how does the isp provide public ip from where did they get the public ip registerd
closed as not a real question by Zoredache, SvW, EEAA, DanBig, Scott Pack Mar 16 '11 at 20:33
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The same way you do it internally, but with public IPs and BGP to other providers... Oh and some really big routers. Except that they have to register their IPs with IANA local registries or another provider known as a LIR(local internet registry.).