10.23721/109/1353648University of Southern California-Information Sciences Institute, internet_address_census_it34c-20100707 (07/07/2010 to 08/09/2010)IMPACT2012en1353648132ping census of allocated IPv4 addressesTo collect this data, an Internet-wide IP address sweep was conducted. Every IP address in the ranges allocated by IANA was pinged once by sending ICMP ECHO_REQUEST (PING) packet. If the response (ICMP_ECHO_REPLY) came, its IP address was recorded in this data-set. In all, over 2.5 billion distinct IP addresses were probed during this experiment.