01
Port Checker
Check if a TCP or UDP port is reachable from the public internet before you invite players or users.
Open or blocked
Game servers, web apps, SSH, panels
Free tools
Diagnose your server before guessing.
Check ports, detect CGNAT, and measure latency from one lightweight tool hub. No signup required.
01
Reachability
02
NAT status
03
Latency
If a server is unreachable, start with the port check. If forwarding looks correct but still fails, test for CGNAT. If users can connect but complain about lag, measure route quality.
02
CGNAT Detector
Find out if your ISP is using Carrier-Grade NAT, the common reason port forwarding does not work.
Public IP status
Home hosts, self-hosters, game servers
03
Latency Tester
Measure response time, jitter, and packet loss to understand if lag is network, route, or server related.
Ping and jitter
Minecraft, FiveM, Rust, remote servers
What to check first
Port forwarding not working? Use Port Checker to confirm if traffic is actually reaching your server.
Router looks right but nothing connects? CGNAT Detector helps confirm whether your ISP is sharing your public address.
Players can connect but lag spikes? Latency Tester gives you ping, jitter, and packet loss signals before you change hosts.
Need a public endpoint?
If the diagnosis points to blocked ports, CGNAT, or router limits, portwarp exposes your local service without port forwarding.