dagstuhl.de

Checked 21 October 2026, 22:11 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

dns1.belwue.de, ernst.dagstuhl.de, ns.dagstuhl.de, ns.uni-saarland.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns1.belwue.de, ernst.dagstuhl.de, ns.dagstuhl.de, ns.uni-saarland.de
NS in the zone
dns1.belwue.de, ernst.dagstuhl.de, ns.dagstuhl.de, ns.uni-saarland.de
NameserverAddressesNetwork (AS)Glue
dns1.belwue.de129.143.2.10 2001:7c0::53:10AS553 BELWUE - Universitaet Stuttgart, DE AS553 BELWUE - Universitaet Stuttgart, DE129.143.2.10 2001:7c0::53:10
ernst.dagstuhl.de192.76.146.35AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE192.76.146.35
ns.dagstuhl.de192.76.146.1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE192.76.146.1
ns.uni-saarland.de134.96.7.7AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-

Checks

  • ✓ 4 nameservers #6
    Delegated to dns1.belwue.de, ernst.dagstuhl.de, ns.dagstuhl.de, ns.uni-saarland.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: ernst.dagstuhl.de, ns.dagstuhl.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 3 IPv4 /24s and 1 IPv6 /48.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS553 (BELWUE - Universitaet Stuttgart, DE): 2 addresses; AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE): 3 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: ernst.dagstuhl.de, ns.dagstuhl.de, ns.uni-saarland.de.
    #13

Nameservers

warn

5 of 5 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns1.belwue.de 129.143.2.10NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)
dns1.belwue.de 2001:7c0::53:10NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)
ernst.dagstuhl.de 192.76.146.35NOERROR, 14 ms, authoritativenoyes / yesrefused-
ns.dagstuhl.de 192.76.146.1NOERROR, 14 ms, authoritativenoyes / yesrefused-
ns.uni-saarland.de 134.96.7.7NOERROR, 9 ms, authoritativenoyes / yesrefused0

Checks

  • ✓ All respond #14
    All 5 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: dns1.belwue.de: "PowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)". 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 2026091604 · primary ns.dagstuhl.de

Found

Primary (MNAME)
ns.dagstuhl.de
Contact (RNAME)
net.dagstuhl.de
Serial
2026091604
Refresh / retry
3600 s / 600 s
Expire
1209600 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
dns1.belwue.de (129.143.2.10)2026091604
dns1.belwue.de (2001:7c0::53:10)2026091604
ernst.dagstuhl.de (192.76.146.35)2026091604
ns.dagstuhl.de (192.76.146.1)2026091604
ns.uni-saarland.de (134.96.7.7)2026091604

Checks

  • ✓ Serial 2026091604 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1h, retry 10m, expire 14d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns.dagstuhl.de is one of the listed nameservers.
  • ✓ Contact net@dagstuhl.de #25
    The SOA RNAME net.dagstuhl.de means net@dagstuhl.de.
  • ✓ Date-based serial #26
    The serial 2026091604 follows the YYYYMMDDnn convention (2026-09-16).

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

11 records at the apex

Found

Read from
129.143.2.10:53
TypeValueTTL
SOAns.dagstuhl.de. net.dagstuhl.de. 2026091604 3600 600 1209600 3600600
NSdns1.belwue.de.600
NSns.dagstuhl.de.600
NSernst.dagstuhl.de.600
NSns.uni-saarland.de.600
A192.76.146.114600
MX10 b2761.mx.srv.dfn.de.600
MX10 c2761.mx.srv.dfn.de.600
MX10 a2761.mx.srv.dfn.de.600
TXT"google-site-verification=8RhBYLkLekYzw3OLqgPcL0H8dP5Bm51ibbUSZK5Vhiw"600
TXT"v=spf1 ip4:192.76.146.9 -all"600

Checks

  • ✓ TTLs within range #32
    TTLs: A 10m, MX 10m, NS 10m. The NS TTL at the parent is 1d and in the zone 10m; 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