Network Connectivity Test Online - HTTP Latency / TCP Port / Packet Loss
HTTP latency / TCP port probe / Packet loss stats
About Network Connectivity Testing
The HTTP latency mode measures response time by sending requests from the browser, reflecting server responsiveness. The TCP port mode probes the target port for connectivity with more precise results. To further check domain resolution, use DNS Lookup; for service ports, pair it with Port Check.
Use Cases for Connectivity Testing
Server monitoring: periodically test response latency to spot performance issues early. Network troubleshooting: judge network quality from packet loss and latency variance. CDN evaluation: compare latency across nodes to verify CDN acceleration. Port reachability: confirm whether a firewall allows a specific port.
FAQ
What is the difference between an HTTP latency test and ICMP ping?
ICMP ping sends echo packets at the OS level, which browsers cannot do directly. This tool’s HTTP latency mode measures server response time by sending requests, closer to real web-browsing experience. The TCP port probe checks port connectivity and connection latency.
How accurate is the TCP port probe?
The TCP port probe connects directly to the target port to test connectivity, accurately determining whether the port is open and how long the connection takes. It also works for non-HTTP ports such as databases or SSH, giving it broader applicability.
What causes a high packet loss rate?
Possible causes: network congestion causing routers to drop packets, a firewall blocking connections, an overloaded target server that cannot respond, or a faulty network line. Minor loss (<5%) usually does not affect normal use; for a high loss rate, switch networks or contact your ISP.
Why is cross-border latency higher?
Physical distance causes signal propagation delay (about 3-5 ms per 1000 km); combined with international egress bandwidth bottlenecks and more transit routing nodes, cross-border latency is usually higher. Choose a nearby node or use an acceleration service to reduce it.