.2.10 example.com. Do not treat a generic UDP timeout as proof that a port is closed. Nmap’s port-state documentation explains the possible UDP results and their limits.
Interpret ping and port-test results
These results are clues, not definitive diagnoses: firewalls and other network devices can block, reject, or alter traffic.
| ICMP ping | TCP port test | Likely interpretation |
|---|---|---|
| Succeeds | Succeeds | The host responds to ICMP and the TCP service is reachable from the test location. |
| Succeeds | Connection refused | The host is reachable, but no service accepted the connection, or a device actively rejected it. |
| Succeeds | Times out | The port or return traffic may be filtered, or the service may be unavailable. |
| Fails | Succeeds | ICMP may be blocked or deprioritized while the TCP service remains reachable. |
| Fails | Fails | The host or path may be unreachable, or both protocols may be filtered. |
| Fails | UDP result is ambiguous | Use a protocol-aware test or confirm the service from the server; UDP silence alone is not conclusive. |
Connection refused generally means a response indicated that the connection was not accepted or was actively rejected. Connection timed out means no usable response arrived before the timeout; it cannot distinguish on its own among a dead host, packet filtering, routing trouble, or an unavailable service.
Troubleshoot a failed port test
- Check the target and port. Confirm the IP address, port number, and whether the service uses TCP or UDP. If testing a hostname, check that it resolves to the address you intend.
- Check whether the service is listening. On the server, use a service-status tool or a local socket tool such as
ss,lsof, ornetstat. A running process may still be listening on the wrong port. - Check the bind address. A service bound only to
127.0.0.1accepts local connections but not connections through the server’s other interfaces. - Review filtering and forwarding. Check the server firewall, cloud security group or network ACL, router/NAT port-forwarding rule, VPN route, and any corporate outbound filtering. Rules may allow only specific source addresses.
- Test from the network where access matters. For an external-access problem, run the test from an external network. A test on the server or same LAN can behave differently because of local firewall rules, NAT loopback, VPN routing, or internal DNS.
- Separate IPv4 and IPv6. A hostname can resolve to both address families. On Unix-like systems, try
ping -4 example.comandping -6 example.com. To isolate a port test, use the literal IP address you want to check; PowerShell may choose an address based on system resolution and routing. - Continue with an application-level check. A successful TCP connection proves transport-level reachability, not that the application is healthy or configured correctly. For an appropriate service, test the protocol itself—for example,
curl -I https://192.0.2.10/for HTTPS orssh -v user@192.0.2.10for SSH. These are service-specific checks, not generic port tests.
Choose the right tool
| Question | First tool to try |
|---|---|
| Does the host respond to ICMP? | ping |
| Is one TCP port reachable on Windows? | Test-NetConnection |
| Is one TCP port reachable on macOS or Linux? | nc -vz |
| Do several ports need checking? | Nmap, with authorization |
| Is a UDP service responding? | The service’s client, or Nmap with protocol-aware interpretation |
| Is the issue with routing? | traceroute, tracert, or PowerShell route diagnostics |
The example addresses 192.0.2.10, 203.0.113.25, and 2001:db8::10 are documentation examples, not real service targets.
Test only systems you are allowed to check
A single connectivity test can be part of routine troubleshooting, but Nmap and netcat can also perform broader scans. Testing systems without authorization may violate organizational policy, a service’s terms, or applicable law. Get explicit permission before scanning systems you do not own or administer.
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