bad-hersfeld.de

cns-nbg1-mhef.nethinks.com, cp-nbg1-mhef.nethinks.com

Found

Parent zone

de

Delegation from

a.nic.de (194.0.0.53)

NS at the parent

cns-nbg1-mhef.nethinks.com, cp-nbg1-mhef.nethinks.com

NS in the zone

cns-nbg1-mhef.nethinks.com, cp-nbg1-mhef.nethinks.com

Checks

• i

  2 nameservers

  Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: cns-nbg1-mhef.nethinks.com, cp-nbg1-mhef.nethinks.com.

  #6
• ✓ Parent and zone agree #7

  The parent delegation and the zone's NS records list the same nameservers.
• ✓ No glue needed #8

  All nameservers are outside the zone, so no glue records are needed.
• ✓ All names resolve #9

  Every nameserver name has an address and is not an alias.
• !

  Nameservers in one network

  all IPv4 addresses are in 212.218.193.0/24. A single network failure takes all nameservers down; RFC 2182 recommends topologically separate networks (anycast setups are an exception).

  #10
• i

  All nameservers in one AS

  All nameserver addresses are announced by one network operator (AS8319 (NETHINKS-AS - NETHINKS GmbH, DE): 2 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.

  #11
• i

  All nameserver names under .com

  All nameserver names are under one TLD, so a problem with that TLD also makes the nameservers unreachable. Some operators use names under two TLDs for extra resilience.

  #12
• !

  No IPv6

  None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.

  #13

2 of 2 addresses answer authoritatively

Found

Checks

• ✓ All respond #14

  All 2 nameserver addresses answered.
• ✓ All authoritative #15

  Every responding nameserver answers authoritatively for the zone.
• ✓ No recursion #16

  The nameservers do not answer recursive queries for other domains.
• !

  Software version disclosed

  These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: cns-nbg1-mhef.nethinks.com: "9.11.4-P2-RedHat-9.11.4-26.P2.el7_9.16.tuxcare.els19"; cp-nbg1-mhef.nethinks.com: "9.11.4-P2-RedHat-9.11.4-26.P2.el7_9.16.tuxcare.els19". Hide or replace the version string.

  #17
• ✓ Zone transfers refused #18

  No nameserver allows a zone transfer to the public.
• ✓ TCP supported #19

  All nameservers answer over TCP.
• ✓ EDNS supported #20

  All nameservers support EDNS(0).
• ✓ Public addresses #21

  All nameserver addresses are publicly routable.

serial 2026101900 · primary cp-nbg1-mhef.nethinks.com

Found

Primary (MNAME)

cp-nbg1-mhef.nethinks.com

Contact (RNAME)

support.nethinks.com

Serial

2026101900

Refresh / retry

3600 s / 3600 s

Expire

86400 s

Negative TTL

3600 s

Serial per nameserver

Checks

• ✓ Serial 2026101900 everywhere #22

  All nameservers serve the same version of the zone.
• !

  Unusual SOA timers

  retry 1h should be shorter than refresh 1h; expire 1d is shorter than 7d; secondaries stop answering too soon when the primary is down. Current values: refresh 1h, retry 1h, expire 1d, negative TTL 1h.

  #23
• ✓ Primary is a public nameserver #24

  The primary nameserver cp-nbg1-mhef.nethinks.com is one of the listed nameservers.
• ✓ Contact support@nethinks.com #25

  The SOA RNAME support.nethinks.com means support@nethinks.com.
• ✓ Date-based serial #26

  The serial 2026101900 follows the YYYYMMDDnn convention (2026-10-19).

Not signed

Found

Validated by resolver

no

Checks

• !

  Not signed

  The zone is not signed with DNSSEC, so answers can be spoofed. Enable DNSSEC at your DNS provider and publish the DS record at your registrar.

  #27