All name servers are in the same network.

NS_SAME_NETWORK · Severity: Warning

• WarningNS_SAME_NETWORK

  All name servers are in the same network.

  Every IPv4 address is in one /24 and every IPv6 address in one /48, so one network outage or routing problem takes every name server down at once (RFC 2182 section 3.1). The check uses the addresses only, not the operator or the ASN.

  Recommendation: Add a name server in another network or with another provider.

Reported by

• Name server check

Available through the API

• Name server check API

Related findings

• Warning NS_SINGLE The zone has only one name server.
• Info NS_SINGLE_TLD All name servers are under the same top-level domain.
• Info NS_IN_BAILIWICK A name server lies inside the zone it serves and needs glue records.
• Warning NS_NOT_FOUND The name has no NS records.
• Warning NS_UNRESOLVABLE A name server's name has no IPv4 or IPv6 address.

All findings