Language509
Internet security certificate
File type: Internet related file
Files with 509 extension are associated with internet security of your server, web sites etc.
What is 509 file?
File type category:
Internet related file
Date updated: June 27, 2025
The 509 file extension is used to secure your server, web site transactions, logins, webmail and connections with an SSL Certificate. Choose GlobalSign SSL Certificates for the highest levels of strong security, confidence and trust in your web site, corporate assets and online brand.
Mime: application/x-x509-ca-cert
Associated software actions with the 509 file
Software applications that handle other tasks involving 509 files:
Opera browser (Microsoft Windows)
Firefox (Microsoft Windows)