#alleskaputt

~$ for h in ftp.de.debian.org de.archive.ubuntu.com ; do nmap -pftp -P0 $h ; done
Host discovery disabled (-Pn). All addresses will be marked 'up' and scan times will be slower.
Starting Nmap 7.91 ( https://nmap.org ) at 2021-08-31 08:06 CEST
Nmap scan report for ftp.de.debian.org (141.76.2.4)
Host is up.
rDNS record for 141.76.2.4: debian.inf.tu-dresden.de

PORT   STATE    SERVICE
21/tcp filtered ftp

Nmap done: 1 IP address (1 host up) scanned in 2.12 seconds
Host discovery disabled (-Pn). All addresses will be marked 'up' and scan times will be slower.
Starting Nmap 7.91 ( https://nmap.org ) at 2021-08-31 08:06 CEST
Nmap scan report for de.archive.ubuntu.com (141.30.62.24)
Host is up.
Other addresses for de.archive.ubuntu.com (not scanned): 141.30.62.25 141.30.62.22 141.30.62.23 141.30.62.26

PORT   STATE    SERVICE
21/tcp filtered ftp

Nmap done: 1 IP address (1 host up) scanned in 2.11 seconds
~$