Domain Blocked

Hello. I teach web design classes at Milwaukee Area Technical College. I
have referred students to the HTML Validation Markup Service at
https://validator.w3.org/ for many years to help them get into good habits.
Last year, I noticed that we could no longer validate by pasting the URL as
it looks like our domain name creatematc.com is now blocked. Is there any
way to unblock it so that students can continue to learn and get into good
habits?

Thanks,

Jonathan
____________________________________________________________
Jonathan Meersman, Instructor
Web & Digital Media Design
<http://www.matc.edu/media_creative_arts/degrees/interactive-media.cfm>
and Front-End
Web Developer
<http://www.matc.edu/media_creative_arts/diplomas/web-designer.cfm> Programs
Creative Arts, Design & Media Pathway
Milwaukee Area Technical College
Phone: 414.297.6289
meersmaj@matc.edu