ostfalia.de

Checked 21 October 2026, 23:42 UTC · via 8.8.8.8
!Passed with warnings
21 passed 2 warnings 0 failed 6 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

dns-1.serv.uni-osnabrueck.de, dns1.sonia.de, dns2.sonia.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns-1.serv.uni-osnabrueck.de, dns1.sonia.de, dns2.sonia.de
NS in the zone
dns-1.serv.uni-osnabrueck.de, dns1.sonia.de, dns2.sonia.de
NameserverAddressesNetwork (AS)Glue
dns-1.serv.uni-osnabrueck.de131.173.245.1 2001:638:508:f50::83ad:f501AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE131.173.245.1 2001:638:508:f50::83ad:f501
dns1.sonia.de141.41.1.250 2001:638:60a:a001::250AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE141.41.1.250
dns2.sonia.de141.41.1.150 2001:638:60a:a001::150AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE141.41.1.150

Checks

  • ✓ 3 nameservers #6
    Delegated to dns-1.serv.uni-osnabrueck.de, dns1.sonia.de, dns2.sonia.de.
  • ✓ 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: dns1.sonia.de (glue 141.41.1.250, zone 141.41.1.250, 2001:638:60a:a001::250); dns2.sonia.de (glue 141.41.1.150, zone 141.41.1.150, 2001:638:60a:a001::150). 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): 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
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

info

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns-1.serv.uni-osnabrueck.de 131.173.245.1NOERROR, 16 ms, authoritativenoyes / yesrefused-
dns-1.serv.uni-osnabrueck.de 2001:638:508:f50::83ad:f501NOERROR, 17 ms, authoritativenoyes / yesrefused-
dns1.sonia.de 141.41.1.250NOERROR, 14 ms, authoritativenoyes / yesrefusednone
dns1.sonia.de 2001:638:60a:a001::250NOERROR, 15 ms, authoritativenoyes / yesrefusednone
dns2.sonia.de 141.41.1.150NOERROR, 17 ms, authoritativenoyes / yesrefusednone
dns2.sonia.de 2001:638:60a:a001::150NOERROR, 14 ms, authoritativenoyes / yesrefusednone

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: dns1.sonia.de: "none"; dns2.sonia.de: "none".
    #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 2026100802 · primary dns1.sonia.de

Found

Primary (MNAME)
dns1.sonia.de
Contact (RNAME)
hostmaster.sonia.de
Serial
2026100802
Refresh / retry
21600 s / 2700 s
Expire
2419200 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
dns-1.serv.uni-osnabrueck.de (131.173.245.1)2026100802
dns-1.serv.uni-osnabrueck.de (2001:638:508:f50::83ad:f501)2026100802
dns1.sonia.de (141.41.1.250)2026100802
dns1.sonia.de (2001:638:60a:a001::250)2026100802
dns2.sonia.de (141.41.1.150)2026100802
dns2.sonia.de (2001:638:60a:a001::150)2026100802

Checks

  • ✓ Serial 2026100802 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 6h, retry 45m, expire 28d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver dns1.sonia.de is one of the listed nameservers.
  • ✓ Contact hostmaster@sonia.de #25
    The SOA RNAME hostmaster.sonia.de means hostmaster@sonia.de.
  • ✓ Date-based serial #26
    The serial 2026100802 follows the YYYYMMDDnn convention (2026-10-08).

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

16 records at the apex

Found

Read from
131.173.245.1:53
TypeValueTTL
SOAdns1.sonia.de. hostmaster.sonia.de. 2026100802 21600 2700 2419200 8640086400
NSdns-1.serv.uni-osnabrueck.de.86400
NSdns1.sonia.de.86400
NSdns2.sonia.de.86400
A141.41.9.103300
MX10 mx2.sonia.de.86400
MX10 mx1.sonia.de.86400
TXT"v=spf1 include:sonia.de ?all"86400
TXT"Foxit-domain-verification=e7a1d3ba0315b485a42574335ae98b48" ""86400
TXT"anthropic-domain-verification-kx8btg=hshGh55MQzunGHVJYk9rmAQo4"86400
TXT"HARICA-1L1aDSA6Sed4lOOTLmr"86400
TXT"autodesk-domain-verification=8JqB5bXEQT3oqLvabd5l"86400
TXT"4e73071a9209131a46dfc6e9e5669c93"86400
TXT"adobe-idp-site-verification=3382bf64b0d6f8d0bd06da0cede5fd6ca736667d19ecdecd797ba83679c0b1ca"86400
TXT"google-site-verification=bKIPP_FfXrBjH1W7LnzJjzP17Qeurb7L8t6asshImmc"86400
TXT"MS=ms28768235"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, 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