2015-10-06 ARIN、北米地域のIPv4アドレス在庫枯渇を発表 -INTERNET Watch http://internet.watch.impress.co.jp/docs/news/20150929_723181.html https://www.arin.net/announcements/2015/20150924.html http://teamarin.net/2015/09/24/arin-reaches-ipv4-depletion/ https://www.nic.ad.jp/ja/topics/2015/20150925-01.html