This is from the FAQ, Connection Problems :

3 You can download a large phex.hosts file from the Phex developers site at Sourceforge
Just place this file into your phex directory where your phex.cfg is located and also raise the value mNetMaxHostToCatch in your phex.cfg file to 3000 or higher.

At gnutella uk they also have a hosts file, they call it a gnutella.net file.
You can copy the adresses from that file and replace the adresses in your phex.hosts file (use a tekst editor like notepad to open your phex.hosts file)

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Het algemeen gnutella forum in Nederlands