TCP/UDP debugging tool

Create client & server. Send & receive packets.
Tunnel connections, decrypt SSL/TLS and analyze handshake.
Sniff network traffic and analyze TCP streams.

No installation required.
Single .exe is everything you need.
Capture & Inspect
  • Capture virtually unlimited amount of packets
  • Export captured raw data (drag selection to file)
Create TCP/UDP server
  • Bind to any local IP
  • Supported IPv4/IPv6 dual stack
  • Allow reuse same address & port
Connect to remote host
  • Specify source address
  • Broadcast or join multicast groups
Rewrite traffic
  • Replace matched content
  • Match arbitrary data in binary mode
SSL/TLS client & server
  • Supported SSL/3.0, TLS/1.0, TLS/1.1, TLS/1.2
  • Send custom Server Name Indication (SNI)
  • Create certificates and self-signed CA
  • Auto generate server certificates based on SNI
  • Export negotiated certificate chain
  • Observe SSL/TLS client & server hello messages
  • Request or send client certificate
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