Rangarira ndima iri pasi apa uye ipapo pindura mubvunzo gare gare mumutauro mumwe chetewo sechikamu:  Kupfuura: Kurongeka kwezvikamu kunodzika kubva kurudyi kuenda kuruboshwe; zita rimwe nerimwe kuruboshwe rinotsanangura chikamu chiduku, kana kuti subdomain yenzvimbo iri kurudyi. Somuenzaniso, zita romuenzaniso rinotsanangura nzvimbo yechirongwa che com, uye www inzvimbo yechirongwa che example.com. Uyu muti wezvikamu zviduku unogona kuva nematanho anosvika ku127. Chiratidzo chinogona kuva nezero kusvika kune mavara 63. Chiratidzo chisina chinhu, cheurefu husina chinhu, chakachengeterwa nzvimbo yemudzi. Zita rezita rakazara harigone kudarika kureba kwemavara mazana maviri nemakumi mashanu nematatu mukumiririrwa kwaro kwemashoko. Mukati binary kumiririrwa DNS kunonyanyisa urefu kunoda 255 octets okuchengetera, sezvo uyewo inochengeta urefu zita. Kunyange zvazvo pasina hwokugadzira muganhu aripo kushandisa chero hunhu ari Domain zita Labels izvo anomiririrwa ane octet, hondo mazita vanoshandisa vaifarira pamanyorerwo uye hunhu yakatarwa. Zviratidzo zvinobvumidzwa mumazita chikamu cheASCII, chinoumbwa nezviratidzo kubva pa a kusvika pa z, A kusvika pa Z, manhamba kubva pa 0 kusvika pa 9, uye hyphen. Uyu mutemo unozivikanwa seLDH mutemo (mavara, manhamba, hyphen). Mazita enzvimbo anotsanangurwa nenzira yakazvimirira. Zviratidzo hazvifaniri kutanga kana kupera ne hyphen. Mutemo wakawedzerwa unoda kuti mazita epamusoro-soro haafaniri kuva ose-anoverengeka. Chikwata chakaganhurirwa chevara ASCII chinobvumirwa muDNS chakatadzisa kumiririrwa kwemazita nemashoko emitauro mizhinji mumabhii avo omuzvarirwo kana manyoro. Kuti izvi zviitike, ICANN yakabvumidza Internationalizing Domain Names in Applications (IDNA) system, iyo mashandisirwo evashandisi, senge mabhurawuza ewebhu, mepu Unicode tambo mune inoshanda DNS hunhu seti uchishandisa Punycode. Muna 2009 ICANN yakabvumidza kuiswa kwepasi rose zita rezita renyika kodhi yepamusoro-soro domains (ccTLDs). Mukuwedzera, mazita mazhinji ezvinyorwa zvemazita epamusoro epamusoro (TLDs) akagamuchira IDNA system, inotungamirirwa neRFC 5890, RFC 5891, RFC 5892, RFC 5893.  Mubvunzo: Ndeipi yakakura yezvikamu zviduku zvemiti?
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