internet_address_survey_reprobing_it43w-20110913 (09/13/2011 to 09/27/2011)

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, 40283 netblocks (/24 subnets) were periodically reprobed.

为构建本数据集，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地址开展PING探测。若目标IP地址在11分钟的时间窗口内返回响应，则将该响应记录至本数据集。探测操作每隔11分钟重复执行一次。本次数据采集累计对40283个网络块（/24子网）完成了周期性重探测。