Table,,,1.15,,,Default,,,Subnet,,,Masks,,,(Network,,,Prefix,,,Notation),,,Address,,,Class,,,Bits,,,for,,,Subnet,,,Mask,,,Network,,,Prefix,,,Class,,,A,,,11111111,,,00000000,,,00000000,,,00000000,,,/8,,,Class,,,B,,,11111111,,,11111111,,,00000000,,,00000000,,,/16,,,Class,,,C,,,11111111,,,11111111,,,11111111,,,00000000,,,/24,,,For,,,example,,,,the,,,class,,,B,,,network,,,ID,,,138.96.0.0,,,with,,,the,,,subnet,,,mask,,,of,,,255.255.0.0,,,would,,,be,,,expressed,,,in,,,network,,,prefix,,,notation,,,as,,,138.96.0.0/16.,,,Either,,,a,,,default,,,subnet,,,mask,,,,which,,,is,,,used,,,when,,,using,,,class-based,,,network,,,IDs,,,,or,,,a,,,custom,,,subnet,,,mask,,,,which,,,is,,,used,,,when,,,subnetting,,,or,,,supernetting,,,,is,,,configured,,,on,,,each,,,TCP/IP,,,node.,,,Consider,,,,the,,,,example,,,,in,,,,Figure,,,,1.7.,,,,Manage,,Your,,Profile,,,,Site,,Feedback,,Site,,Feedback,,x,,Tell,,us,,about,,your,,experience.,,This,,,operation,,,is,,,known,,,as,,,a,,,bit-wise,,,logical,,,AND.,,,

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The,,,subnet,,,mask,,,uses,,,a,,,total,,,of,,,24,,,bits,,,to,,,define,,,the,,,subnetted,,,network,,,ID.,,,Figure,,1.7,,Network,,139.12.0.0,,Before,,Subnetting,,Network,,139.12.0.0,,is,,subnetted,,by,,utilizing,,the,,first,,8,,host,,bits,,(the,,third,,octet),,for,,the,,new,,subnetted,,network,,ID.,,Even,,,,a,,,,class,,,,B,,,,network,,,,with,,,,65,,,,thousand,,,,hosts,,,,is,,,,impractical.,,,,Note,,,that,,,the,,,rest,,,of,,,the,,,IP,,,internetwork,,,still,,,regards,,,all,,,the,,,nodes,,,on,,,the,,,three,,,subnets,,,as,,,being,,,on,,,network,,,139.12.0.0.,,,Latest,,,,from,,,,TechRepublic,,,,Verizon's,,,,new,,,,app,,,,launcher,,,,brings,,,,spyware,,,,to,,,,all,,,,its,,,,Android,,,,phones,,,,,says,,,,EFF,,,,Verizon's,,,,impending,,,,release,,,,of,,,,a,,,,new,,,,app,,,,launcher,,,,for,,,,Android,,,,called,,,,AppFlash,,,,has,,,,some,,,,privacy,,,,experts,,,,worried,,,,,as,,,,the,,,,launcher,,,,collects,,,,a,,,,lot,,,,of,,,,personal,,,,information,,,,for,,,,advertising.,,,,Register,,today,,,its,,free!,,TechRepublic,,Video,,Watch,,TechRepublic's,,videos,,of,,the,,hottest,,IT,,events,,and,,products,,,interviews,,with,,tech,,experts,,and,,innovators,,,and,,how-to,,tutorials,,here.,,A,,,new,,,value,,,is,,,needed,,,to,,,define,,,which,,,part,,,of,,,the,,,IP,,,address,,,is,,,the,,,network,,,ID,,,and,,,which,,,part,,,is,,,the,,,host,,,ID,,,regardless,,,of,,,whether,,,class-based,,,or,,,subnetted,,,network,,,IDs,,,are,,,being,,,used.,,,

However,,,,,consider,,,,the,,,,class,,,,A,,,,network,,,,ID,,,,,which,,,,has,,,,the,,,,possibility,,,,of,,,,over,,,,16,,,,million,,,,hosts,,,,on,,,,the,,,,same,,,,network.,,,,Conner,,,Forrest,,,,,,March,,,31,,,,2017,,,,7:58,,,AM,,,PST,,,Google,,,launches,,,free,,,Optimize,,,A/B,,,testing,,,tool,,,for,,,SMBs,,,Google's,,,new,,,tool,,,runs,,,on,,,top,,,of,,,Google,,,Analytics,,,to,,,allow,,,small,,,businesses,,,to,,,test,,,and,,,experiment,,,with,,,multiple,,,versions,,,of,,,their,,,company,,,website.,,,Figure,,,1.8,,,Network,,,139.12.0.0,,,After,,,Subnetting,,,A,,,key,,,element,,,of,,,subnetting,,,is,,,still,,,missing.,,,Top,,,,Of,,,,Page,,,,Show:,,,,Inherited,,,,Protected,,,,Print,,,,Export,,,,(0),,,,Print,,,,Share,,,,IN,,,,THIS,,,,ARTICLE,,,,.,,,,This,,,,creates,,,,subnets,,,,,,,,,subdivisions,,,,of,,,,an,,,,IP,,,,network,,,,each,,,,with,,,,their,,,,own,,,,unique,,,,subnetted,,,,network,,,,ID.,,,,Register,,,,today,,,,,its,,,,free!,,,,Resource,,,,Library,,,,Browse,,,,our,,,,huge,,,,collection,,,,of,,,,tech,,,,white,,,,papers,,,,,case,,,,studies,,,,,downloads,,,,,and,,,,other,,,,resources,,,,here.,,,,,,2017,,Microsoft,,.,,

