irbnet.de

Checked 21 October 2026, 23:00 UTC · via 8.8.8.8
!Passed with warnings
24 passed 1 warning 0 failed 4 info

Registration

info

.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

Delegation

info

ns1.fraunhofer.de, ns2.fraunhofer.de, ns3.fraunhofer.de, ns5.fraunhofer.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns1.fraunhofer.de, ns2.fraunhofer.de, ns3.fraunhofer.de, ns5.fraunhofer.de
NS in the zone
ns1.fraunhofer.de, ns2.fraunhofer.de, ns3.fraunhofer.de, ns5.fraunhofer.de
NameserverAddressesNetwork (AS)Glue
ns1.fraunhofer.de192.44.37.1 2a03:db80:3004:d212::53:1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE192.44.37.1 2a03:db80:3004:d212::53:1
ns2.fraunhofer.de153.96.1.1 2a03:db80:4420:b000::53:1AS5501 Fraunhofer-Cluster-BW - Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V., DE AS5501 Fraunhofer-Cluster-BW - Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V., DE153.96.1.1 2a03:db80:4420:b000::53:1
ns3.fraunhofer.de153.96.87.2 2a03:db80:0:d200::53:1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE153.96.87.2 2a03:db80:0:d200::53:1
ns5.fraunhofer.de192.102.167.2 2a03:db80:1504:d267::53:1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE192.102.167.2 2a03:db80:1504:d267::53:1

Checks

  • ✓ 4 nameservers #6
    Delegated to ns1.fraunhofer.de, ns2.fraunhofer.de, ns3.fraunhofer.de, ns5.fraunhofer.de.
  • ✓ 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 4 IPv4 /24s and 4 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS5501 (Fraunhofer-Cluster-BW - Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V., DE): 2 addresses; AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE): 6 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
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

pass

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.fraunhofer.de 192.44.37.1NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns1.fraunhofer.de 2a03:db80:3004:d212::53:1NOERROR, 14 ms, authoritativenoyes / yesrefused-
ns2.fraunhofer.de 153.96.1.1NOERROR, 8 ms, authoritativenoyes / yesrefused-
ns2.fraunhofer.de 2a03:db80:4420:b000::53:1NOERROR, 6 ms, authoritativenoyes / yesrefused-
ns3.fraunhofer.de 153.96.87.2NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns3.fraunhofer.de 2a03:db80:0:d200::53:1NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns5.fraunhofer.de 192.102.167.2NOERROR, 14 ms, authoritativenoyes / yesrefused-
ns5.fraunhofer.de 2a03:db80:1504:d267::53:1NOERROR, 15 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 8 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.
  • ✓ No version disclosed #17
    The nameservers don't reveal their software version.
  • ✓ 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.

SOA

pass

serial 2020112027 · primary ns2.fraunhofer.de

Found

Primary (MNAME)
ns2.fraunhofer.de
Contact (RNAME)
servicedesk.fraunhofer.de
Serial
2020112027
Refresh / retry
1200 s / 180 s
Expire
1209600 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
ns1.fraunhofer.de (192.44.37.1)2020112027
ns1.fraunhofer.de (2a03:db80:3004:d212::53:1)2020112027
ns2.fraunhofer.de (153.96.1.1)2020112027
ns2.fraunhofer.de (2a03:db80:4420:b000::53:1)2020112027
ns3.fraunhofer.de (153.96.87.2)2020112027
ns3.fraunhofer.de (2a03:db80:0:d200::53:1)2020112027
ns5.fraunhofer.de (192.102.167.2)2020112027
ns5.fraunhofer.de (2a03:db80:1504:d267::53:1)2020112027

Checks

  • ✓ Serial 2020112027 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 20m, retry 3m, expire 14d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns2.fraunhofer.de is one of the listed nameservers.
  • ✓ Contact servicedesk@fraunhofer.de #25
    The SOA RNAME servicedesk.fraunhofer.de means servicedesk@fraunhofer.de.
  • ✓ Date-based serial #26
    The serial 2020112027 follows the YYYYMMDDnn convention (2020-11-20).

DNSSEC

warn

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

Records

info

7 records at the apex

Found

Read from
192.44.37.1:53
TypeValueTTL
SOAns2.fraunhofer.de. servicedesk.fraunhofer.de. 2020112027 1200 180 1209600 360086400
NSns1.fraunhofer.de.86400
NSns3.fraunhofer.de.86400
NSns2.fraunhofer.de.86400
NSns5.fraunhofer.de.86400
A129.233.84.286400
TXT"HARICA-utGC7LGOQURQmUM9t9A"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 1d, NS 1d.
  • ✓ No CNAME at the apex #33
    The zone apex has no CNAME record.
  • ✓ No wildcard #34
    Names that don't exist return NXDOMAIN.
  • i
    No CAA records
    Without CAA records any certificate authority may issue certificates for this domain. A CAA record limits issuance to the CAs you use.
    #35