If you've got one cert with a subject alt name for each host, they'd see them al...

		A1kmm 4 months ago \| parent \| context \| favorite \| on: Ask HN: How did the internet discover my subdomain... If you've got one cert with a subject alt name for each host, they'd see them all. If you use SNI and they have different certificates, the domains might still be in Certificate Transparency logs. If a wildcard cert is used, that could help to conceal the exact subdomain.