internet_address_survey_reprobing_it31w-20100208 (02/08/2010 to 02/22/2010)

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, 22376 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消息协议（Internet Control Message Protocol，ICMP）回显请求（ECHO_REQUEST，即PING）数据包，对部分互联网IP地址执行探测。若响应在11分钟的时间间隔内抵达，则将其记录至本数据集。探测操作每11分钟重复执行一次，总计共有22376个网络块（/24子网）被周期性地重复探测。