How to Purchase a Static IP Address

By Eoghan McCloskey

Learn how to purchase a static IP address.
i wireless home network image by jaddingt from

Internet Service Providers (ISPs) typically provide Internet service to customers using either a dynamic IP address or a static IP address. A dynamic, or DHCP (dynamic host configuration protocol), network uses a "stack" of available IP addresses for each customer. When the customer's modem comes online, it obtains the first available IP address off of the stack and uses that address to browse the Internet. Thus, a modem may use a slightly different IP every time it goes online. A static IP address is just the opposite---one specific IP address is assigned to each customer and the modem always uses that exact IP address to go online. If you determine that you need to use a static IP address on your Internet connection, here are a few things to consider before contacting your ISP to order a static IP.

Determine what you need to use your static IP for. Most ISPs charge an extra fee for static IP addresses, so make sure that the use of a static IP is necessary. VPNs (Virtual Private Networks), which employees use to work from home, for instance, commonly require a static IP. Not all of them do; contact your employer's IT department to settle any confusion. There are many other uses for a static IP as well. The point is just that since static IPs cost money, make absolutely sure you need one rather than wasting money on something for which a standard dynamic IP would suffice. If you are sure you do need a static, consider what device should use it.

Determine what device you will have your ISP provision a static IP address to. If you need your static IP address assigned to your modem, your ISP will most likely have the modem's MAC address on file. If you are provisioning your static IP to a networking device like a router, switch, or hub, determine that device's MAC address (typically printed on a sticker on the device itself). A static IP can also be provisioned to a computer; determining the computer's MAC address is a bit more involved (skip step 3 if you are not assigning the static to a computer).

Determine the computer's MAC address. For Windows computers, navigate to the DOS command prompt (Start-->All Programs-->Accessories-->Command Prompt or Start-->Run--->CMD) and type the command "ipconfig/all" into the DOS window. Among the command output you will see "Physical address" with a string of numbers and letters off to the right. Those numbers and letters are your computer's MAC address.

For Apple computers, navigate to the "Network" System Preferences icon (System Preferences--->Network). Select your active connection (typically labeled "Built-in ethernet") and click either "configure" or "advanced," depending on what version of Mac OSX you are using. Listed next to "Ethernet ID" is the computer's MAC address (you may have to additionally click on the 'Ethernet' tab in older versions of OSX). Once you have determined the MAC address of the device that is going to use the static IP, it is time to contact your ISP.

Purchase a static IP address. Contact your ISP's customer service department. If you have the MAC address of a device other than the modem that the static will be provisioned onto, make sure to give this information to the customer service rep before completing your order. Also be sure to ask the salesperson how long the provisioning of the static will take and if you will need to reset any of your equipment in order for the network to assign the static IP to your home Internet connection.