Use `nc` (netcat) to check UDP port connectivity
Use `nc` (netcat) to check UDP port connectivity

Core Concepts UDP is a connectionless protocol. Unlike making a phone call (TCP), it’s more like sending a postcard (UDP). You send it, but by default, you don’t receive any acknowledgment. Therefore, the most reliable way to test a UDP port is to: run a listening service on the target port, then send a “postcard”... » read more

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TCP handshake delay check
TCP handshake delay check

Network Quality TCP handshake delay check Establishes a TCP connection, records the handshake time, and immediately disconnects. It does not involve application layer protocols, making it suitable for testing network latency of Layer 4 services such as game gateways and databases. python3 -c " import socket import time host = 'api.example.com' port = 3250 print(f'Testing... » read more

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ethan