I would like to crawl an IP Range, eg an entire country. Can I do this easily with phpcrawl?
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Yes and no ;)
Of course you can loop over a list of IPs and start a crawling-instance for every IP.
But in most cases you wont't get any proper content from webservers if you use the IP as host/domainname (which has nothing to do with phpcrawl, just a general fact).
The server of alternate.de (just came into my mind) has the IP 126.96.36.199.
But if you do a http-request for http://188.8.131.52, you don't get anything from the server (just try in you browser), because the hostname is missing in your request.