www.sid.ir                     has IPv4  has IPv6  2a00:c98:2050:a036:fc4e:b8e4:a622:a26c (failed) (errno=64) (time=15.750264)
www.singtel.com                has IPv4  has IPv6  2400:6500:ff00::34dc:9035 (failed) (errno=60) (time=75.005397), 2400:6500:ff00::344c:2306 (failed) (errno=60) (time=75.032386)
www.unionbankofindia.co.in     has IPv4  has IPv6  2400:5300:1::105 (failed) (errno=61) (time=0.245926)