fli.de

Checked 21 October 2026, 22:30 UTC · via 8.8.8.8
!Passed with warnings
20 passed 2 warnings 0 failed 7 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

warn

deneb.dfn.de, fli-ex-dns036.fli.de, fli-ex-dns037.fli.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
deneb.dfn.de, fli-ex-dns036.fli.de, fli-ex-dns037.fli.de
NS in the zone
deneb.dfn.de, rie-ex-dns036.fli.de, rie-ex-dns037.fli.de
NameserverAddressesNetwork (AS)Glue
deneb.dfn.de192.76.176.9 2001:638:800:1::9AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
fli-ex-dns036.fli.de (parent only)193.22.112.36AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE193.22.112.36
fli-ex-dns037.fli.de (parent only)193.22.112.37AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE193.22.112.37
rie-ex-dns036.fli.de (zone only)193.22.112.36AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
rie-ex-dns037.fli.de (zone only)193.22.112.37AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-

Checks

  • ✓ 3 nameservers #6
    Delegated to deneb.dfn.de, fli-ex-dns036.fli.de, fli-ex-dns037.fli.de.
  • !
    NS sets differ
    The nameservers at the parent and in the zone should be the same. Only at the parent: fli-ex-dns036.fli.de, fli-ex-dns037.fli.de; only in the zone: rie-ex-dns036.fli.de, rie-ex-dns037.fli.de. deneb.dfn.de, fli-ex-dns036.fli.de, fli-ex-dns037.fli.de, rie-ex-dns036.fli.de, rie-ex-dns037.fli.de report NS deneb.dfn.de rie-ex-dns036.fli.de rie-ex-dns037.fli.de.
    #7
  • ✓ Glue present and correct #8
    Glue is published for the nameservers inside the zone: fli-ex-dns036.fli.de, fli-ex-dns037.fli.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 2 IPv4 /24s and 1 IPv6 /48.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE): 6 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.
    #11
  • 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: fli-ex-dns036.fli.de, fli-ex-dns037.fli.de, rie-ex-dns036.fli.de, rie-ex-dns037.fli.de.
    #13

Nameservers

info

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
deneb.dfn.de 192.76.176.9NOERROR, 18 ms, authoritativenoyes / yesrefused0
deneb.dfn.de 2001:638:800:1::9NOERROR, 18 ms, authoritativenoyes / yesrefused0
fli-ex-dns036.fli.de 193.22.112.36NOERROR, 18 ms, authoritativenoyes / yesrefused-
fli-ex-dns037.fli.de 193.22.112.37NOERROR, 18 ms, authoritativenoyes / yesrefused-
rie-ex-dns036.fli.de 193.22.112.36NOERROR, 18 ms, authoritativenoyes / yesrefused-
rie-ex-dns037.fli.de 193.22.112.37NOERROR, 19 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 6 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: deneb.dfn.de: "0".
    #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.

SOA

pass

serial 2026062301 · primary rie-ex-dns036.fli.de

Found

Primary (MNAME)
rie-ex-dns036.fli.de
Contact (RNAME)
it\.service.fli.de
Serial
2026062301
Refresh / retry
10800 s / 3600 s
Expire
604800 s
Negative TTL
43200 s

Serial per nameserver

NameserverSerial
deneb.dfn.de (192.76.176.9)2026062301
deneb.dfn.de (2001:638:800:1::9)2026062301
fli-ex-dns036.fli.de (193.22.112.36)2026062301
fli-ex-dns037.fli.de (193.22.112.37)2026062301
rie-ex-dns036.fli.de (193.22.112.36)2026062301
rie-ex-dns037.fli.de (193.22.112.37)2026062301

Checks

  • ✓ Serial 2026062301 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 7d, negative TTL 12h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver rie-ex-dns036.fli.de is one of the listed nameservers.
  • ✓ Contact it.service@fli.de #25
    The SOA RNAME it\.service.fli.de means it.service@fli.de.
  • ✓ Date-based serial #26
    The serial 2026062301 follows the YYYYMMDDnn convention (2026-06-23).

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

9 records at the apex

Found

Read from
192.76.176.9:53
TypeValueTTL
SOArie-ex-dns036.fli.de. it\.service.fli.de. 2026062301 10800 3600 604800 4320043200
NSdeneb.dfn.de.43200
NSrie-ex-dns037.fli.de.43200
NSrie-ex-dns036.fli.de.43200
A31.220.122.23843200
MX10 mx021.fli.de.43200
MX10 mx022.fli.de.43200
TXT"MS=DACFB59AFF8EC3F9E186382AFAC2310DC11629C0"43200
TXT"v=spf1 mx ip4:193.22.112.21 ip4:193.22.112.22 ~all"43200

Checks

  • ✓ TTLs within range #32
    TTLs: A 12h, MX 12h, NS 12h. The NS TTL at the parent is 1d and in the zone 12h; 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