Automatic or manual? This one decision decides whether your printer 'disappears' every few weeks or stays put for years. Here is what DHCP really hands out, what static really costs, and the rule technicians follow.
Most network settings screens offer two choices — obtain automatically, or type it yourself. It looks like a matter of taste. It is not. Each choice fails in its own predictable way, and choosing correctly per device prevents the most common office network complaints.
☝️ You never typed any of this. DHCP delivered all four values the moment the PC joined the network.
DHCP is a service, usually running on your router, that hands a joining device everything it needs: an IP address, the mask, the gateway and DNS. The device asks, the receptionist assigns a free room, and the stay is recorded with an expiry — the lease.
Before the lease expires, the device quietly renews it and keeps the same address. That is why your laptop's address usually stays stable for weeks even though it is 'automatic'. Addresses only change when a device stays away past its lease, or the router restarts and starts fresh.
A static IP is typed in by hand and never changes. No asking, no lease, no surprises. The cost is responsibility: you must choose an address that fits the street, does not collide with anyone, and has the correct mask, gateway and DNS typed alongside it. One typo and the device is stranded while looking perfectly configured.
The middle path professionals prefer is a DHCP reservation: the router always gives the same address to the same device. The printer keeps its number forever, but the setting lives in one place — the router — instead of being typed into the device.
If a PC set to DHCP shows an address starting with 169.254, DHCP never answered. Windows invented that fallback address (APIPA) so the PC could still talk to other stranded PCs, but it cannot reach your router or the internet. Read it as a message: I never received my room. Check the cable, the Wi-Fi connection and whether the router is alive before touching any IP settings.
In the video you can watch a PC receive its full configuration from DHCP — no typing at all. See it once and the automatic option makes sense.
▶️ Watch Full VideoFour things in one lease: an IP address, the subnet mask, the default gateway and a DNS server address. That is why a PC set to 'obtain automatically' works the moment it joins a network, with nothing typed by anyone.
Devices that others connect to: printers, servers, CCTV recorders, NAS storage and attendance machines. Their address is saved in other people's PCs and apps, so it must never change. Normal user PCs, laptops and phones are better on DHCP.
No. It means the PC asked DHCP for an address and got no answer, so Windows gave itself a fallback address. That PC cannot reach the router or internet. Check the cable or Wi-Fi link and the router first — the IP settings are the messenger, not the problem.