[e2e]where can i find an ip or host address list?

[liww]

hi,
Now I'm doing an experiment which needs to probe 100000 more or less hosts in the Internet via ICMP and TCP with slight loads. The goal of this experiment is to find the difference between ICMP and TCP when they are used to probe host connectivity.May be I can randomly generate the amount of IP address I needed. But considering there are a great deal of unused IP addresses in the IPv4 address space,the random approach may be less efficient.One better way is to find a list with addresses or hosts name real in use.
Does any one have such an IP address or hosts list? or can direct me where can i get such a list?
Thanks!

liww
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