dlr.de

Checked 21 October 2026, 22:14 UTC · via 8.8.8.8
!Passed with warnings
20 passed 1 warning 0 failed 8 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

dns-1.dfn.de, dns-2.dfn.de, dns-3.dfn.de, ns3.dlr.de, ns4.dlr.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns-1.dfn.de, dns-2.dfn.de, dns-3.dfn.de, ns3.dlr.de, ns4.dlr.de
NS in the zone
dns-1.dfn.de, dns-2.dfn.de, dns-3.dfn.de, ns3.dlr.de, ns4.dlr.de
NameserverAddressesNetwork (AS)Glue
dns-1.dfn.de193.174.75.50 2001:638:d:b101::1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
dns-2.dfn.de193.174.75.54 2001:638:d:b102::1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
dns-3.dfn.de193.174.75.58 2001:638:d:b103::1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
ns3.dlr.de194.94.201.125AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE194.94.201.125
ns4.dlr.de194.94.201.126AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE194.94.201.126

Checks

  • ✓ 5 nameservers #6
    Delegated to dns-1.dfn.de, dns-2.dfn.de, dns-3.dfn.de, ns3.dlr.de, ns4.dlr.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: ns3.dlr.de, ns4.dlr.de.
  • ✓ All names resolve #9
    Every nameserver name has an address and is not an alias.
  • i
    One address family in one network
    all IPv6 addresses are in 2001:638:d::/48, while the other address family is spread over several networks.
    #10
  • 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): 8 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: ns3.dlr.de, ns4.dlr.de.
    #13

Nameservers

info

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns-1.dfn.de 193.174.75.50NOERROR, 14 ms, authoritativenoyes / yesrefused0
dns-1.dfn.de 2001:638:d:b101::1NOERROR, 13 ms, authoritativenoyes / yesrefused0
dns-2.dfn.de 193.174.75.54NOERROR, 7 ms, authoritativenoyes / yesrefused0
dns-2.dfn.de 2001:638:d:b102::1NOERROR, 7 ms, authoritativenoyes / yesrefused0
dns-3.dfn.de 193.174.75.58NOERROR, 8 ms, authoritativenoyes / yesrefused0
dns-3.dfn.de 2001:638:d:b103::1NOERROR, 8 ms, authoritativenoyes / yesrefused0
ns3.dlr.de 194.94.201.125NOERROR, 12 ms, authoritativenoyes / yesrefused-
ns4.dlr.de 194.94.201.126NOERROR, 13 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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: dns-1.dfn.de: "0"; dns-2.dfn.de: "0"; dns-3.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 2018053836 · primary ns3.dlr.de

Found

Primary (MNAME)
ns3.dlr.de
Contact (RNAME)
dnsmaster.dlr.de
Serial
2018053836
Refresh / retry
10800 s / 3600 s
Expire
1814400 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
dns-1.dfn.de (193.174.75.50)2018053836
dns-1.dfn.de (2001:638:d:b101::1)2018053836
dns-2.dfn.de (193.174.75.54)2018053836
dns-2.dfn.de (2001:638:d:b102::1)2018053836
dns-3.dfn.de (193.174.75.58)2018053836
dns-3.dfn.de (2001:638:d:b103::1)2018053836
ns3.dlr.de (194.94.201.125)2018053836
ns4.dlr.de (194.94.201.126)2018053836

Checks

  • ✓ Serial 2018053836 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 21d, negative TTL 30m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns3.dlr.de is one of the listed nameservers.
  • ✓ Contact dnsmaster@dlr.de #25
    The SOA RNAME dnsmaster.dlr.de means dnsmaster@dlr.de.
  • ✓ Timestamp serial #26
    The serial 2018053836 is a Unix timestamp (2033-12-13 02:30 UTC).

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

21 records at the apex

Found

Read from
193.174.75.50:53
TypeValueTTL
SOAns3.dlr.de. dnsmaster.dlr.de. 2018053836 10800 3600 1814400 18007200
NSdns-1.dfn.de.7200
NSdns-2.dfn.de.7200
NSns4.dlr.de.7200
NSns3.dlr.de.7200
NSdns-3.dfn.de.7200
A194.94.201.303600
MX10 mailin.dlr.de.600
TXT"MS=E9410EC7E6BA177C32F2456EF80EDF52DC65EED5"300
TXT"zone-ownership-verification-0ba214405c9835dfe8a1c16c266f865616dd69e1dbd3c31c6dd4ebd8287f6b7e"300
TXT"apple-domain-verification=k5TjvcoYmt5Bfejc"300
TXT"google-site-verification=Qygvkz5D16bz6MgHFShwReH95oxmzqR1nSVKEk106s8"300
TXT"MS=ms32953597"300
TXT"OSSRH-53474"300
TXT"HARICA-tyNT5a7DBeOPJ4Urq7E"300
TXT"MS=ms99685526"300
TXT"v=spf1 mx -all"300
TXT"apple-domain-verification=9OdBZwFC9B8H4QhP"300
TXT"google-gws-recovery-domain-verification=52485859"300
TXT"google-site-verification=wHkXyYZAbPzHPSE3panC81CYJnYFGaXCWpw_KQuJeWQ"300
TXT"zone-ownership-verification-7093224593846186e0ae328b3c6d6c5f6a8cce2dc6eda3d8cf0f83fda6525486"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 1h, MX 10m, NS 2h. The NS TTL at the parent is 1d and in the zone 2h; 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