fhg.de

Checked 21 October 2026, 22:30 UTC · via 8.8.8.8
!Passed with warnings
28 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, 14 ms, authoritativenoyes / yesrefused-
ns1.fraunhofer.de 2a03:db80:3004:d212::53:1NOERROR, 14 ms, authoritativenoyes / yesrefused-
ns2.fraunhofer.de 153.96.1.1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns2.fraunhofer.de 2a03:db80:4420:b000::53:1NOERROR, 9 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, 15 ms, authoritativenoyes / yesrefused-
ns5.fraunhofer.de 2a03:db80:1504:d267::53:1NOERROR, 16 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 2009432770 · primary ns2.fraunhofer.de

Found

Primary (MNAME)
ns2.fraunhofer.de
Contact (RNAME)
servicedesk.fraunhofer.de
Serial
2009432770
Refresh / retry
3600 s / 600 s
Expire
1209600 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
ns1.fraunhofer.de (192.44.37.1)2009432770
ns1.fraunhofer.de (2a03:db80:3004:d212::53:1)2009432770
ns2.fraunhofer.de (153.96.1.1)2009432770
ns2.fraunhofer.de (2a03:db80:4420:b000::53:1)2009432770
ns3.fraunhofer.de (153.96.87.2)2009432770
ns3.fraunhofer.de (2a03:db80:0:d200::53:1)2009432770
ns5.fraunhofer.de (192.102.167.2)2009432770
ns5.fraunhofer.de (2a03:db80:1504:d267::53:1)2009432770

Checks

  • ✓ Serial 2009432770 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1h, retry 10m, 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.
  • ✓ Timestamp serial #26
    The serial 2009432770 is a Unix timestamp (2033-09-04 07:46 UTC).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver
yes
Denial of existence
NSEC3
NSEC3
10 iterations, 16-byte salt
Signatures valid until
13 November 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
55358ECDSAP256SHA256 (13)SHA256 6788DABA9B969EAD…yes

DNSKEY in the zone

Key tagRoleAlgorithm
55358KSK (257)ECDSAP256SHA256 (13)
40276ZSK (256)ECDSAP256SHA256 (13)
47898ZSK (256)ECDSAP256SHA256 (13)

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 55358 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: ECDSAP256SHA256 (13).
  • ✓ Signatures valid until 2026-11-13 #30
    The earliest DNSKEY/SOA signature expires at 2026-11-13 07:48 UTC.
  • !
    NSEC3 with extra iterations or salt
    NSEC3 uses 10 iterations and a 16-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

Records

info

12 records at the apex

Found

Read from
192.44.37.1:53
TypeValueTTL
SOAns2.fraunhofer.de. servicedesk.fraunhofer.de. 2009432770 3600 600 1209600 36003600
NSns2.fraunhofer.de.3600
NSns5.fraunhofer.de.3600
NSns1.fraunhofer.de.3600
NSns3.fraunhofer.de.3600
A192.102.162.2363600
MX20 edge02.mx.fraunhofer.de.3600
MX30 edge03.mx.fraunhofer.de.3600
MX40 edge04.mx.fraunhofer.de.3600
MX10 edge01.mx.fraunhofer.de.3600
TXT"docusign=07ae7902-46cd-4d59-8d0a-4fcaca71a80c"3600
TXT"v=spf1 redirect=_spf.fraunhofer.de"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 1h, MX 1h, NS 1h. The NS TTL at the parent is 1d and in the zone 1h; resolvers may use either.
  • ✓ 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