What does this mean /16 after an IP address

Published: 13/01/2020
What does this mean /16 after an IP address
Source: UNIX.STACKEXCHANGE.COM

I came across an ip like this the other day 255.255.255.1/16 I thought the /16 referred to the number of subnetting addresses the IP could generate. However, I suspect I may be horribly wrong and felt that the Linux/Unix experts on this forum could assist.

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