internet_address_survey_reprobing_it42c-20110809 (08/09/2011 to 08/23/2011)

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, 40024 netblocks (/24 subnets) were periodically reprobed.为采集本数据集，研究人员通过发送ICMP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。若探测在11分钟的时间区间内返回响应，则将该响应记录至本数据集。本次探测每11分钟重复执行一次。总计共有40024个网络块（/24子网）被周期性地重复探测。