When you purchase a dedicated hosting plan you rent an entire server from a hosting company. The hosting company retains ownership of the server and ensures that it is operational at all times.
Colocation hosting, sometimes abbreviated to colo hosting, is a little different. With colation hosting plans you need to provide the server itself. The hosting company will host your servers for you and maintain them, but you retain full ownership of the hardware.
Many companies find colocation hosting a practical solution when they need more scalability and security that can be provided in-house.
AltusHost offer colocation to European companies. They have colocation hosting services in Amsterdam,
Their data centre is protected twenty-four hours a day using electronic and physical security measures. They also provide an option to install a webcam so that you can inspect your rack and be assured it is safe.
You need to contact AltusHost in order to get a quote.
Based in Secaucus, New Jersey, USA, InterServer offer colocation services from $125 for a dedicated server and $25 for each additional server. Whole racks and cabinets can also be hosted.
Situated in Tempe, Arizona, USA, Omnis have a large state of the art data centre with 24/7 support and monitoring.
Their colocation prices start from only $35.
ZNetLive are an Indian hosting company that offers a wide variety of hosting solutions. They offer colocation hosting at their Delhi and Mumbai data centres.
Their data centres are tier four and are privately owned. You need to contact them directly for a quote.