mh-hannover.de

Checked 21 October 2026, 23:22 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

dns-1.dfn.de, nsext1.mh-hannover.de, nsext2.mh-hannover.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns-1.dfn.de, nsext1.mh-hannover.de, nsext2.mh-hannover.de
NS in the zone
dns-1.dfn.de, nsext1.mh-hannover.de, nsext2.mh-hannover.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-
nsext1.mh-hannover.de193.174.104.33AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE193.174.104.33
nsext2.mh-hannover.de193.174.104.34AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE193.174.104.34

Checks

  • ✓ 3 nameservers #6
    Delegated to dns-1.dfn.de, nsext1.mh-hannover.de, nsext2.mh-hannover.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: nsext1.mh-hannover.de, nsext2.mh-hannover.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): 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
  • i
    Partly IPv6
    These nameservers have no IPv6 address: nsext1.mh-hannover.de, nsext2.mh-hannover.de.
    #13

Nameservers

warn

4 of 4 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
nsext1.mh-hannover.de 193.174.104.33NOERROR, 9 ms, authoritativenoyes / yesrefused9.20.21
nsext2.mh-hannover.de 193.174.104.34NOERROR, 9 ms, authoritativenoyes / yesrefused9.20.21

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: nsext1.mh-hannover.de: "9.20.21"; nsext2.mh-hannover.de: "9.20.21". 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 2026091502 · primary nsext1.mh-hannover.de

Found

Primary (MNAME)
nsext1.mh-hannover.de
Contact (RNAME)
inetmaster.mh-hannover.de
Serial
2026091502
Refresh / retry
10800 s / 3600 s
Expire
604800 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
dns-1.dfn.de (193.174.75.50)2026091502
dns-1.dfn.de (2001:638:d:b101::1)2026091502
nsext1.mh-hannover.de (193.174.104.33)2026091502
nsext2.mh-hannover.de (193.174.104.34)2026091502

Checks

  • ✓ Serial 2026091502 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 7d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver nsext1.mh-hannover.de is one of the listed nameservers.
  • ✓ Contact inetmaster@mh-hannover.de #25
    The SOA RNAME inetmaster.mh-hannover.de means inetmaster@mh-hannover.de.
  • ✓ Date-based serial #26
    The serial 2026091502 follows the YYYYMMDDnn convention (2026-09-15).

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

15 records at the apex

Found

Read from
193.174.75.50:53
TypeValueTTL
SOAnsext1.mh-hannover.de. inetmaster.mh-hannover.de. 2026091502 10800 3600 604800 360010800
NSnsext2.mh-hannover.de.10800
NSdns-1.dfn.de.10800
NSnsext1.mh-hannover.de.10800
A193.174.105.7010800
MX0 mhhannover-de0e.mail.protection.outlook.com.10800
TXT"docusign=4516648a-67f7-410c-a956-c20d37857206"10800
TXT"v=spf1 mx ip4:193.174.104.33 ip4:193.174.104.34 ip4:193.174.111.250 a:mailext1.mh-hannover.de a:mailext2.mh-hannover.de ip4:194.95.114.0/26 ip4:193.174.240.41 include:spf.protection.outlook.com include:_spf.kundenserver.de -all"10800
TXT"apple-domain-verification=kaH7WJdekcMZVLQN"10800
TXT"MS=1510AA15A79E9034371548FDA94CD2EA03A83660"10800
TXT"autodesk-domain-verification=kItNOkd4QeBmxsI8CswP"10800
TXT"anny-verification=84fe7869-6ed2-48a7-b3c6-e55ecca487f9"10800
TXT"monday-com-verification=1k3rZbT4O-hijhxTeH0a7r49cCJy_iUZeOjRDICrtHw"10800
CAA0 issue "pki.dfn.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, harica.gr.