A port probing script that attempts to identify protocols and gain maximum information from minimal interaction.

Example (buffers truncated for clarity):
$ cat testfile.txt
130.239.18.160:6667
63.245.215.46:21
74.125.225.168:80
$ python portprobe.py -f testfile.txt --json -o out.txt
Probing 130.239.18.160:6667
Probing 63.245.215.46:21
Probing 74.125.225.168:80
$ cat out.txt
{"buffer": ":solenoid.oftc.net NOTICE AUTH :*** Looking up your hostname...\r\n", "ip": "130.239.18.160", "protocol": "irc", "port": 6667}
{"buffer": "220-\r\n220-   ftp.mozilla.org / archive.mozilla.org - files are in /pub/mozilla.org\r\n", "ip": "63.245.215.46", "protocol": "ftp", "port": 21}
{"buffer": "HTTP/1.0 200 OK\r\nDate: Wed, 11 Sep 2013 18:47:15 GMT\r\n","ip": "74.125.225.168", "protocol": "http", "port": 80}