internet_address_survey_reprobing_it45w-20120215 (02/15/2012 to 02/29/2012)

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, 40280 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（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Ping探测。若目标地址在11分钟的时间间隔内返回响应，则将该响应记录入本数据集。每次探测的间隔为11分钟，总计对40280个网络块（/24子网）开展了周期性重复探测。