A short one, also via mastodon:

host deutschehochschule.de
deutschehochschule.de has address 162.159.134.42
deutschehochschule.de has IPv6 address ::ffff:162.159.134.42
deutschehochschule.de mail is handled by 0 deutschehochschule-de.mail.protection.outlook.com.

“Of course we have IPv6”. BTW: The IPv4 address is from Cloudflare. AFAIK: You have to actively do something not to do proper IPv6 using Cloudflare.