computerbild.de

13 of 13 addresses answer authoritatively

Found

Checks

• ✓ All respond #14

  All 13 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: a1-130.akam.net: "41824.8"; a11-67.akam.net: "41824.4"; a14-64.akam.net: "48878.27"; a14-64.akam.net: "48878.32"; a16-65.akam.net: "48878.29"; a16-65.akam.net: "48878.31"; a6-66.akam.net: "48878.32"; a6-66.akam.net: "48878.26"; a7-67.akam.net: "41824.9". 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 2026102118 · primary ns11.netuse.de

Found

Primary (MNAME)

ns11.netuse.de

Contact (RNAME)

hostmaster.netuse.de

Serial

2026102118

Refresh / retry

3600 s / 1200 s

Expire

3600000 s

Negative TTL

3600 s

Serial per nameserver

Checks

• !

  Serials differ

  The nameservers serve different versions of the zone: 2026102118 on a1-130.akam.net (193.108.91.130), a1-130.akam.net (2600:1401:2::82), a11-67.akam.net (84.53.139.67), a11-67.akam.net (2600:1480:1::43), a14-64.akam.net (184.26.161.64), a14-64.akam.net (2600:1480:1800::40), a16-65.akam.net (23.211.132.65), a16-65.akam.net (2600:1406:1b::41), a6-66.akam.net (23.211.133.66), a6-66.akam.net (2600:1401:1::42), a7-67.akam.net (23.61.199.67), a7-67.akam.net (2600:1406:32::43); 2026102200 on ns11.netuse.de (52.137.9.10). This is normal for a few minutes after a change; if it lasts, zone transfers to the secondaries are failing.

  #22
• ✓ Timers within recommendations #23

  SOA refresh 1h, retry 20m, expire 1000h, negative TTL 1h.
• ✓ Primary is a public nameserver #24

  The primary nameserver ns11.netuse.de is one of the listed nameservers.
• ✓ Contact hostmaster@netuse.de #25

  The SOA RNAME hostmaster.netuse.de means hostmaster@netuse.de.
• ✓ Date-based serial #26

  The serial 2026102118 follows the YYYYMMDDnn convention (2026-10-21).

Signed, DS published at parent

Found

Validated by resolver

yes

Denial of existence

NSEC3

NSEC3

15 iterations, 8-byte salt

Signatures valid until

1 November 2026

DS at the parent

DNSKEY in the zone

Checks

• ✓ Signed and validated #27

  The zone is signed, the parent publishes a DS record, and the resolver validates the answers.
• ✓ DS matches a key #28

  The DS record at the parent matches a key in the zone: key tag 64276 (SHA256).
• ✓ Modern algorithms #29

  Key algorithms: RSASHA256 (8).
• ✓ Signatures valid until 2026-11-01 #30

  The earliest DNSKEY/SOA signature expires at 2026-11-01 18:04 UTC.
• !

  NSEC3 with extra iterations or salt

  NSEC3 uses 15 iterations and a 8-byte salt. RFC 9276 recommends 0 iterations and no salt: extra iterations cost resolvers CPU and add no real protection, and some validators treat high counts as insecure.

  #31