ns1.steffann.nl [185.54.92.21] [2a00:8642:1000:1::21]
dwcon.org go6.si go6lab.si idwcon.org ipv6-lab.net nat64check.org nety.net nistco.eu nog.community nogalliance.org onderwijs.net simplyunderstand.com sintact.nl steffann.nl vames.nl