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New Prefix Broker tool allows easy visualization of RIPE database history records

Interested in uncovering the history of a RIPE database object? Our recently developed and now publicly available Prefix Broker tool dubbed 'RIPE WhoWas Viewer' allows anyone to easily visualize RIPE database history records. This tool is available at

Buying, selling or leasing a block of IPv4 addresses? There are several reasons why you might be interested to take a closer look under the hood of a specific range. The most important one being: association. Who was or who were the previous owners of the addresses at hand and how might their online activities impact your organization's reputation?

Although the RIPE database history records have always been publicly available, actually uncovering the history of a block up until now has been complicated and time consuming. With the launch of our new RIPE WhoWas Viewer this is a thing of the past. But how does the tool actually work?

Technical details

Behind the scenes, we query a few of RIPE Database RESTful APIs to request the history records. This process consists of the following steps.

  1. Starting your search, we will send your query to the RIPE Database search API. This API accepts the same input as the RIPE Whois interface. It will return a list of objects that match your search query. For example, when you search for our mntner object PREFIXBROKER-MNT, the tool will fetch data from the following URL:

    The interface will now show the list of results which is default set to first search result. You will have the option to switch to one of the other search results.

  2. Next the RIPE WhoWas Viewer requests a list of versions that are currently within the RIPE database for the given object. Our mntner object PREFIXBROKER-MNT, for example, has the following versions:

    In case an object is deleted or recreated within the RIPE database, all revisions from the original object have been made inaccessible. For this reason, our tool cannot show the history for objects that have been deleted and/or recreated in the past. In some cases, a transfer will also have led to the split or recreation of a resource (deleted and created again). Also, in these cases all history of the original resource will be inaccessible.

  3. To continue the RIPE WhoWas viewer will now fetch the actual revision and parse the data for each version within the RIPE database. As an example, here you will find the first revision of our mtnr object PREFIXBROKER-MNT.

  4. After having fetched all versions, we are now able to compare all revisions. Each change within the RIPE database is now highlighted and will be visible within the RIPE WhoWas viewer web interface.

Try it out!

Curious, convinced and ready to start your own research into the history of a RIPE database object? You will find the Prefix Broker RIPE WhoWas viewer here:

Seller/buyer (EMEA)

Are you a seller in heart and soul? Do you enjoy approaching prospects, expanding your network and do you like taking on a commercial challenge? Then you’re the one we’re looking for!

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Why use Prefix Broker?

Buying IPv4 addresses can be complicated and risky. Work with a knowledgeable, experienced broker who can guide you through the process start to finish. Prefix Broker has over a decade of experience in coordinating IPv4 address transactions. We ensure that transfers proceed in a fast and secure manner.

Relax while we handle the details
  • Research the supplying party to confirm they own right-to-use.
  • Check for any other limitations on the use of the IP addresses.
  • Negotiate agreement on price, timing, governing law and currency.
  • Assist in obtaining approval for the transfer by the RIR.

Contact us to discuss an IPv4 purchase today!

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