howto/Getting-started.md
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@@ -78,7 +78,11 @@ If unsure, ask on the mailing list or IRC.
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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. You can get a list of unassigned subnets here: [Open Netblocks](http://dn42.netrik.de/), 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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+You may choose your network prefix in one of the currently open netblocks. You can get a list of unassigned subnets on the following sites, please mind the allocation guideline below.
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+ * http://core1.darmstadt.ccc.de/free/data.json
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+ * [Open Netblocks](http://dn42.netrik.de/)
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+ * [graphical visualisation of the assigned ranges](http://dataviz.polyno.me/dn42-netblock-visu/registry.html).
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