We check this website, now vivanuncios.com.mx is up and dont blocked for our system and other users of the Internet.
So, answer to question: Is vivanuncios Down Right Now? - NO! vivanuncios is up!
If you have problem with access to site vivanuncios, and domain vivanuncios.com.mx is not avalible.
Clear browser cache and/or try other web browser
(Chrome, Firefox or Safari).