ufz.de

Checked 22 October 2026, 00:50 UTC · via 8.8.8.8
!Passed with warnings
21 passed 1 warning 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

info

dns-1.dfn.de, dns-3.dfn.de, ns3.ufz.de, ns4.ufz.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns-1.dfn.de, dns-3.dfn.de, ns3.ufz.de, ns4.ufz.de
NS in the zone
dns-1.dfn.de, dns-3.dfn.de, ns3.ufz.de, ns4.ufz.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-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.ufz.de141.65.250.13AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE141.65.250.13
ns4.ufz.de141.65.250.14AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE141.65.250.14

Checks

  • ✓ 4 nameservers #6
    Delegated to dns-1.dfn.de, dns-3.dfn.de, ns3.ufz.de, ns4.ufz.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.ufz.de, ns4.ufz.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): 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: ns3.ufz.de, ns4.ufz.de.
    #13

Nameservers

info

6 of 6 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-3.dfn.de 193.174.75.58NOERROR, 10 ms, authoritativenoyes / yesrefused0
dns-3.dfn.de 2001:638:d:b103::1NOERROR, 8 ms, authoritativenoyes / yesrefused0
ns3.ufz.de 141.65.250.13NOERROR, 15 ms, authoritativenoyes / yesrefusednot specified
ns4.ufz.de 141.65.250.14NOERROR, 15 ms, authoritativenoyes / yesrefusednot specified

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: dns-1.dfn.de: "0"; dns-3.dfn.de: "0"; ns3.ufz.de: "not specified"; ns4.ufz.de: "not specified".
    #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 2026100100 · primary ns3.ufz.de

Found

Primary (MNAME)
ns3.ufz.de
Contact (RNAME)
hostmaster.ufz.de
Serial
2026100100
Refresh / retry
43200 s / 3600 s
Expire
2419200 s
Negative TTL
18000 s

Serial per nameserver

NameserverSerial
dns-1.dfn.de (193.174.75.50)2026100100
dns-1.dfn.de (2001:638:d:b101::1)2026100100
dns-3.dfn.de (193.174.75.58)2026100100
dns-3.dfn.de (2001:638:d:b103::1)2026100100
ns3.ufz.de (141.65.250.13)2026100100
ns4.ufz.de (141.65.250.14)2026100100

Checks

  • ✓ Serial 2026100100 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 12h, retry 1h, expire 28d, negative TTL 5h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns3.ufz.de is one of the listed nameservers.
  • ✓ Contact hostmaster@ufz.de #25
    The SOA RNAME hostmaster.ufz.de means hostmaster@ufz.de.
  • ✓ Date-based serial #26
    The serial 2026100100 follows the YYYYMMDDnn convention (2026-10-01).

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

pass

18 records at the apex

Found

Read from
193.174.75.50:53
TypeValueTTL
SOAns3.ufz.de. hostmaster.ufz.de. 2026100100 43200 3600 2419200 180003600
NSns4.ufz.de.3600
NSdns-1.dfn.de.3600
NSdns-3.dfn.de.3600
NSns3.ufz.de.3600
MX10 a1881.mx.srv.dfn.de.3600
MX10 c1881.mx.srv.dfn.de.3600
MX10 b1881.mx.srv.dfn.de.3600
TXT"MS=ms77574902"3600
TXT"apple-domain-verification=0QXMxzTFgTFSsq7H"3600
TXT"crsend._domainkey.ufz.de v=DKIM1; k=rsa; p=" "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAzVYD3HQ3OmDMS4N3h4j2xt4QxP8IyaVS8jFGGjtUc5gyYL2MBtK+1v" "OBNtMXXCdFxbkHr1S7zbrWw/U45iktPmX92Huau5d2Q2JcBlL5olS3StfWz0PyiADTNkRZ0IDLPjNSClIbPop9X/XHH2EBQwWf" "nXalGnRsXteLViVxrkLBqdIHlZmp8LQBJCcT6ysCgqndEKRFA0cluSLNreit7xU/kV9pX5JFNn5xovcki3ESlSZPs09whyn1Gx" "YTiQL969GbWbtbckzr2R+jrOXX8XekaiD3ejKw42mXTGtObFF5ND8uvmIzLxj4e7JBBga/7yW+7rChdFMrqBdJdm6WNQIDAQAB"3600
TXT"google-site-verification=S5I5ibeKFcfX4t1XtyMurGVqQJWesdCGaFwYDDNrrA8"3600
TXT"atlassian-domain-verification=cluMOGwehM9bh0yWxGILWqlfacOe6d65I1w4ERmfrUzJTUbrWT5SA0ksenM7UDNF"3600
TXT"v=spf1 a:mailgate.ufz.de a:mailgate1.ufz.de a:mailgate2.ufz.de ip4:141.65.250.118 ip4:141.65.250.71 ip4:141.65.250.72 include:spf.de.umantis.com ~all"3600
CAA0 issue "sectigo.com"3600
CAA0 issue "harica.gr"3600
CAA0 issue "letsencrypt.org"3600
CAA0 issue "pki.dfn.de"3600

Checks

  • ✓ TTLs within range #32
    TTLs: 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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: sectigo.com, harica.gr, letsencrypt.org, pki.dfn.de.