'''Domain hack''' (truco con un dominio) es el nombre que reciben determinados [[nombre de dominio|nombres de dominio]] por combinar partes del [[Dominio de nivel superior geográfico|TLD]] y el [[SLD]] para componer el nombre completo del dominio.
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Algunos sitios populares con dominios de este tipo son página.de, go.to ("ir a" en inglés), [[del.icio.us]], blo.gs, rome.ro (página de John Romero), inter.net, i.am ("yo soy" en inglés), o cr.yp.to. El TLD [[.as]] de [[Samoa Americana]] se utiliza para construir el dominio de [http://notici.as notici.as] o [http://encyclopedi.as encyclopedi.as] («enciclopedias»).
Un dominio convencional respeta la estructura "ejemplo.com", donde "ejemplo" es el [[SLD]] y "com" el [[Dominio de nivel superior geográfico|TLD]]. Un '''domain hack''' podría ser "juguet.es", donde "juguet" sería el [[SLD]] y la extensión de dominio ".es" de España el [[Dominio de nivel superior geográfico|TLD]]. Un '''domain hack''' puede estar compuesto por algo más que un sólo [[nombre de dominio]], por ejemplo, haciendo uso de la estructura de ficheros del servidor que lo aloja. Varias estructuras creando subdominios permiten el empleo de nombres de dominio como "ju.guet.es", "jugue.t.es" como posibles escructuras para crear '''domain hacks'''.
En este contexto, el término "[[hack]]" representa un uso no convencional de las reglas de nombres de dominio y no una alteración a su funcionamiento.
