July 9, 2025
Picking uncontested private IP subnets with usage data blog.benjojo.co.uk
If the device you are reading this on has an IPv4 address, it is very likely not a publicly routeable one. This is because the wide scale deployment of NAT and RFC1918 space has ensured that billions of devices (for better or worse) are addressed using a small set of “private” IPv4 addresses that are then translated on the way out to the wider internet with universally addressable ones.
Nice observation; I'll certainly take more care choosing an IP range for a future private network. Luckily I've already chosen a random 192.168.x.x segment for most of the networks I've built.
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