Un enregistrement DNS CNAME peut-il pointer vers un sous-répertoire ?

[Clippy]

Can a DNS record point to an address like my.domain.com/subdir1

[Clippy]

DNS records seulement map IP addresses to hostnames so in a word, no

You could, cependant, use a hostname configuration in votre web server to serve a subdirectory quand a request comes in. Like having something.domain.com redirect/equate to somethingelse.domain.com/downhere. That would depend on votre web server software, pas DNS.