Definitely a IP block.
http://zulu.zscaler.com/submission/show/ebe12bc418bb6d738499f43ac5a5e2e8-1446838372
http://urlquery.net/report.php?id=1446840479939
http://urlquery.net/report.php?id=1446840443412

508 loop
https://sitecheck.sucuri.net/results/taller-9.com.ar

Blacklisted domain & IP
http://multirbl.valli.org/lookup/taller-9.com.ar.html
http://multirbl.valli.org/lookup/31.170.164.105.html

No secure protocols supported
https://www.ssllabs.com/ssltest/analyze.html?d=taller-9.com.ar

No SPF record (allows spam)
http://www.dnsinspect.com/taller-9.com.ar/1446840818