Subnetting a /24

Broadcast and Host Range

A subnet has endpoints, not just a starting address. This lesson shows the network, first host, last host, broadcast, and usable count in one checked row.

highlighted = computed this step

Why ranges matter

A subnet is useful only when the endpoints are known. The table recomputes the usable range and the broadcast address from the network and prefix.

/26/26

Broadcast and host range

The network 192.168.1.128/26 has first host 192.168.1.129, last host 192.168.1.190, broadcast 192.168.1.191, and 62 usable hosts.

192.168.1.128/26→192.168.1.191192.168.1.128/26\to192.168.1.191
One subnet rangeThe row recomputes first host, last host, broadcast, and usable hosts.One /26 range/26 split to /26networkfirst hostlast hostbroadcastusable192.168.1.128/26192.168.1.129192.168.1.190192.168.1.19162

Why broadcast is high

Broadcast sets every host bit to one, which is network OR the inverted mask. The usable endpoints stay between network and broadcast.

usable=62\text{usable}=62
One subnet rangeThe row recomputes first host, last host, broadcast, and usable hosts.One /26 range/26 split to /26networkfirst hostlast hostbroadcastusable192.168.1.128/26192.168.1.129192.168.1.190192.168.1.19162

Summary

A subnet row is arithmetic: network, first host, last host, broadcast, and usable count are recomputed together. Address arithmetic only; timing/throughput is not modeled here.

usable=62\text{usable}=62
One subnet rangeThe row recomputes first host, last host, broadcast, and usable hosts.One /26 range/26 split to /26networkfirst hostlast hostbroadcastusable192.168.1.128/26192.168.1.129192.168.1.190192.168.1.19162