Peace of mind with
secure UK Colocation

As a Tier-3 colocation provider 4D offers full racks, half racks and quarter racks across the South-East with UK data centres in Surrey, Sussex, Kent, London and beyond. A reliable, secure, and resilient environment for your hardware.

Data Centre Checklist


Access cutting-edge colocation for your IT

Colocation allows you to host your IT in a data centre. Our colocation data centres provide increased resilience, reliability and a highly secure infrastructure designed to be the ideal environment for your IT. Unlock new potential with colocation as part of your digital transformation strategy.


We at 4D are proud to operate people-focused data centres. Our highly qualified Sussex and Surrey-based engineers will do everything they can to support our clients with award-winning infrastructure management. Our data centres are staffed 24/7/365 for monitoring, maintenance and security to guarantee 100% power uptime, and 99.999% network uptime.


Trusted colocation since 2007

  • Support & guidance 24/7/365
  • Access to expert senior-level technical engineers
  • 100% UK-based & independently owned
  • Tier-3 rackspace facilities suitable for high-performance computing
  • 99.999% network uptime reliability and NEVER had a power failure
  • Environmentally-friendly with industry leading energy efficiency


4D - Peek Inside Gatwick Open Day - April 2020 v6


Nothing beats seeing our facilities for yourself



Maintaining top levels of physical security across our data centres

Our colocation facilities are highly secure to minimise risk and maximise operational uptime, adapting as changes occur in how we live and conduct business, giving all our customers – from healthcare to banking – confidence that their data is protected.

  • CCTV covering inside and outside of the data centres
  • ID and/or biometric confirmation required for all visitors
  • Locked internal doors to control movement through the data centre
  • Gated access to the car park
  • 24/7/365 on-site staff so your servers are never unattended
  • Racks are locked with keys, codes or biometrics so only you have access

Colocation FAQs

What is colocation and what are its benefits?

Colocation allows you to host servers and other IT equipment in a data centre. This is a feasible alternative to building your own, and there are many benefits to hosting your IT in a data centre:

  • Resilience and redundancies: Data centres are equipped with power, cooling, and network redundancies keeping your system online and preventing downtime.
  • Lower costs: Thanks for the efficiency of data centres, their operating costs per rack are a lot lower than in-office setups, a saving they pass onto their customers.
  • Room to grow: Getting your servers out of your office frees up more space for desks, and your data centre will handle all things infrastructure when it’s time to expand.
  • Secure: With comprehensive physical and cyber security offerings, your data is totally protected when it’s in a data centre.
  • Connectivity options: Data centres provide carrier-neutral internet connections, which guarantees speed and flexibility. You can also have your system interconnected to other data centres or connected directly to your office with a leased line.
What protection against power failures are in place?

Uninterruptible Power Supplies (UPS) are effectively large batteries that power the data centre and are constantly recharged by the mains electricity supply. This means that when there is a mains failure, the UPS is already in place to keep your servers powered, preventing downtime and potential damage from a sudden shutdown.

Additionally, data centres are equipped with generators to keep themselves powered indefinitely beyond the capacity of the UPSs.

Read our Beginner's Guide to UPS

Is colocation secure?

One of the biggest advantages of data centres is that they are totally secure and will protect your IT and your data from cyber-attacks, giving you peace of mind.

When can my engineers access my servers in colocation?

As a customer you will have 24/7 access to your servers to perform maintenance of repairs. This gives you the opportunity to schedule maintenance outside of office hours, and to repair issues with your hardware immediately, even if they appear in the middle of the night.

Can colocation services be integrated into a hybrid system?

Since data centres are equipped with powerful network infrastructure, your IT hosted in a colocation service can be connected to your other platforms, allowing you to build a hybrid system while taking advantage of colocation services.

As a provider of cloud services, 4D can offer fast and flexible Virtual Machines that can be connected into your physical hardware colocated in one of our data centres through a dedicated cross-connect.

Hybrid IT with cloud and colocation in one place has several advantages:

  • Adaptability – even if you have secure system you need to keep on private hardware, you still have scaling capacity if there’s a sudden change in demand
  • Additional security - you know exactly where your cloud solution and all of your data is located
  • Speed - a dedicated cross-connect will ensure real-time speeds between your cloud platform and collocated servers
  • Cost savings – no need for costly new network infrastructure as you don’t have to send the data from your rack over the internet to your cloud solution

Why hundreds of organisations like yours trust us with their data

  • Zero power outages and network 99.999% uptime
  • 100% UK customer service 24/7
  • ISO 27001:2013 certified
  • Microsoft & Cisco certified engineers
  • PCI:DSS security compliant


  • ISO 27001:2013 certified
  • Tech UK DC council members
  • On G-Cloud & HSCN connected
  • NHS approved data centre

SLA Key Facts

  • 100% uptime on power
  • 99.999% network uptime
  • 24/7 UK phone & email support
  • 24/7 facility monitoring


  • 24/7 SIA qualified security
  • Physical & biometric security
  • Automatic fire suppression systems
  • Private vLANs for network traffic

24/7 UK Support

We offer 24/7 support from our team of highly qualified Sussex and Surrey-based engineers as standard. So, when you need help we’re immediately available on the phone, by email or through our online ticketing system.


