If you have ever needed to know what a netmask looks like expressed in some other format this table of equivalents should help. It contains common IPv4 netmasks expressed in four different formats.
netmask.png

From:

https://www.ws.afnog.org/afnog2010/unix-intro/references/netmask-table.html

and https://www.pawprint.net/designresources/netmask-converter.php