ukgm.de

Checked 22 October 2026, 00:50 UTC · via 8.8.8.8
✗Problems found
20 passed 3 warnings 1 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.globvill.de, imisunf01.med.uni-giessen.de, imisunf03.med.uni-giessen.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns.globvill.de, imisunf01.med.uni-giessen.de, imisunf03.med.uni-giessen.de
NS in the zone
dns.globvill.de, imisunf01.med.uni-giessen.de, imisunf03.med.uni-giessen.de
NameserverAddressesNetwork (AS)Glue
dns.globvill.de212.20.191.2 2001:40b8::22AS13039 GLOBAL-VILLAGE - Global Village GmbH, DE AS13039 GLOBAL-VILLAGE - Global Village GmbH, DE-
imisunf01.med.uni-giessen.de141.50.161.11AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
imisunf03.med.uni-giessen.de141.50.161.12AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-

Checks

  • ✓ 3 nameservers #6
    Delegated to dns.globvill.de, imisunf01.med.uni-giessen.de, imisunf03.med.uni-giessen.de.
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • ✓ No glue needed #8
    All nameservers are outside the zone, so no glue records are needed.
  • ✓ 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.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS13039 (GLOBAL-VILLAGE - Global Village GmbH, DE): 2 addresses; AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE): 2 addresses.
  • 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: imisunf01.med.uni-giessen.de, imisunf03.med.uni-giessen.de.
    #13

Nameservers

fail

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns.globvill.de 212.20.191.2NOERROR, 7 ms, authoritativenoyes / yesrefuseddns
dns.globvill.de 2001:40b8::22NOERROR, 7 ms, authoritativenoyes / yesrefuseddns
imisunf01.med.uni-giessen.de 141.50.161.11NOERROR, 12 ms, authoritativenoyes / yesALLOWED (38 records)9.9.5-3ubuntu0.1-Ubuntu
imisunf03.med.uni-giessen.de 141.50.161.12NOERROR, 12 ms, authoritativenoyes / yesALLOWED (38 records)9.9.5-3ubuntu0.1-Ubuntu

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: imisunf01.med.uni-giessen.de: "9.9.5-3ubuntu0.1-Ubuntu"; imisunf03.med.uni-giessen.de: "9.9.5-3ubuntu0.1-Ubuntu". Hide or replace the version string.
    #17
  • ✗
    Zone transfer allowed
    These nameservers send the complete zone to anyone who asks (AXFR), exposing all host names: imisunf01.med.uni-giessen.de (141.50.161.11): 38 records; imisunf03.med.uni-giessen.de (141.50.161.12): 38 records. Restrict zone transfers to your secondary servers.
    #18
  • ✓ 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

warn

serial 2026091117 · primary imisunf01.med.uni-giessen.de

Found

Primary (MNAME)
imisunf01.med.uni-giessen.de
Contact (RNAME)
root.imisunf01.med.uni-giessen.de
Serial
2026091117
Refresh / retry
21600 s / 1800 s
Expire
604800 s
Negative TTL
172800 s

Serial per nameserver

NameserverSerial
dns.globvill.de (212.20.191.2)2026091117
dns.globvill.de (2001:40b8::22)2026091117
imisunf01.med.uni-giessen.de (141.50.161.11)2026091117
imisunf03.med.uni-giessen.de (141.50.161.12)2026091117

Checks

  • ✓ Serial 2026091117 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    negative caching TTL (minimum) 2d is outside 5m–1d (RFC 2308 recommends 1–3 hours). Current values: refresh 6h, retry 30m, expire 7d, negative TTL 2d.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver imisunf01.med.uni-giessen.de is one of the listed nameservers.
  • ✓ Contact root@imisunf01.med.uni-giessen.de #25
    The SOA RNAME root.imisunf01.med.uni-giessen.de means root@imisunf01.med.uni-giessen.de.
  • ✓ Date-based serial #26
    The serial 2026091117 follows the YYYYMMDDnn convention (2026-09-11).

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

10 records at the apex

Found

Read from
212.20.191.2:53
TypeValueTTL
SOAimisunf01.med.uni-giessen.de. root.imisunf01.med.uni-giessen.de. 2026091117 21600 1800 604800 172800172800
NSdns.globvill.de.172800
NSimisunf03.med.uni-giessen.de.172800
NSimisunf01.med.uni-giessen.de.172800
A141.50.60.33172800
MX10 mx-in.global-village.de.172800
MX10 mail2.uk-gm.de.172800
MX10 mail.uk-gm.de.172800
TXT"v=spf1 mx a:smtp.global-village.de a:mx-out.global-village.de -all"172800
TXT"apple-domain-verification=1kX4VdRVZsJQXZdx"172800

Checks

  • ✓ TTLs within range #32
    TTLs: A 2d, MX 2d, NS 2d. The NS TTL at the parent is 1d and in the zone 2d; 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.
  • 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