Insights

What is a static vs. dynamic IP address?

Insights overview

Choosing the right IP address configuration is a foundational decision in your network architecture, directly impacting security, reliability, and cost. Every device connected to the internet, from a massive data center server to an employee's laptop, needs a unique identifier to send and receive information. This identifier is its Internet Protocol (IP) address. 

Without this unique address, data packets sent via the TCP/IP protocol suite wouldn't know their destination, and your requests for websites or files would get lost. The method by which this address is assigned is what separates one type from another.

The two primary types of IP addresses assigned to devices are static and dynamic. While they both serve the same fundamental purpose of identification, their assignment, persistence, and ideal use cases are vastly different. This article will explore these differences to help you make the right choice for your business needs.

In this article

What is an IP address?

An IP address is a unique numerical label assigned to each device participating in a computer network that uses the Internet Protocol for communication. Its primary function is to handle network interface identification and location addressing. Essentially, it tells data where to go.

How IP addresses enable communication

When you access a website, your computer sends a request from its IP address to the server's IP address. The server then knows the exact "return address" to send the website's data back to. This entire exchange is governed by the TCP/IP (Transmission Control Protocol/Internet Protocol) model, the foundational communication language of the internet.

IPv4 vs. IPv6

There are two versions of IP in common use today: IPv4 and IPv6. IPv4 addresses (e.g., 192.168.1.1) are more common but are being depleted, while IPv6 was created to provide a virtually limitless supply of unique addresses. Regardless of the version, the core function as a unique identifier remains the same.

The key distinction we will explore is not the format of the address itself, but how it is assigned and how long it lasts. This is the fundamental difference between a static and a dynamic IP address.

Defining static IP addresses

A static IP address is a fixed, unchanging address that is manually assigned to a device. Once an IP address is assigned to a server or computer, it stays the same until it is decommissioned or reconfigured. This consistency is its greatest strength.

Why static IPs matter in business environments

Internet Service Providers (ISPs) typically offer static IP addresses as a premium service for businesses. Within a corporate network, an IT administrator can assign static IP addresses to critical infrastructure like servers, printers, and network gateways to ensure they are always reachable at the same location.

Use cases that demand permanence

This reliability is non-negotiable for services that must be consistently available. If you host your own website, email server, or a business VPN, you need a static IP. It ensures that domain names always point to the right server and that remote employees can always connect to the company network.

Static IPs and reliable remote access

Static IP addresses are especially valuable when devices need to be accessed remotely on a recurring basis. A fixed address ensures that IT teams and remote tools can always locate the same machine without relying on dynamic updates or DNS workarounds. Features such as remote wake-up, VPN connections, or remote administration are far more reliable when the destination endpoint never changes.

Defining dynamic IP addresses

A dynamic IP address is a temporary address that is automatically assigned to a device each time it connects to a network. This process is managed by a DHCP (Dynamic Host Configuration Protocol) server, which maintains a pool of available IP addresses.

How DHCP assigns and reuses addresses

When a device connects—for example, an employee's laptop connecting to the office Wi-Fi—it requests an IP address from the DHCP server. The server leases one of its available addresses to the device for a specific period. When the device disconnects or the lease expires, the IP address is returned to the pool for another device to use.

Why dynamic IPs are the default

This automated system is highly efficient and cost-effective, which is why it is the default for most ISPs and internal corporate networks for client devices. It eliminates the need for IT staff to manually configure every single computer, smartphone, and tablet, which is an unmanageable task in a large business.

Limitations for hosting and remote access

While dynamic addresses are perfect for client devices that only need to consume content from the internet, their changing nature makes them unsuitable for hosting services. A domain name or remote access tool can't reliably find a server if its address is constantly changing.

Static vs. dynamic IP: A head-to-head comparison

Understanding the key differences between these two types of IP addresses is crucial for designing a network architecture that meets your business objectives. Here’s a direct comparison across several critical factors.

Reliability and remote access

Static IP:

 Extremely reliable for hosting and inbound connections. Since the address never changes, DNS records remain accurate, and services like web servers, email servers, and corporate VPNs are always accessible.

