uni-hannover.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

ns1.uni-hannover.de, ns2.uni-hannover.de, ns3.uni-hannover.de

Found

Parent zone

de

Delegation from

a.nic.de (194.0.0.53)

NS at the parent

ns1.uni-hannover.de, ns2.uni-hannover.de, ns3.uni-hannover.de

NS in the zone

ns1.uni-hannover.de, ns2.uni-hannover.de, ns3.uni-hannover.de

Checks

• ✓ 3 nameservers #6

  Delegated to ns1.uni-hannover.de, ns2.uni-hannover.de, ns3.uni-hannover.de.
• ✓ Parent and zone agree #7

  The parent delegation and the zone's NS records list the same nameservers.
• ✓ Glue present and correct #8

  Glue is published for the nameservers inside the zone: ns1.uni-hannover.de, ns2.uni-hannover.de, ns3.uni-hannover.de.
• ✓ 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 3 IPv4 /24s and 1 IPv6 /48.
• ✓ 2 autonomous systems #11

  The nameservers are spread over: AS24940 (HETZNER-AS - Hetzner Online GmbH, DE): 2 addresses; AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE): 2 addresses.
• i

  All nameserver names under .de

  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
• i

  Partly IPv6

  These nameservers have no IPv6 address: ns1.uni-hannover.de, ns2.uni-hannover.de.

  #13

serial 1510683076 · primary ipam.uni-hannover.de

Found

Primary (MNAME)

ipam.uni-hannover.de

Contact (RNAME)

hostmaster.uni-hannover.de

Serial

1510683076

Refresh / retry

10800 s / 3600 s

Expire

2419200 s

Negative TTL

900 s

Serial per nameserver

Checks

• ✓ Serial 1510683076 everywhere #22

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

  SOA refresh 3h, retry 1h, expire 28d, negative TTL 15m.
• i

  Hidden master

  The primary nameserver ipam.uni-hannover.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@uni-hannover.de #25

  The SOA RNAME hostmaster.uni-hannover.de means hostmaster@uni-hannover.de.
• ✓ Timestamp serial #26

  The serial 1510683076 is a Unix timestamp (2017-11-14 18:11 UTC).