internet_address_survey_reprobing_it74c-20170310 (03/10/2017 to 03/24/2017)

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, 40493 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。若探测响应在11分钟的时间窗口内返回，则将该响应记录至本数据集。每11分钟重复执行一次探测操作。总计共有40493个网络块（netblocks，/24子网）被周期性重复探测。