Co m o ne d whatismyipaddressco m o r ipchickenco m

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: io ns because services like e-mail and Facebo o k identif y yo u by yo ur username and passwo rd. The IP address simply tells the co mputers that yo u’re co mmunicating with where they can f ind yo u right no w. IP addresses can also be used to identif y a user’s physical lo catio n, to tailo r search results, and to custo mize advertising. See Chapter 14 "Go o gle in Three P arts: Search, Online Advertising, and Beyo nd" to learn mo re. The o riginal and still widely used f o rmat f o r IP addresses is kno wn as IP v4. Under IP v4, IP addresses are expressed as a string o f f o ur numbers between 0 and 255, separated by three perio ds. Want to kno w which IP address yo ur smartpho ne o r co mputer is using? Visit a Web site like ip-adress.co m (o ne “d”), whatismyipaddress.co m, o r ipchicken.co m. The Internet Is Full—We’ve Run Out of IP Addresses If yo u do the math, f o ur co mbinatio ns o f 0 to 255 gives yo u a little o ver f o ur billio n po ssible IP addresses. Fo ur billio n so unds like a lo t, but the number o f devices co nnecting to the Internet is explo ding! Internet access is no w baked into smartpho nes, tablets, televisio ns, DVD players, video game co nso les, utility meters, thermo stats, appliances, picture f rames, and mo re. Ano ther pro blem is a big chunk o f existing addresses weren’t allo cated ef f iciently, and these can’t be easily reclaimed f ro m the co rpo ratio ns, universities, and o ther o rganizatio ns that initially received them. All o f this means that we’ve run o ut o f IP addresses. In February 2011 the last batches were made available to regio nal Internet registries.J. Biggs, “Everybo dy P anic: Why We’re Running Out o f IP Addresses and What’s Go ing to Happen No w,” CrunchGear, February 2, 2011. There are so me schemes to help delay the impact o f this IP address dro ught. Fo r example, a technique kno wn as NAT (net work address t ranslat ion) uses a gateway that allo ws multiple devices to share a single IP address. But NAT slo ws do wn Internet access and is co mple...
View Full Document

Ask a homework question - tutors are online