uni-marburg.de

Checked 22 October 2026, 00:50 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, dnsp.uni-marburg.de, dnss1.uni-marburg.de, dnss2.uni-marburg.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, dnsp.uni-marburg.de, dnss1.uni-marburg.de, dnss2.uni-marburg.de
NS in the zone
dns-1.dfn.de, dns-2.dfn.de, dnsp.uni-marburg.de, dnss1.uni-marburg.de, dnss2.uni-marburg.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-
dnsp.uni-marburg.de137.248.1.8AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE137.248.1.8
dnss1.uni-marburg.de137.248.1.5AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE137.248.1.5
dnss2.uni-marburg.de137.248.21.22AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE137.248.21.22

Checks

  • ✓ 5 nameservers #6
    Delegated to dns-1.dfn.de, dns-2.dfn.de, dnsp.uni-marburg.de, dnss1.uni-marburg.de, dnss2.uni-marburg.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: dnsp.uni-marburg.de, dnss1.uni-marburg.de, dnss2.uni-marburg.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): 7 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: dnsp.uni-marburg.de, dnss1.uni-marburg.de, dnss2.uni-marburg.de.
    #13

Nameservers

info

7 of 7 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns-1.dfn.de 193.174.75.50NOERROR, 12 ms, authoritativenoyes / yesrefused0
dns-1.dfn.de 2001:638:d:b101::1NOERROR, 12 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
dnsp.uni-marburg.de 137.248.1.8NOERROR, 8 ms, authoritativenoyes / yesrefused-
dnss1.uni-marburg.de 137.248.1.5NOERROR, 5 ms, authoritativenoyes / yesrefused-
dnss2.uni-marburg.de 137.248.21.22NOERROR, 5 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 7 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".
    #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 2026102202 · primary dnsp.uni-marburg.de

Found

Primary (MNAME)
dnsp.uni-marburg.de
Contact (RNAME)
umrnet-team.hrz.uni-marburg.de
Serial
2026102202
Refresh / retry
18000 s / 1800 s
Expire
3600000 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
dns-1.dfn.de (193.174.75.50)2026102202
dns-1.dfn.de (2001:638:d:b101::1)2026102202
dns-2.dfn.de (193.174.75.54)2026102202
dns-2.dfn.de (2001:638:d:b102::1)2026102202
dnsp.uni-marburg.de (137.248.1.8)2026102202
dnss1.uni-marburg.de (137.248.1.5)2026102202
dnss2.uni-marburg.de (137.248.21.22)2026102202

Checks

  • ✓ Serial 2026102202 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 5h, retry 30m, expire 1000h, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver dnsp.uni-marburg.de is one of the listed nameservers.
  • ✓ Contact umrnet-team@hrz.uni-marburg.de #25
    The SOA RNAME umrnet-team.hrz.uni-marburg.de means umrnet-team@hrz.uni-marburg.de.
  • ✓ Date-based serial #26
    The serial 2026102202 follows the YYYYMMDDnn convention (2026-10-22).

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

16 records at the apex

Found

Read from
193.174.75.50:53
TypeValueTTL
SOADNSp.Uni-Marburg.DE. umrnet-team.HRZ.Uni-Marburg.DE. 2026102202 18000 1800 3600000 8640086400
NSDNSs2.Uni-Marburg.DE.86400
NSDNSp.Uni-Marburg.DE.86400
NSdns-2.dfn.de.86400
NSdns-1.dfn.de.86400
NSDNSs1.Uni-Marburg.DE.86400
A137.248.1.3286400
MX10 b2111.mx.srv.dfn.de.86400
MX10 c2111.mx.srv.dfn.de.86400
MX10 a2111.mx.srv.dfn.de.86400
TXT"google-site-verification=dPK5zVQ_-_Kj4Lto7ZrEEsah0_Sp6ovYiQ0lpHDecjg"86400
TXT"v=spf1 include:_spf.uni-marburg.de include:_spf.plan.io ~all"86400
TXT"brevo-code:8f4aeb3ec6752842e560cc22add86ff0"86400
TXT"academiccloud-site-verification=8gpHmA9wq6R4FX4HkRSST9txP"86400
TXT"_telesec-domain-validation=341660_2025-10-14_xEcNUPL56MiQiAv3lB2BXPpLgJVJjWzhqT4nxdzYOOg3cnP7lH"86400
TXT"adobe-idp-site-verification=b3e4658a43e3581cbd3d8000f218c36b3f5cbc0597144eda523de73a4dbf7788"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 1d, MX 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