internet_address_survey_reprobing_it40w-20110406 (04/06/2011 to 04/20/2011)

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, 22374 netblocks (/24 subnets) were periodically reprobed.为采集本数据集，研究人员通过发送网际控制报文协议回显请求（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IP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。探测任务每11分钟重复执行一次，最终共对22374个网络块（netblocks，即/24子网）开展周期性重探测。