ovgu.de

Checked 21 October 2026, 23:42 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

dfnserv1.urz.uni-magdeburg.de, dfnserv2.urz.uni-magdeburg.de, dns-2.dfn.de, dns-3.dfn.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dfnserv1.urz.uni-magdeburg.de, dfnserv2.urz.uni-magdeburg.de, dns-2.dfn.de, dns-3.dfn.de
NS in the zone
dfnserv1.urz.uni-magdeburg.de, dfnserv2.urz.uni-magdeburg.de, dns-2.dfn.de, dns-3.dfn.de
NameserverAddressesNetwork (AS)Glue
dfnserv1.urz.uni-magdeburg.de141.44.1.1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE141.44.1.1
dfnserv2.urz.uni-magdeburg.de141.44.1.2AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE141.44.1.2
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-
dns-3.dfn.de193.174.75.58 2001:638:d:b103::1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-

Checks

  • ✓ 4 nameservers #6
    Delegated to dfnserv1.urz.uni-magdeburg.de, dfnserv2.urz.uni-magdeburg.de, dns-2.dfn.de, dns-3.dfn.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.
  • 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): 6 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: dfnserv1.urz.uni-magdeburg.de, dfnserv2.urz.uni-magdeburg.de.
    #13

Nameservers

info

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dfnserv1.urz.uni-magdeburg.de 141.44.1.1NOERROR, 12 ms, authoritativenoyes / yesrefused-
dfnserv2.urz.uni-magdeburg.de 141.44.1.2NOERROR, 12 ms, authoritativenoyes / yesrefused-
dns-2.dfn.de 193.174.75.54NOERROR, 7 ms, authoritativenoyes / yesrefused0
dns-2.dfn.de 2001:638:d:b102::1NOERROR, 10 ms, authoritativenoyes / yesrefused0
dns-3.dfn.de 193.174.75.58NOERROR, 10 ms, authoritativenoyes / yesrefused0
dns-3.dfn.de 2001:638:d:b103::1NOERROR, 12 ms, authoritativenoyes / yesrefused0

Checks

  • ✓ All respond #14
    All 6 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-2.dfn.de: "0"; dns-3.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 2026102001 · primary dfnserv2.urz.uni-magdeburg.de

Found

Primary (MNAME)
dfnserv2.urz.uni-magdeburg.de
Contact (RNAME)
netmaster.uni-magdeburg.de
Serial
2026102001
Refresh / retry
86400 s / 7200 s
Expire
3600000 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
dfnserv1.urz.uni-magdeburg.de (141.44.1.1)2026102001
dfnserv2.urz.uni-magdeburg.de (141.44.1.2)2026102001
dns-2.dfn.de (193.174.75.54)2026102001
dns-2.dfn.de (2001:638:d:b102::1)2026102001
dns-3.dfn.de (193.174.75.58)2026102001
dns-3.dfn.de (2001:638:d:b103::1)2026102001

Checks

  • ✓ Serial 2026102001 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1d, retry 2h, expire 1000h, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver dfnserv2.urz.uni-magdeburg.de is one of the listed nameservers.
  • ✓ Contact netmaster@uni-magdeburg.de #25
    The SOA RNAME netmaster.uni-magdeburg.de means netmaster@uni-magdeburg.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

info

17 records at the apex

Found

Read from
141.44.1.1:53
TypeValueTTL
SOAdfnserv2.urz.uni-magdeburg.de. netmaster.uni-magdeburg.de. 2026102001 86400 7200 3600000 36003600
NSdfnserv1.urz.uni-magdeburg.de.86400
NSdns-2.dfn.de.86400
NSdns-3.dfn.de.86400
NSdfnserv2.urz.uni-magdeburg.de.86400
A141.44.7.4386400
MX10 c2501.mx.srv.dfn.de.86400
MX10 a2501.mx.srv.dfn.de.86400
MX10 b2501.mx.srv.dfn.de.86400
TXT"google-site-verification=YL-E6c0BWtNAnwWRGtB6fdKpytpi8vz-LFLqgTf--G4"86400
TXT"google-gws-recovery-domain-verification=45574684"86400
TXT"apple-domain-verification=aQWED3fy9GrJgUii"86400
TXT"ZOOM_verify_lytDZO3PSviabtUNFrEOHw"86400
TXT"MS=4C53F47910449A3731462025E79B13BBDF89CA9A"86400
TXT"google-site-verification=CjIB2tvjnbCcPbh3MOB_7oouofMihZP4dAL36zMrv4Y"86400
TXT"v=spf1 a:spf.ovgu.de include:gbv.de ~all"86400
TXT"adobe-idp-site-verification=dc4b7e6df2226e7ff240d67e7d1289c7906b6a2490791855095d7751e2aa9c14"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