http://www.moj.go.jp/isa/
http://www.moj.go.jp/isa/publications/materials/i-ens_index.html

出入国在留管理庁電子届出システムは，出入国管理及び難民認定法（以下「入管法」といいます。）第１９条の１６に定める中長期在留者が行う「所属
機関等に関する届出」及び入管法第１９条の１７に定める中長期在留者を受け入れている所属機関の職員が行う「所属機関による届出」を，インターネ
ットを利用して行うシステムです。

https://www.isa.go.jp/en/publications/materials/i-ens_index.html

"The Immigration Services Agency's e-Notification System is an internet-based system that mid to long-term residents can use 
to submit "notifications of change in activity, contract, or marital status" as stipulated in Article 19-16 of the 
Immigration Control and Refugee Recognition Act (hereinafter referred to as the "Immigration Control Act"), and that 
affiliated organizations that accept these mid to long-term residents can use to implement "notifications made by affiliated 
organizations" as stipulated in Article 19-17 of the same Act."

http://www.moj.go.jp/content/001244280.pdf
国籍・地域別高度外国人材の在留者数の推移

在留者	2645