Additional services

Data Centre Interconnects

Dedicated UK fibre network, Transparent, layer-2 connection

Our dedicated UK fibre network provides a transparent, layer-2 connection (with full support for 802.1q / QinQ vLANs) between any of our on-net locations.

Connections are provisioned across our core network and a backup route is provided as standard. This means that should the primary route fail due to a fibre break or equipment failure then your connection will re-route, almost instantly, through another path on our network ensuring your data can still get through.

Benefits of a data centre interconnect from 4D

  • Expand your network to new sites quickly and cost-effectively
  • Benefit from temporary connectivity between sites when migrating
  • Reduce leased line costs by connecting to a PoP close to your office
  • Save on bandwidth costs; compared to using Internet traffic and VPN tunnels
  • Connect to customers in remote locations
  • Connect to private peering partners or third-party carriers in remote locations
  • Choose from the following port speeds: 10Mbps, 100Mbps, 1Gbps, 10Gbps
  • Run your own VLAN tags with no intervention from us

Optional features

  • Setup and on-going management of switches
  • Setup and on-going management of your own dedicated firewall
  • Managed security services (access controls, VPNs, intrusion prevention and anti-virus/anti-spyware)
  • QoS (Quality of Service)
  • Separate back-up circuits with failover for resilience
  • Point-to-Multipoint

Get a Quote

Data centres that we're directly connected to

A list of the 4D connected data centres is below. We also have the potential to connect to many other data centres through our partners.

  • 4D Surrey
  • 4D Gatwick
  • Telehouse North
  • Telehouse East
  • Equinix
  • Digital Realty Meridian Gate
  • Custodian Data Centres

You can also see the carriers we connect to on our high-level network map:


IP Transit

Full transit and partial transit, IPv4 and IPv6 supported

What you get

There are two options for IP transit; the first being ‘full transit’ and the second being ‘partial transit’:

Full transit provides you with all the routes available on the internet ensuring delivery of your IP traffic to and from every location.
Partial transit, on the other hand, includes just peering connections, which are the routes learnt from other networks that we peer with both privately and on exchanges such as Lonap or LINX.

You also get

  • IPv4 and IPv6 supported (dual stack)
  • multiple tier-1 carriers and peering exchanges
  • fully-resilient Cisco ASR based network
  • over 40 Gbps of current network capacity
  • 99.999% uptime SLA
  • and it's available in all 4D and major third party London data centres

How it works

Our IP transit services are fed directly from our Cisco ASR-based core network which has over 40 Gbps of capacity. We provide a multihomed feed of routes from Tier 1 carriers such as GTT, NTT and Telecom Italia, as well as peering routes on Lonap and LINX exchanges.

Transit is available in any of our on-net locations and is backed by our 99.999% uptime SLA.

Our network map includes a high-level representation of our core network and our connections to IP transit providers:


How much it costs

Costs are dependent on the quantity of IP transit required (in Mbps) and the location where it needs to be supplied.

Please contact us on 020 7183 0602 and one of our network specialists can put together a quote for you.

Why 4D?

  • owner-operators of tier-3 data centres
  • one of the fastest growing networks in the South
  • multiple tier-1 providers
  • our own dedicated fibre network
  • high levels of redundancy
  • dedicated fibre connections
  • carrier grade routers
  • 24/7 on-site network engineers
  • stay connected within your 99.999% uptime SLA

Get a Quote

Hybrid Colocation

VMs connected into your physical hardware colocated in one of our data centres

As a provider of cloud services, 4D can offer fast and flexible Virtual Machines that can be connected into your physical hardware colocated in one of our data centres through a dedicated cross-connect.

This has the major advantages of: additional security (you know exactly where your cloud solution is located); speed (a dedicated cross-connect will ensure real-time speeds between your cloud platform and collocated servers); and cost savings (as you don’t have to send the data from your rack over the internet to your cloud solution) – we literally run a copper or fibre cross-connect from your rack into our cloud infrastructure.

Hybrid Colocation is

  • Flexible
  • Secure
  • Fast 
  • Cost-effective

And there’s just one supplier to call.

Get a Quote

Our flagship green data centre, 4D Surrey, is an award-winning data centre with a PUE of 1.14

4D Surrey has  the following green achievements

  • One of the greenest data centres in the UK
  • Installed one of the UK's first evaporative cooling systems
  • Award-winning green data centre project of the year
  • Cutting-edge eco-friendly cooling
  • Low actual PUE (1.14)
  • Decreased energy usage of 88.9% on current cooling load
  • Reduced carbon footprint saving c.440,605 Kg CO2 p.a.
  • Cold aisle containment
  • High intensity LED tube lighting
  • Recycling and more

About PUE

We have reduced our actual Power Usage Effectiveness (PUE) to an incredible 1.14.

PUE is calculated by dividing the total amount of power a data centre consumes by the amount used by its IT equipment. A PUE score of around 2 for a data centre is average, while 1.5 is considered efficient.

Anything below this is very difficult to achieve (which is why many data centres don't even try). Only a few other facilities are able to operate at 1.1-1.4, making 4D Surrey one of the greenest data centres in the UK.

Hear what our clients say about our Colocation services

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