Free network tools

Small tools we use ourselves when setting up servers. Free, no sign-up, nothing stored.

Open port checker

See your public IP address and test whether a TCP port on your own connection can be reached from the internet. Useful for port forwarding, game servers, SSH and spotting CGNAT.

WireGuard config generator

Make a server wg0.conf and client configs with fresh keys and preshared keys. Keys are generated in your browser and never sent to us.

IPv6 subnet calculator

Enter an IPv6 address and prefix to see the network, the first and last address, the number of addresses and how many /64s fit.

Why a hosting company makes free tools

These are the questions our customers ask most while setting up a server: is my port open, how do I write a WireGuard config, how big is a /80. If a tool helps you, natbox runs small Linux servers with root SSH and a routed /80 of IPv6 from $1.00 a month. See our plans or the guides.