TCP/IP Builder

Windows Socket testing tool


TCP/IP Builder is a Windows Socket testing tool. You will be able to create a socket manually, connect it (or listen for connections), send and receive data through it.

You may setup local IP and Port, TCP/UDP protocol, keep alive, out-of-band data, DNS Resolver, System info, on-line help, RAW Packet Detail.

TCP/IP Builder

New in 1.9.1

  • Updated project to newer Windows versions.


  • Act as client or server.
  • Select local IP address and port.
  • Listen on any given IP and port, and reuse address if needed
  • Build TCP or UDP sockets.
  • Detect remote IP address and port on incoming UDP packets.
  • Send and receive normal and Out of Band data.
  • Use ‘keep-alive’, ‘no-delay’ and ‘broadcast’ socket options.
  • View incoming data in Hexadecimal representation.
  • Send arbitrary bytes by writting its ASCII number.
  • ASCII parser option for writting bytes in the format 0x<nn> (i.e: 0x4F)
  • Resolve IP addresses usign DNS.
  • IP, Protocol, Port and send flags configuration is persistent now.
  • TCP/IP Builder is open source, under GNU General Public License.


Builder.msi - TCP/IP Builder 1.9.1

Download and execute Builder.msi

Get source code

Other stuff

TCP/IP High-Level Protocol Debugging - Part 1 - TCP/IP Builder Related document.

TCP/IP High-Level Protocol Debugging - Part 2 - TCP/IP Builder Related document.