Yes, that is possible. Please take a look at the following page for more information: Dedicated Server Hardware
Yes, you can install your own OS, with your own ISO file, using our KVM Console remote console. Warning: We cannot guarantee the particular OS you want will work; it is not feasible for us at Hetzner to test every OS.
When you order a server, please select the "Rescue System" as the OS. Once the server is online (you will get an email from us informing you of this), you can order a KVM Console remote console. If you already have a server, then you can order a KVM Console right away.
The following page describes how to order a KVM Console and how to use it to mount an ISO file: KVM Console
Please see our "Order processing" page.
Yes, you can order additional IP addresses. Please check the following page for information on what options there are, their prices and how to order/cancel them: IP addresses.
In general, ECC (Error Correction Code) is used to protect data by detecting and correcting data corruption, which can be caused by bit flips. Newer memory modules are becoming more prone to bit flips.
Reasons for increased risk of bit flips
Bit flips explained: One memory byte is made out of 8 bits. Each bit has a value of either 1 or 0. Bit flips refer to the event when one bit wrongfully changes its state from 1 or 0 to the opposite value.
Lower operating voltage is used
DDR memory cells are capacitors, which can store electric charge.
- Charged: 1
- Not charged: 0
The operating voltage is getting lower, which reduces the difference between 1 and 0.
More dense design
In order to use the space as efficient as possible, everything is built more densely. This reduces the space between individual memory cells which also increases the risk of bit flips.
The main difference:
- The purpose of on-die ECC (DDR5-specific) is to counterbalance the increasing risk of bit flips. On-die ECC exclusively protects data on the memory module. As soon as you move your data (e.g. to the CPU), it is no longer protected.
- The purpose of (traditional) ECC is to protect data. Hence, data is not only protected on the memory module but also when it is moved (e.g. to the CPU).
Dedicated servers at Hetzner that are labelled with ECC come with "traditional" ECC, which means that your data is protected during the entire transfer between CPU and RAM.
Dedicated servers that do not have this label either come completely without ECC or with on-die ECC (DDR5) only, which means that your data is not protected during the transfer between CPU and RAM.
Yes, we offer a backup space. For all of our dedicated servers that cost € 39.00 per month or more, the 100GB backup space is free. This free backup space comes in the form of a Storage Box, which you can order for free on your Robot account.
For all other servers, it costs € 2.90 per month.
You can find more information on backup space on the Backup space page.
Yes, it is possible to connect multiple dedicated servers together in a Gbit LAN. To connect servers, they have to be located in the same rack.
For new servers, you should mention that you would like this at the end of the ordering process in the comments section.
For existing servers that are not located in the same rack, you can request for us to move a server. Moving a server costs € 32.77 (€ 70.59 for Dell servers).
For existing and new servers, we can bring the new servers online in a new rack, and you can ask us to reserve space for moving the existing servers there.
With option 2 and 3: If you decide to move a server, it will lose all its current IPs. If it had a subnet, you will need to order a new subnet via Robot.
All servers require an additional NIC. You can see the price for it in the list for additional network equipment here:
Please send a support request to our Product Advice/Sales department via Robot. Please ask first if it is possible to move your server. (It is not possible with all server types.)
Here is another very important fact:
If you cancel a server that is already located in a your LAN, then we will assign that free rack spot to another client's server. If you want to keep that rack spot, then please get in contact with us before the cancallation date. We can then reserve that spot for you for a monthly fee of € 8.32.
All dedicated root servers have a dedicated 1Gbit uplink with unlimited traffic.
The servers can communicate with each other via their public IP addresses. Traffic is internal and is thus free.
If two servers are located in the same rack/subnet, then you'll need to add a static route to both of them so they can communicate, as we use VLANs on the switches for security. Alternatively, we can connect them together. See above: "Can multiple servers be connected together in a dedicated Gbit LAN"
That is not possible due to security reasons. Only colocation clients have access to our colocation data centers. And they only have access to their colocation racks.
You can configure your own nameserver(s) or you can use the Hetzner standard nameservers.
Unfortunately, spamming is a big problem. And we at Hetzner naturally want to prevent this. That's why we block outgoing traffic on ports 25 and 465 by default on all servers. This is a very common practice in the hosting industry because it prevents abuse. Before we unblock these ports for you as a new customer, we would like to get to know you a bit. Once you have been with us for a month and paid your first invoice, you can unblock these ports via the administration interface by yourself. In a specific use case, you can request an unblocking of ports 25 and 465 via the contact form even before the 4 weeks have expired. In your request, you can tell us details about your use case. We make decisions on a case-by-case basis. This request will only be processed on weekdays between 8 am and 6 pm.
As an alternative, you can also use port 587 to send emails via external mail delivery services. Port 587 is not blocked and can be used without sending a limit request.