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Use "routable" in a sentence
"Running my own mail server requires me to have a routable IP address."
"Even before their communications blackout, Egypt really was a small part of the Internet in absolute terms, just a few thousand routable networks out of nearly 400,000 making up the global IPv4 address space."
"For example, Chinanet, among the nation's largest ISPs, has about 92 million routable Internet addresses, and roughly 950,000 -- or about 1 percent of those addresses -- appear to be sickened with Conficker."