howto/Getting-started.md
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To register an IPv4 network prefix, simply create an `inetnum` object.
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-You may choose your network prefix in one of the currently open netblocks. There is also a [graphical visualisation of the assigned ranges](http://dataviz.polyno.me/dn42-netblock-visu/registry.html).
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+You may choose your network prefix in one of the currently open netblocks. You can get a list of unassigned subnets here: [Open Netblocks](http://dn42.netrik.de/frips/), please mind the allocation guideline. There is also a [graphical visualisation of the assigned ranges](http://dataviz.polyno.me/dn42-netblock-visu/registry.html).
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