internet_address_survey_reprobing_it64c-20150428 (04/28/2015 to 05/12/2015)

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, 40495 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地址执行探测操作。若在11分钟的时间间隔内收到响应，则将该响应记录至本数据集。每次探测间隔为11分钟，且会周期性重复该探测流程。本次探测共计覆盖40495个网络块（/24子网），并对其进行周期性重探测。