internet_address_survey_reprobing_it53j-20130326 (03/26/2013 to 04/09/2013)

To collect this data, a subset of Internet IP addresses was pinged by sending ICMP ECHO_REQUEST (PING) packet. The response (if it ever came within 11 minutes time interval) was recorded in this data set. Probe was repeated every 11 minutes. In all, 40271 netblocks (/24 subnets) were periodically reprobed.为构建该数据集，研究人员通过发送ICMP回声请求（ICMP ECHO_REQUEST，即PING）数据包，对部分互联网IP地址执行ping探测。若目标地址在11分钟的时间间隔内返回响应，则将该响应记录至本数据集。探测操作每11分钟重复一次，总计对40271个网络块（/24子网）进行了周期性重探测。