hs-merseburg.de

Checked 21 October 2026, 22:51 UTC · via 8.8.8.8
!Passed with warnings
20 passed 4 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

warn

deneb.dfn.de, ns.hs-merseburg.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
deneb.dfn.de, ns.hs-merseburg.de
NS in the zone
deneb.dfn.de, ns.hs-merseburg.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-
ns.hs-merseburg.de149.205.5.50 2001:638:912:105::50AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE149.205.5.50

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: deneb.dfn.de, ns.hs-merseburg.de.
    #6
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • !
    Glue differs from the zone
    The addresses at the parent (glue) differ from the addresses in the zone: ns.hs-merseburg.de (glue 149.205.5.50, zone 149.205.5.50, 2001:638:912:105::50). Update the glue at your registrar.
    #8
  • ✓ 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 2 IPv6 /48s.
  • 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): 4 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
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

warn

4 of 4 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
ns.hs-merseburg.de 149.205.5.50NOERROR, 13 ms, authoritativenoyes / yesrefused9.16.23-RH
ns.hs-merseburg.de 2001:638:912:105::50NOERROR, 13 ms, authoritativenoyes / yesrefused9.16.23-RH

Checks

  • ✓ All respond #14
    All 4 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: ns.hs-merseburg.de: "9.16.23-RH". 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 2026093000 · primary ns.hs-merseburg.de

Found

Primary (MNAME)
ns.hs-merseburg.de
Contact (RNAME)
netadmin.hs-merseburg.de
Serial
2026093000
Refresh / retry
10000 s / 1800 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
deneb.dfn.de (192.76.176.9)2026093000
deneb.dfn.de (2001:638:800:1::9)2026093000
ns.hs-merseburg.de (149.205.5.50)2026093000
ns.hs-merseburg.de (2001:638:912:105::50)2026093000

Checks

  • ✓ Serial 2026093000 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 2h46m40s, retry 30m, expire 7d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns.hs-merseburg.de is one of the listed nameservers.
  • ✓ Contact netadmin@hs-merseburg.de #25
    The SOA RNAME netadmin.hs-merseburg.de means netadmin@hs-merseburg.de.
  • ✓ Date-based serial #26
    The serial 2026093000 follows the YYYYMMDDnn convention (2026-09-30).

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

warn

15 records at the apex

Found

Read from
192.76.176.9:53
TypeValueTTL
SOAns.hs-merseburg.de. netadmin.hs-merseburg.de. 2026093000 10000 1800 604800 8640086400
NSdeneb.dfn.de.86400
NSns.hs-merseburg.de.86400
A149.205.4.19300
AAAA2001:638:912:f41::19300
MX10 mx1.hs-merseburg.de.60
MX60 mx2.hs-merseburg.de.60
TXT"adobe-idp-site-verification=7ca871f0c7a697281d14843f7e486dfe455c2777b1188c450bcda99eba126492"300
TXT"HARICA-nAwukQC57vVmDmYTJ89"300
TXT"v=spf1 include:_spf.hs-merseburg.de include:_spf.o320.mx.srv.dfn.de include:gbv.de -all"300
CAA0 issue "harica.gr"86400
CAA0 issue "pki.dfn.de"86400
CAA0 issuewild "harica.gr"86400
CAA0 iodef "ca@hs-merseburg.de"86400
CAA0 issue "sectigo.com"86400

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: MX (1m). Low TTLs are useful just before a planned change.
    #32
  • ✓ 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: harica.gr, pki.dfn.de, sectigo.com.