Do I Need a Static IP Address for Business Broadband?

Last checked: 12 October 2026

You need a static IP address for business broadband if something outside your office has to find your connection at a fixed address: remote access to an office computer or server, CCTV viewed from outside, a site-to-site VPN, a self-hosted website or mail server, or a supplier system that only accepts connections from an approved ("allowlisted") IP. If your business runs on cloud software such as Microsoft 365 and a hosted phone system, you may not need one at all.

This guide explains the difference between a static and a dynamic IP address, when a business genuinely needs one, how multiple-address blocks work, and what to ask a provider before you order.

What is a static IP address?

Every connection to the internet has a public IP address, which is how other systems find it. Vodafone puts the default simply: "IP addresses are usually dynamic meaning a new one is assigned to a device each time it connects to network."

A static IP address is a public address that is reserved for your connection and does not change. Vodafone says its Business Broadband "uses static IP addresses which don't change", and lists the practical benefits as "making it easier to access your computer remotely, host a website, run CCTV".

With a dynamic IP address, your address can change when your router restarts or reconnects. That is fine for browsing, email and cloud apps, because your office is always the one starting the connection. It becomes a problem when someone or something needs to start a connection to your office.

Static vs dynamic IP at a glance

A static IP does not make your broadband faster. It changes how your connection is addressed, not how much bandwidth it has.

When does a business need a static IP?

A static IP is usually worth having if any of these apply:

• Remote access to on-site systems. Staff connect from home to an office PC, a file server or an accounts package that is installed on a local machine rather than in the cloud.
• CCTV, alarms or access control viewed off site. Some recorders and door-entry systems expect a fixed address to connect to. Many newer systems use the manufacturer's cloud service instead, so check the installer's requirements first.
• Site-to-site VPN. Linking two offices, or an office to a data centre, is simpler when each end has a fixed address.
• IP allowlisting. Banks, payment providers, software suppliers and some government or industry portals may only accept connections from addresses you have registered with them.
• Hosting. Running a web, mail or game server from your own premises needs a fixed address so that DNS records keep pointing to the right place.
• Some phone systems. An on-premises phone system connecting to a SIP trunk provider may need a fixed address for security rules. Vodafone also says a static IP "improves the reliability of calls over the internet". Most hosted VoIP services do not require one, so ask your phone provider before paying for it.

When can you manage without one?

You can probably skip a static IP if:

• your files, email and accounting software are all cloud-based;
• your phone system is hosted in the cloud rather than in a box in your office;
• your CCTV or alarm uses the manufacturer's app and cloud service; and
• no supplier has asked you for a fixed address to allowlist.

If one device needs occasional remote access, a cloud-based remote access tool or a dynamic DNS service can sometimes do the job. These rely on a third party, though, so for anything security-sensitive or business-critical, a static IP with proper firewall rules is often the cleaner choice.

Why are static IPv4 addresses limited?

The internet's original address system, IPv4, has a finite number of addresses. The RIPE NCC, which allocates IP addresses in Europe, the Middle East and parts of Central Asia, records that it exhausted its remaining IPv4 pool on 25 November 2019. Organisations without an existing allocation can now only join a waiting list for a single /24 block as addresses are returned.

That scarcity is why providers usually treat a static IPv4 address, and especially a block of several addresses, as a feature that has to be requested. The newer IPv6 system has vastly more addresses, but not every device, router or supplier system supports it yet. BT, for example, notes that static IPv6 does not work on its Business Hub 3 or earlier hubs.

How do multiple static IP addresses work?

Most businesses only need one static IP. If you need to give several devices their own public address, such as a server, a VPN appliance and a CCTV recorder, providers sell blocks of addresses. BT's help pages give two common examples:

• if you pay for 5 static IP addresses, the hub's subnet mask is 255.255.255.248; and
• if you pay for 13 static IP addresses, the subnet mask is 255.255.255.240.

Worked example: why a block of 8 gives you 5 usable addresses

The numbers can look odd, so here is how they work:

1. A 255.255.255.248 subnet mask (written /29) covers 8 IP addresses.
2. The first address identifies the network itself and the last is the broadcast address, so neither can be given to a device. That leaves 6.
3. One of the remaining addresses is used by your router. That leaves 5 for your own devices.
4. A 255.255.255.240 mask (/28) covers 16 addresses. Take away the network, broadcast and router addresses and you have 13.

So if a provider offers "a block of 8" and another offers "5 usable addresses", they may be describing the same thing. Ask for the number of usable addresses when you compare quotes.

Is a static IP a security risk?

A fixed address is easier for anyone to find again, so it should sit behind a properly configured firewall. BT says its Business Hub firewall "will block all unsolicited external access requests", and that you need to open specific ports for a device you want to reach from the internet.

Good practice is to open only the ports a system genuinely needs, keep the devices behind them updated, use strong passwords and multi-factor authentication where possible, and remove the rules when a system is retired. If you are not sure what to open, ask the installer of the CCTV, VPN or phone system for their exact requirements in writing.

What to ask a provider before ordering

1. Is a static IP included with this business broadband package, or is it an add-on?
2. How many usable addresses do I get, and can I add more later?
3. Will the address stay the same if I upgrade my package or move to a new technology, such as full fibre?
4. Is static IPv6 available, and does the router you supply support it?
5. Can I use my own router, and if so, how is the static IP delivered?
6. If I have a 4G or 5G backup connection, will the static IP still work when the backup is in use?

The last question matters because mobile backup connections often use different addressing from the fixed line. Our guide to 4G backup broadband for business covers how failover works.

Frequently asked questions

Does business broadband come with a static IP?

Some business broadband packages include one and others offer it as an extra. Vodafone says its Business Broadband uses static IP addresses. With BT, a single static IP is picked up automatically by the hub with no configuration, and multiple addresses have to be ordered. Through Compare The Networks, static IPs are available with Sky Business Broadband SOGEA; just ask when you request a quote. Always confirm what is included in the quote rather than assuming.

Can I get a static IP on home broadband?

It depends on the provider. Many residential packages use dynamic addresses only. If your business relies on a fixed address, a business broadband package is usually the more dependable route, and it also brings business-grade support. See our business broadband guide for the other differences.

Do I need a static IP for VoIP?

Usually not for hosted VoIP, where the phone system runs in your provider's cloud. An on-premises phone system connecting to a SIP trunk is more likely to need one. Our hosted VoIP guide explains the difference between the two.

Will a static IP make my internet faster?

No. A static IP changes how your connection is addressed, not its speed. If speed or upload capacity is the problem, look at the connection itself, for example leased line vs full fibre.

What is the difference between a public and a private IP address?

Your public IP is the address the internet sees for your whole connection. Private IPs (such as 192.168.x.x) are the addresses your router hands out to devices inside the office. A static IP from your provider is a public address. You can also fix private addresses for printers or servers on your router, but that does not make them reachable from outside.

Sources

• Vodafone Business: What is a static IP and do I need it?
• BT Business: Configure the BT Business Hubs and assign multiple static IP addresses
• RIPE NCC: IPv4 run-out

Related guides

• Business broadband explained
• 4G backup broadband for business
• Leased line vs full fibre
• Hosted VoIP for business
• Business phone and broadband bundles
• Business VoIP phone systems