The success of the internet has given rise to a new type of software that doesn't require any download or install on the user's machine. All you need is a web browser to use the software.
This gave rise to a new type of service called Infrastructure As A Service (shortly known as iaas), which offers setting up servers on-demand.
This .biz TLD is an exact match for iaas, easy to remember and great domain name for use in the cloud niche.
Great news! Domain iaas.biz has been registered in the past and previous domain owner(s) may have forgot to renew or dropped it.