Requesting additional IPv4 addresses for Cloud Servers

  • Last updated on: 2016-01-13
  • Authored by: Rackspace Support

Rackspace offers the ability to add IPv4 addresses to cloud servers for a fee. If you want to obtain an additional IPv4 address for your server, you must open a ticket through the Support section of the Cloud Control Panel to get policy information and approval. Before opening a ticket, read this article for necessary information and alternatives.


Because of the global shortage of IPv4 address space, Rackspace currently offers additional IPv4 addresses only for the following purposes:

  • SSL on cloud servers
  • NAT (Network Address Translation) on a Brocade Vyatta vRouter

Note: No more than five additional IPv4 addresses can be allocated to a single cloud server or Brocade Vyatta vRouter. Thus each cloud server or Brocade Vyatta vRouter has a maximum capacity of six IPv4 addresses, including the originally assigned public IPv4 address.


The rates for additional IPv4 addresses vary by region. Discuss rates for your region with the Support team during your setup.

Information needed for additional IPv4 addresses

After you are approved for an additional IPv4 address, you will be asked to provide the following information.

Cloud servers

For an additional IPv4 address on a cloud server, you must provide the following information:

  • The name of the server for which you want to add the IP address.
  • The SSL certificate. The certificate must have been signed by a valid Certificate Authority; self-signed certificates are not accepted.

Brocade Vyatta vRouters

For an additional IPv4 address on a Brocade Vyatta vRouter, you must confirm that you intend to use the additional IPv4 address for the purpose of NAT.

Alternatives to obtaining additional IPv4 addresses

Because there is a finite number of IPv4 addresses, Rackspace limits the number that it distributes. We recommend that you use one of the following options instead of obtaining additional IPv4 addresses:

  • Subject Alternate Name (SAN) certificates - SAN certificates make it possible to protect multiple domain names with one certificate. When you use a SAN certificate for a domain, you can then add more SAN values and have that same certificate protect that single domain.

  • Server Name Indication (SNI) - SNI enables the server to choose the appropriate certificate early during the communication between the client and the web server.

    SNI does not work properly and can produce SSL errors when used with any version of Internet Explorer on Windows XP, and when used with Internet Explorer version 7 or later on any operating system. Generally, any operating system released after 2011 can be used with SNI. The browsers known to work with SNI are Firefox, Chrome, and Safari.

    Although support for SNI is not complete, it remains a good alternative to adding IPv4 addresses.

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