Test of www.jon.cz
F
Detailed results
DNS servers
The domain has at least some of its DNS servers accessible over IPv6. That is grade B.
www.jon.cz
- ✗ beta.ns.active24.cz [2a00:4b40:1000:590:185:111:90:94] (does not resolve the domain)
- ✓ gama.ns.active24.sk [2a00:1968::1002:185:71:158:30]
- ✓ alfa.ns.active24.cz [2a02:4a8:ac24:100::96:2]
Web servers
Website without IPv6. That is grade E/F.
E-mail servers
E-mail servers without IPv6. That is grade E/F.
- ✗ mx.jon.cz [no IPv6]
Last tests
| Test date | Grade |
|---|---|
| 25 Sep 2025 14:29 | F |