vvo-online.de

.de country-code

Found

TLD

.de (country-code)

ICANN policies apply

no

Checks

• i

  .de is a country-code TLD (ccTLD)

  Country-code TLD: governed by its local registry under national policy, not by an ICANN contract. Registrar accreditation, dispute resolution and RDAP/WHOIS rules are set by the registry.

  #1
• ✓ TLD delegated and signed #2

  .de is delegated in the root zone and DNSSEC-signed.
• i

  Registration data not available

  No registration data via RDAP: the registry of .de offers no RDAP service. Many ccTLD registries don't offer RDAP; check the registry's WHOIS instead.

  #3

ans-01.ibh.net, ans-02.ibh.net, ans-03.ibh.net, ans-04.ibh.net, ans-05.ibh.net

Found

Parent zone

de

Delegation from

a.nic.de (194.0.0.53)

NS at the parent

ans-01.ibh.net, ans-02.ibh.net, ans-03.ibh.net, ans-04.ibh.net, ans-05.ibh.net

NS in the zone

ans-01.ibh.net, ans-02.ibh.net, ans-03.ibh.net, ans-04.ibh.net, ans-05.ibh.net

Checks

• ✓ 5 nameservers #6

  Delegated to ans-01.ibh.net, ans-02.ibh.net, ans-03.ibh.net, ans-04.ibh.net, ans-05.ibh.net.
• ✓ 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 different networks #10

  The nameservers are spread over 5 IPv4 /24s and 4 IPv6 /48s.
• ✓ 3 autonomous systems #11

  The nameservers are spread over: AS15372 (IBH-AS - IBH connect GmbH, DE): 4 addresses; AS24940 (HETZNER-AS - Hetzner Online GmbH, DE): 4 addresses; AS5539 (SPACENET - SpaceNet AG, DE): 2 addresses.
• i

  All nameserver names under .net

  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
• ✓ All reachable over IPv6 #13

  Every nameserver has an IPv6 address.

10 of 10 addresses answer authoritatively

Found

Checks

• ✓ All respond #14

  All 10 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.
• i

  Identifying string disclosed

  These nameservers answer version queries with a string that is not a version number: ans-01.ibh.net: "IBH Authorative Name Server"; ans-02.ibh.net: "IBH Authorative Name Server"; ans-03.ibh.net: "IBH Authorative Name Server"; ans-04.ibh.net: "IBH Authorative Name Server"; ans-05.ibh.net: "IBH Authorative Name Server".

  #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 2026101301 · primary root.vvo-online.de

Found

Primary (MNAME)

root.vvo-online.de

Contact (RNAME)

hostmaster.vvo-online.de

Serial

2026101301

Refresh / retry

10800 s / 1800 s

Expire

604800 s

Negative TTL

86400 s

Serial per nameserver

Checks

• ✓ Serial 2026101301 everywhere #22

  All nameservers serve the same version of the zone.
• ✓ Timers within recommendations #23

  SOA refresh 3h, retry 30m, expire 7d, negative TTL 1d.
• i

  Hidden master

  The primary nameserver root.vvo-online.de is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.

  #24
• ✓ Contact hostmaster@vvo-online.de #25

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

  The serial 2026101301 follows the YYYYMMDDnn convention (2026-10-13).