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Stands forDynamic Host Configuration Protocol

initialismD H C P, letter by letter

What Does DHCP Stand For?

TechNetworkingUpdated Oct 30

What does DHCP stand for? DHCP stands for Dynamic Host Configuration Protocol, the set of network rules that gives each device an IP address and other connection settings automatically. When your laptop joins a home Wi-Fi network and just works, DHCP is usually the reason.

Without it, someone would have to type an address, a gateway and a DNS server into every phone, printer and smart TV by hand, and make sure no two devices shared the same address. DHCP does that bookkeeping in a fraction of a second.

Quick facts

  • Stands for

    Dynamic Host Configuration Protocol

  • Type

    Initialism, said D H C P

  • Job

    Hands out IP addresses and network settings

  • Runs on

    Home routers, office servers, mobile hotspots

  • Key idea

    A lease: the address is borrowed for a set time

  • Related terms

    IP, DNS, LAN, TCP

What does DHCP stand for? The four words

Dynamic Host Configuration Protocol, decoded
LetterWordMeaning here
DDynamicAddresses change as devices come and go
HHostAny device on the network
CConfigurationThe settings a device needs to connect
PProtocolShared steps both sides follow

So DHCP is a rule book for setting up network devices on the fly. It works alongside the Internet Protocol, which uses the addresses DHCP hands out.

How DHCP works in four steps

Network engineers remember the exchange with the word DORA:

  1. Discover: a new device shouts to the whole local network, asking if a DHCP server is there.
  2. Offer: the server replies with a free address it can lend.
  3. Request: the device asks to use that address.
  4. Acknowledge: the server confirms and sends the rest of the settings.

Those settings usually include the IP address, the subnet mask, the default gateway (your router) and one or more DNS servers, which turn web names into numbers.

Leases, renewals and reserved addresses

DHCP does not give addresses away forever. It lends them for a period called a lease, which might last hours or days. Before the lease runs out, the device asks to renew it and usually keeps the same address. If a device leaves and does not come back, its address returns to the pool for someone else.

Sometimes you want a device, such as a printer, to keep one address all the time. Most routers let you set a DHCP reservation, which ties an address to that device's hardware ID. The other option is a static IP, typed in by hand on the device itself.

Office tip sheet: "Printers use reserved DHCP addresses. Do not set static IPs on laptops." This keeps printers easy to find while letting laptops get addresses automatically.

Where DHCP lives on your network

  • At home: your router runs a small DHCP server for your LAN, the network inside your house.
  • At work: a dedicated server often handles DHCP for hundreds of devices.
  • On a phone hotspot: the phone acts as the DHCP server for the laptop you connect.
  • At your provider: your ISP may use DHCP to give your router its public address.

When DHCP goes wrong

A few error messages point straight to a DHCP problem:

  • "DHCP is not enabled" means the device is set to use a manual address. Switch it to automatic.
  • An address starting with 169.254 usually means the device could not reach a DHCP server and gave itself a placeholder.
  • "IP address conflict" means two devices ended up with the same address, often because one was set by hand.

Restarting the router, or turning the device's network connection off and on, often fixes these by starting the DORA steps again.

How to say and write DHCP

Say each letter: "dee aitch see pee." In print it is all uppercase and never dotted, and it follows a: "a DHCP server." You will also see the term as part of other words, such as DHCP lease, DHCP pool and DHCP relay. For more networking letters like TCP, visit our tech acronyms section.

Questions people ask

Should DHCP be on or off?

For almost all home users, leave it on. It lets every device join the network without manual setup. Turn it off only if another device is already acting as the DHCP server.

What is the difference between DHCP and a static IP?

With DHCP, a server lends the address automatically. With a static IP, you type a fixed address into the device yourself.

What is the difference between DHCP and DNS?

DHCP gives a device its address and settings. DNS translates names like a website address into the numbers computers use to find each other.

What does DHCP lease time mean?

It is how long a device may keep its borrowed address before it must renew. Devices renew on their own, so you rarely notice.

How do you pronounce DHCP?

Say the four letters separately: "D H C P." Network folks never blend those four letters into one word.