Many people use sites like or to identify the public IP address of an unfamiliar network.

Telnet to or if you do not have a web browser (router, switch, linux).
Note: the original domain name was but it has not worked for a while.

[josh@webserver ~]$ telnet
Connected to
Escape character is ‘^]’.
This is the telnet autoresponder at
You have connected over IPv4.
Your IP address is
Connection closed by foreign host.

Bit-Twist is a simple yet powerful libpcap-based Ethernet packet generator. It is designed to compliment tcpdump or wireshark packet captures. In this tutorial, you will learn how to edit and replay network packet captures files on a live lab network.