Separate public and local addresses
A public address identifies the internet connection externally; private addresses identify devices within the local network. Making a printer's local address stable does not require buying a public static address.
Use reservations where suitable
A router's DHCP reservation can keep a device on a consistent local address. Follow model guidance and avoid conflicting manual assignments. The useful choice depends on how the device and router are managed.
Consider remote access carefully
A public static address may simplify some approved services but is not a security measure. Carrier-grade NAT and provider restrictions also matter. Check supported remote-access alternatives before opening incoming connections.
Avoid changes without a need
Ordinary browsing usually does not require a personally purchased static public address. Confirm service requirements, fees and recovery details before changing settings; wrong addressing can interrupt local connectivity.
Questions about this guide
Is a router reservation the same as a static public IP?
No. A reservation keeps a local device's address consistent on your home network; a public address belongs to the internet-facing connection. Ask which one the task actually needs.
Should I pay for a static public IP to fix weak WiFi?
That addresses a different problem. Weak coverage concerns the local wireless link, so identify the reason for a fixed public address before changing your internet plan.