internet_address_survey_reprobing_it28w-20090914 (09/14/2009 to 09/28/2009)

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, 22370 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地址开展PING探测。若目标IP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。每11分钟重复执行一次该探测流程，总计对22370个网络块（/24子网）执行了周期性重探测。