$11.)$ Both the IRC and the IBC reference numerous NFPA Standards. Note as well that while an organization such as NFPA publishes various standards they are not part of building codes until they are referenced in building codes. Attached as an essential reference in Module $1$ is a pdf of the $2018$ International Residential Code $($IRC$).[$As a sidebar comment, note that an item such as NFPA $70-17$

$($National Electrical Code$)$ has its $1$ st number as the number of the standard, here $70,$ and the $2^{nd}$ number as the date of the revision, here $17$ for the $2017$ year.$]$ From the IRC, list which NFPA Standards $($Part IX Referenced Standards$)$ refer to fire sprinklers, alarms, and$/$or $CO$ detectors.