A no-nonsense toolbox for network and server admins — subnet maths, MAC lookups, and config generators for iptables, ISC DHCP and nginx. Nothing is sent to a server; everything runs locally in your browser.
Enter an IPv4 address and a subnet mask or CIDR prefix. Get the network address, broadcast, usable host range, host count, wildcard mask and more.
Paste a MAC address (any common format) to find the manufacturer from the IEEE OUI registry. The vendor database loads on first lookup.
Tick the features you need and add rules. Generates iptables commands for filter (INPUT/OUTPUT/FORWARD) and NAT (masquerade / port-forward), plus a note on making them persistent.
Build a dhcpd.conf for the ISC DHCP server. Set global options, add one or more subnets with ranges, and optional static host reservations.
Generate an nginx server { } block. Pick a site type and options; produces a ready-to-drop-in config.
sudotools.dev is a free collection of everyday utilities for system and network administrators. Every tool runs entirely in your browser — your inputs (IP addresses, configs, MAC addresses) are never sent to or stored on any server. Bookmark it, share it, and if something's missing that you'd find useful, that's the plan: more tools are on the way.