Services,,,About,,,Us,,,Membership,,,Newsletters,,,RSS,,,Feeds,,,Site,,,Map,,,Site,,,Help,,,&,,,Feedback,,,FAQ,,,Advertise,,,Reprint,,,Policy,,,Explore,,,Blogs,,,Downloads,,,TechRepublic,,,Forums,,,Meet,,,the,,,Team,,,Tech,,,Pro,,,Research,,,Resource,,,Library,,,Photos,,,Videos,,,,,,2017,,,CBS,,,Interactive.,,,The,,,subnetted,,,network,,,ID,,,and,,,its,,,corresponding,,,subnet,,,mask,,,is,,,then,,,expressed,,,in,,,network,,,prefix,,,notation,,,as:,,,138.96.58.0/24,,,Network,,,prefix,,,notation,,,is,,,also,,,known,,,as,,,Classless,,,Interdomain,,,Routing,,,(CIDR),,,notation.,,,Note,,Because,,all,,hosts,,on,,the,,same,,network,,must,,use,,the,,same,,network,,ID,,,all,,hosts,,on,,the,,same,,network,,must,,use,,the,,same,,network,,ID,,as,,defined,,by,,the,,same,,subnet,,mask.,,This,,,documentation,,,is,,,archived,,,and,,,is,,,not,,,being,,,maintained.,,,All,,,,rights,,,,reserved.,,,,TechRepublic,,,,Forums,,,,Visit,,,,our,,,,forums,,,,to,,,,engage,,,,with,,,,your,,,,IT,,,,peers,,,,on,,,,the,,,,issues,,,,of,,,,the,,,,day,,,,here.,,,,The,,,,subnet,,,,mask,,,,uses,,,,a,,,,total,,,,of,,,,24,,,,bits,,,,(255.255.255.0),,,,to,,,,define,,,,the,,,,subnetted,,,,network,,,,ID.,,,,The,,,,subnetted,,,,network,,,,ID,,,,and,,,,its,,,,corresponding,,,,subnet,,,,mask,,,,is,,,,then,,,,expressed,,,,in,,,,dotted,,,,decimal,,,,notation,,,,as:,,,,138.96.58.0,,,,,255.255.255.0,,,,Top,,,,Of,,,,Page,,,,Network,,,,Prefix,,,,Length,,,,Representation,,,,of,,,,Subnet,,,,Masks,,,,Because,,,,the,,,,network,,,,ID,,,,bits,,,,must,,,,always,,,,be,,,,chosen,,,,in,,,,a,,,,contiguous,,,,fashion,,,,from,,,,the,,,,high,,,,order,,,,bits,,,,,a,,,,shorthand,,,,way,,,,of,,,,expressing,,,,a,,,,subnet,,,,mask,,,,is,,,,to,,,,denote,,,,the,,,,number,,,,of,,,,bits,,,,that,,,,define,,,,the,,,,network,,,,ID,,,,as,,,,a,,,,network,,,,prefix,,,,using,,,,the,,,,network,,,,prefix,,,,notation:,,,,/,,,,.,,,,

Clearly,,,,these,,,network,,,IDs,,,do,,,not,,,represent,,,the,,,same,,,range,,,of,,,IP,,,addresses.,,,RFC,,,950,,,defines,,,the,,,use,,,of,,,a,,,subnet,,,mask,,,(also,,,referred,,,to,,,as,,,an,,,address,,,mask),,,as,,,a,,,32-bit,,,value,,,that,,,is,,,used,,,to,,,distinguish,,,the,,,network,,,ID,,,from,,,the,,,host,,,ID,,,in,,,an,,,arbitrary,,,IP,,,address.,,,..,,,A,,subnet,,mask,,is,,used,,to,,tell,,an,,IP,,node,,how,,to,,extract,,a,,class-based,,or,,subnetted,,network,,ID.,,Then,,,,perform,,,,the,,,,AND,,,,operation,,,,on,,,,each,,,,bit,,,,and,,,,write,,,,down,,,,the,,,,result.,,,,The,,,subnetting,,,of,,,network,,,139.12.0.0,,,should,,,be,,,done,,,in,,,such,,,a,,,way,,,so,,,that,,,it,,,does,,,not,,,impact,,,nor,,,require,,,the,,,reconfiguration,,,of,,,the,,,rest,,,of,,,the,,,IP,,,internetwork.,,,

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