uni-halle.de

Checked 22 October 2026, 00:50 UTC · via 8.8.8.8
!Passed with warnings
22 passed 2 warnings 0 failed 5 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

deneb.dfn.de, ns1.uni-halle.de, ns2.uni-halle.de, ns3.uni-halle.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
deneb.dfn.de, ns1.uni-halle.de, ns2.uni-halle.de, ns3.uni-halle.de
NS in the zone
deneb.dfn.de, ns1.uni-halle.de, ns2.uni-halle.de, ns3.uni-halle.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-
ns1.uni-halle.de141.48.3.3AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE141.48.3.3
ns2.uni-halle.de141.48.3.17AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE141.48.3.17
ns3.uni-halle.de141.48.3.51AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE141.48.3.51

Checks

  • ✓ 4 nameservers #6
    Delegated to deneb.dfn.de, ns1.uni-halle.de, ns2.uni-halle.de, ns3.uni-halle.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: ns1.uni-halle.de, ns2.uni-halle.de, ns3.uni-halle.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): 5 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: ns1.uni-halle.de, ns2.uni-halle.de, ns3.uni-halle.de.
    #13

Nameservers

warn

5 of 5 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
deneb.dfn.de 192.76.176.9NOERROR, 14 ms, authoritativenoyes / yesrefused0
deneb.dfn.de 2001:638:800:1::9NOERROR, 14 ms, authoritativenoyes / yesrefused0
ns1.uni-halle.de 141.48.3.3NOERROR, 20 ms, authoritativenoyes / yesrefusedfor you: 0.99 beta ;-)
ns2.uni-halle.de 141.48.3.17NOERROR, 20 ms, authoritativenoyes / yesrefusedfor you: 0.99 beta ;-)
ns3.uni-halle.de 141.48.3.51NOERROR, 20 ms, authoritativenoyes / yesrefusedfor you: 0.99 beta ;-)

Checks

  • ✓ All respond #14
    All 5 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.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: ns1.uni-halle.de: "for you: 0.99 beta ;-)"; ns2.uni-halle.de: "for you: 0.99 beta ;-)"; ns3.uni-halle.de: "for you: 0.99 beta ;-)". Hide or replace the version string.
    #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 2026102001 · primary ns1.uni-halle.de

Found

Primary (MNAME)
ns1.uni-halle.de
Contact (RNAME)
dns-admin.itz.uni-halle.de
Serial
2026102001
Refresh / retry
10800 s / 1800 s
Expire
1209600 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
deneb.dfn.de (192.76.176.9)2026102001
deneb.dfn.de (2001:638:800:1::9)2026102001
ns1.uni-halle.de (141.48.3.3)2026102001
ns2.uni-halle.de (141.48.3.17)2026102001
ns3.uni-halle.de (141.48.3.51)2026102001

Checks

  • ✓ Serial 2026102001 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 30m, expire 14d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.uni-halle.de is one of the listed nameservers.
  • ✓ Contact dns-admin@itz.uni-halle.de #25
    The SOA RNAME dns-admin.itz.uni-halle.de means dns-admin@itz.uni-halle.de.
  • ✓ Date-based serial #26
    The serial 2026102001 follows the YYYYMMDDnn convention (2026-10-20).

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

21 records at the apex

Found

Read from
192.76.176.9:53
TypeValueTTL
SOAns1.uni-halle.de. dns-admin.itz.uni-halle.de. 2026102001 10800 1800 1209600 360010800
NSns1.uni-halle.de.10800
NSdeneb.dfn.de.10800
NSns3.uni-halle.de.10800
NSns2.uni-halle.de.10800
A141.48.4.23010800
MX50 c2641.mx.srv.dfn.de.10800
MX50 b2641.mx.srv.dfn.de.10800
MX50 a2641.mx.srv.dfn.de.10800
TXT"cisco-ci-domain-verification=437bea693fb34b5f583b00802ef10e4a5d39d53ed3d46d0c0056dacbaeef8738" "a"10800
TXT"HARICA-uGvi8HzPJvTdtViprCa"10800
TXT"apple-domain-verification=6LlKR8J49GiBccMY"10800
TXT"v=spf1 mx a:mout1.uni-halle.de a:mout2.uni-halle.de a:mout3.uni-halle.de ~all"10800
TXT"MS=ms46504434"10800
TXT"f9c934ac61dd073d226316b5a097306e"10800
TXT"academiccloud-site-verification=fxnjeCSH26x6pCD9PX8q8fdyd"10800
TXT"google-site-verification=GlrP2Dj82Z1DuV2tXeByvkUTzTkVjhQ0eRwSBnaHbIw"10800
CAA0 issue "pki.dfn.de"10800
CAA0 issue "sectigo.com"10800
CAA0 iodef "mailto:pki@uni-halle.de"10800
CAA0 issue "harica.gr"10800

Checks

  • ✓ TTLs within range #32
    TTLs: A 3h, MX 3h, NS 3h. The NS TTL at the parent is 1d and in the zone 3h; 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: pki.dfn.de, sectigo.com, harica.gr.