tcp

Display and control your Android device

Packet Sender is a free utility to allow sending and receiving TCP, UDP, and SSL (encrypted TCP) packets on the ports of your choosing.

A modbus TCP and RTU master and slave tool with import and export functionality.

A TCP, UDP, and SCTP network bandwidth measurement tool.

Ping using TCP instead of ICMP. Outputs in colored, plain, JSON, CSV, and sqlite3 formats.

An Ethernet based virtual Zebra Label Printer that can be used to test applications that produce bar code labels. This application uses the Labelary service found at http://labelary.com.

A simple layer 4 ping tool for cloud.

Network diagnostics tools for pinging, scanning, and analyzing hosts

Professional all-in-one terminal, sniffer, and protocol analyzer.

CLI and TUI for listing listening TCP and UDP ports

Cross-platform netcat — TCP/UDP send/receive, port checks, TLS clients.

多协议网络调试工具

Open-source TCP-client with tab feature for mulitple connections and a list of saved connections.

Lightweight TCP port monitoring alert tool for Windows.

PingDD is a cross-platform TCP “ping” tool written in C.

See every port in use, and take one back with a click.

It is a multi-threaded ICMP, Port, IP, NetBIOS/NetBT, ActiveDirectory and SNMP scanner with many advanced features.