What it reads
Your name servers and the networks they sit on. Fewer than two warns. So does having them all on one network, unless it is a large managed DNS service we recognise, such as Cloudflare or Amazon Route 53.
Check 39 of 54 · Domain and registration
Name server backup, explained.
Your DNS does not all sit in one place whose outage would take your domain dark.
Engine 1.57.0, read 25 October 2026
Free checkScoredReliability: Definitive
Could you lose the domain, or part of it?
What the check does, and where it stops.
Why it matters
If every name server is on one network and that network fails, your website and email vanish together.
What a failure looks like
A failure is a finding in your result. The check is scored, so it can lower your score, and the Full Report gives every finding its severity and a fix. If the check cannot finish, it is recorded as unknown: it carries no penalty, and it is never a pass.
Where its limits are
Reports unknown when too few name servers can be placed.
ReliabilityDefinitive: reads a published value
Check 39 is one of 10 in Domain and registration. See it in its row on the scanner page, beside the rest of Domain and registration.
See how your domain does.
The free check includes this one and takes about 30 seconds. No account. Nothing to install.