Dynamic IP:

Unreliable for hosting services. The changing address makes it difficult for external users and systems to consistently locate the device. While services like Dynamic DNS (DDNS) exist, they are a workaround and not as robust as a true static IP.

Security

The security implications are nuanced, and a common misconception is that one is inherently more secure than the other.

Static IP:

A fixed address presents a constant target for potential attackers. It's easier for a malicious actor to focus their efforts on a known IP. However, this also makes it easier to implement precise firewall rules, IP-based access controls, and monitoring, allowing you to protect your assets effectively.

Dynamic IP:

The changing address can offer a minor degree of obscurity, making it slightly harder for an attacker to target a specific end-user device over time. However, this does not protect against broader threats like phishing or malware. The overall threat landscape requires a comprehensive security strategy beyond just the IP type.

 

 

Cost and management

Static IP:

These almost always come at an additional cost from an ISP. Internally, they require careful manual configuration and record-keeping to avoid IP address conflicts, where two devices are mistakenly assigned the same address.

Dynamic IP:

This is the standard, cost-effective option included with most internet plans. Management is automated via DHCP, significantly reducing the administrative burden on IT teams, especially in large environments.

Which IP address type is right for your business?

Whether a static or dynamic IP address is better depends entirely on what the device is used for. There is no universally “best” option; the right choice is the one that fits the business purpose.

Use this checklist to determine the appropriate configuration for your assets:

You should use a static IP address for:

  • Web servers: If your company hosts its own website, a static IP is mandatory so your domain name can consistently point to it.
  • Email servers: For reliable sending and receiving of company email, a static IP is essential for your mail server's DNS records (MX, SPF).
  • Corporate VPNs: To allow remote employees to securely connect to the internal network, the VPN gateway must have a fixed, predictable address.
  • VoIP and Communications: Hosted phone systems and other real-time communication services often require static IPs for stability and quality of service.
  • Network hardware: Critical infrastructure like routers, switches, firewalls, and printers should have static IPs for stable internal management.

You should use a dynamic IP address for:

  • Employee workstations: Laptops and desktops used by employees for daily tasks (email, browsing, office apps) do not need a static IP.
  • Mobile devices: Smartphones and tablets connecting to the company Wi-Fi are perfect candidates for dynamic IP assignment.
  • Guest networks: Providing internet access to visitors via a guest Wi-Fi network should always be done using dynamic IP addresses for simplicity and security segmentation.
  • General-purpose IoT devices: Most IoT devices that only send data out and don't require inbound connections can operate efficiently with dynamic IPs.

Key differences at a glance

To quickly summarize the core distinctions, consider these points:

  • Assignment: A static IP is assigned manually and is permanent. A dynamic IP is assigned automatically by a DHCP server and is temporary.
  • Cost: Static IP addresses are typically a premium add-on service from an ISP. Dynamic IP addresses are the standard, cost-effective default.
  • Primary use case: Static IPs are for servers and services that need to be consistently reachable (hosting, VPNs). Dynamic IPs are for client devices that consume services (laptops, phones).
  • Reliability for hosting: A static address is highly reliable for inbound connections. A dynamic address is unreliable because it changes unpredictably.
  • Management: Static IPs require careful IT management to avoid conflicts. Dynamic IP management is automated, simplifying network administration.

Choosing the right IP strategy involves a split approach. Your business will almost certainly use both: static IPs for your critical, always-on infrastructure and dynamic IPs for the vast majority of your end-user client devices. This hybrid model provides the best balance of reliability, manageability, and cost-effectiveness for the modern enterprise.

Making the right connection

The choice between a static and dynamic IP address is not a minor technical detail but a strategic decision that underpins your network's performance and reliability. Static IP addresses provide the stable foundation required for servers, VPNs, and other critical services. In contrast, dynamic IP addresses offer the efficiency and scalability needed to manage fleets of client devices. By applying the right type of IP address to the right function, you create a more robust, secure, and manageable network architecture.

Ready to ensure your remote access and support capabilities are as reliable as your network? Explore TeamViewer's enterprise solutions today to build a seamless and secure remote workplace.