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For example, in the late 1990s, the IP address {{IPaddr|208.130.29.33}} (since reassigned) was used by www.freesoft.org. An analysis of this address identified three CIDR prefixes. {{IPaddr|208.128.0.0|11}}, a large CIDR block containing over 2 million addresses, had been assigned by [[ARIN]] (the North American RIR) to [[MCI Communications|MCI]]. Automation Research Systems (ARS), a Virginia [[Value-added reseller|VAR]], leased an Internet connection from MCI and was assigned the {{IPaddr|208.130.28.0|22}} block, capable of addressing just over 1000 devices. ARS used a {{IPaddr||24}} block for its publicly accessible servers, of which {{IPaddr|208.130.29.33}} was one. All of these CIDR prefixes would be used, at different locations in the network. Outside MCI's network, the {{IPaddr|208.128.0.0|11}} prefix would be used to direct to MCI traffic bound not only for {{IPaddr|208.130.29.33}}, but also for any of the roughly two million IP addresses with the same initial 11 bits. Within MCI's network, {{IPaddr|208.130.28.0|22}} would become visible, directing traffic to the leased line serving ARS. Only within the ARS corporate network would the {{IPaddr|208.130.29.0|24}} prefix have been used.
===IPv4 CIDR blocks===see
{| class="wikitable"
! rowspan = 2 | Address<br />format
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