A delegated internet protocol version six prefix, which is assigned to a gateway device which is interposed between an internet and a premises, is divided into a lower-numbered portion and a higher-numbered portion. One of the portions is allocated to a plurality of networks associated with the premises. The other is broken into a plurality of blocks for use in prefix delegation for allocation to routers associated with the premises requesting the prefix delegation. The gateway device is operated in accordance with the dividing, allocating, and breaking steps. Optionally, at least some of the plurality of networks associated with the premises are pre-categorized into at least first and second trust zones, and the operating step further includes operating the gateway device in accordance with the pre-categorizing step. Apparatuses, devices, computer program products, and internet protocol version four embodiments are also provided.
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