internet_address_survey_reprobing_it45c-20120114 (01/14/2012 to 01/28/2012)

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, 40281 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分钟的时间间隔内返回，则将其记录至本数据集。该探测每11分钟重复执行一次，总计共有40281个网络块（/24子网）被周期性重复探测。