NetworkActiv PIAFCTM
Easy yet advanced, quad-mode packet analyzer, Mode 1 (Packet Interceptor) While in this mode, PIAFCTM captures and analyzes network data packets. PIAFCTM allows you to view special information encoded in each packet such as the source and destination IP addresses, the source and destination... With PIAFCTM, you can filter the capturing of packets by IP address, port, packet size, protocol, and/or text-sub-string searching of each packet's content. ... Also, you can search for a text-sub-string within the current list of packets, save the list of packets to a text file, view the data...
http://www.networkactiv.com/NetworkActivPIAFCTMv2.2.exe - 2Mb - Download - Screenshot