ys_id values uniquely identify each record in your Service-now instance database. While you should never try to modify these values, it is sometimes useful to know what the sys_id value is for a particular record. This article describes the different ways of identifying the sys_id value for a particular record.
View the sys_id in your browser information bar
Since the sys_id of a record is always part of the URL linking to that record, you can see the sys_id in the information bar of your browser simply by hovering over a link to the record.
So, if the URL for an incident record looked like this…
The sys_id of that record would be this…
Copy URL menu option
The best way to actually retrieve the the sys_id for a record is just to open that record, right-click the header for the record, and select the ‘Copy URL’ menu option. This action can also be taken by right-clicking any record in a list. The sys_id value is the 32-character value immediately after ‘sys_id=’.
Why is the sys_id -1?
A sys_id value of -1 in a URL is not actually a sys_id at all. If you see -1 as the sys_id in a URL, it indicates that a new record form will be displayed from that URL.
More information can be found about sys_id values here.