internet_address_survey_reprobing_it26w-20090527 (05/27/2009 to 06/10/2009)

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, 22371 netblocks (/24 subnets) were periodically reprobed.

为采集本数据集，研究人员通过发送互联网控制报文协议（Internet Control Message Protocol，简称ICMP）回声请求（PING）数据包，对部分互联网IP地址发起PING探测。若目标设备在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。探测操作每11分钟重复执行一次。总计共有22371个网络块（/24子网）被周期性重探测。