It utilizes an Intel Wireless-AC 7265. It also uses an Intel Gigabit Ethernet solution. It is exceedingly rare for a NUC to not use all-Intel networking silicon. BTW, you can look this up yourself very easily; just go to ark.intel.com and enter the name of the NUC in the search box.
This message was posted on behalf of Intel Corporation
I understand you are looking for the wired network controller model for the Intel® NUC NUC5i5RYH, let me help you on this matter.
After checking full Intel® NUC specifications at the technical product specification page, I see this is an Intel® I218-V Gigabit Ethernet Controller (10/100/1000 Mb/s)
See specifications here. Page 29
Hope it helps,