This code runs on appengine and provides a simple IP lookup service for my machines.

gnu_crawl.py

#!/usr/bin/env python
"""
This link below is where to get a list of Gnutella web caches
http://gwebcaches.pongwar.com/gnutella.html

This is an example of how to obtain a list of Gnutella nodes
curl 'http://gwc.gofoxy.net:2108/gwc/cgi-bin/fc?hostfile=1'

"""

import socket, sys

socket.setdefaulttimeout(5)
request = ("GNUTELLA CONNECT/0.6\r\n"
           "User-Agent: LimeWire (crawl)\r\n"
           "X-Ultrapeer: False\r\n"
           "Query-Routing: 0.1\r\n"
           "Crawler: 0.1\r\n\r\n")

def main():
    peers = [line for line in open(sys.argv[1])]
    for peer in peers:
        try:
            makecall(peer, peers)
        except Exception as ex:
            print "FAILED ", peer, ex

def makecall(endpoint, peers):
    host, port = endpoint.strip().split(':')
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.connect((host,int(port)))
    sock.send(request)
    response = sock.recv(4096)
    sock.close()

    print response
    for line in response.split('\n'):
        if line.startswith('Peers'):
          peers = peers + line[7:].split(',')
        elif line.startswith('X-Try-Ultrapeers'):
          peers = peers + line[18:].split(',')

if __name__ == "__main__":
    main()