mpia.de

Checked 21 October 2026, 23:30 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, dns-3.dfn.de, dns1.belwue.de, dns1.gwdg.de, dns1.mpia-hd.mpg.de, dns2.gwdg.de, dns3.gwdg.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns-1.dfn.de, dns-3.dfn.de, dns1.belwue.de, dns1.gwdg.de, dns1.mpia-hd.mpg.de, dns2.gwdg.de, dns3.gwdg.de
NS in the zone
dns-1.dfn.de, dns-3.dfn.de, dns1.belwue.de, dns1.gwdg.de, dns1.mpia-hd.mpg.de, dns2.gwdg.de, dns3.gwdg.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-
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-
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
dns1.gwdg.de134.76.33.41 2a06:93c7:e1::1AS207592 GOENET - Gesellschaft fuer wissenschaftliche Datenverarbeitung mbH, Goettingen, DE AS207592 GOENET - Gesellschaft fuer wissenschaftliche Datenverarbeitung mbH, Goettingen, DE134.76.33.41 2a06:93c7:e1::1
dns1.mpia-hd.mpg.de149.217.71.134AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
dns2.gwdg.de134.76.33.42 2a06:93c7:e2::1AS207592 GOENET - Gesellschaft fuer wissenschaftliche Datenverarbeitung mbH, Goettingen, DE AS207592 GOENET - Gesellschaft fuer wissenschaftliche Datenverarbeitung mbH, Goettingen, DE134.76.33.42 2a06:93c7:e2::1
dns3.gwdg.de193.175.210.140AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE193.175.210.140

Checks

  • ✓ 7 nameservers #6
    Delegated to dns-1.dfn.de, dns-3.dfn.de, dns1.belwue.de, dns1.gwdg.de, dns1.mpia-hd.mpg.de, dns2.gwdg.de, dns3.gwdg.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 5 IPv4 /24s and 4 IPv6 /48s.
  • ✓ 3 autonomous systems #11
    The nameservers are spread over: AS207592 (GOENET - Gesellschaft fuer wissenschaftliche Datenverarbeitung mbH, Goettingen, DE): 4 addresses; AS553 (BELWUE - Universitaet Stuttgart, DE): 2 addresses; AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE): 6 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: dns1.mpia-hd.mpg.de, dns3.gwdg.de.
    #13

Nameservers

warn

12 of 12 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns-1.dfn.de 193.174.75.50NOERROR, 14 ms, authoritativenoyes / yesrefused0
dns-1.dfn.de 2001:638:d:b101::1NOERROR, 12 ms, authoritativenoyes / yesrefused0
dns-3.dfn.de 193.174.75.58NOERROR, 8 ms, authoritativenoyes / yesrefused0
dns-3.dfn.de 2001:638:d:b103::1NOERROR, 8 ms, authoritativenoyes / yesrefused0
dns1.belwue.de 129.143.2.10NOERROR, 9 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, 8 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)
dns1.gwdg.de 134.76.33.41NOERROR, 8 ms, authoritativenoyes / yesrefused-
dns1.gwdg.de 2a06:93c7:e1::1NOERROR, 8 ms, authoritativenoyes / yesrefused-
dns1.mpia-hd.mpg.de 149.217.71.134NOERROR, 5 ms, authoritativenoyes / yesrefused9.16.40
dns2.gwdg.de 134.76.33.42NOERROR, 7 ms, authoritativenoyes / yesrefused-
dns2.gwdg.de 2a06:93c7:e2::1NOERROR, 8 ms, authoritativenoyes / yesrefused-
dns3.gwdg.de 193.175.210.140NOERROR, 13 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 12 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)"; dns1.mpia-hd.mpg.de: "9.16.40". 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 2026072804 · primary dns1.mpia-hd.mpg.de

Found

Primary (MNAME)
dns1.mpia-hd.mpg.de
Contact (RNAME)
postmaster.mpia.de
Serial
2026072804
Refresh / retry
10800 s / 3600 s
Expire
1209600 s
Negative TTL
600 s

Serial per nameserver

NameserverSerial
dns-1.dfn.de (193.174.75.50)2026072804
dns-1.dfn.de (2001:638:d:b101::1)2026072804
dns-3.dfn.de (193.174.75.58)2026072804
dns-3.dfn.de (2001:638:d:b103::1)2026072804
dns1.belwue.de (129.143.2.10)2026072804
dns1.belwue.de (2001:7c0::53:10)2026072804
dns1.gwdg.de (134.76.33.41)2026072804
dns1.gwdg.de (2a06:93c7:e1::1)2026072804
dns1.mpia-hd.mpg.de (149.217.71.134)2026072804
dns2.gwdg.de (134.76.33.42)2026072804
dns2.gwdg.de (2a06:93c7:e2::1)2026072804
dns3.gwdg.de (193.175.210.140)2026072804

Checks

  • ✓ Serial 2026072804 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 14d, negative TTL 10m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver dns1.mpia-hd.mpg.de is one of the listed nameservers.
  • ✓ Contact postmaster@mpia.de #25
    The SOA RNAME postmaster.mpia.de means postmaster@mpia.de.
  • ✓ Date-based serial #26
    The serial 2026072804 follows the YYYYMMDDnn convention (2026-07-28).

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

18 records at the apex

Found

Read from
193.174.75.50:53
TypeValueTTL
SOAdns1.mpia-hd.mpg.de. postmaster.mpia.de. 2026072804 10800 3600 1209600 60010800
NSdns1.belwue.de.10800
NSdns2.gwdg.de.10800
NSdns1.gwdg.de.10800
NSdns1.mpia-hd.mpg.de.10800
NSdns-3.dfn.de.10800
NSdns-1.dfn.de.10800
NSdns3.gwdg.de.10800
A134.76.31.20510800
MX10 c1234.mx.srv.dfn.de.10800
MX10 b1234.mx.srv.dfn.de.10800
MX10 a1234.mx.srv.dfn.de.10800
TXT"MS=ms81784380"10800
TXT"HARICA-WMUqEGVMAyKbQEaum1U"10800
TXT"cisco-ci-domain-verification=6e3e28757df1667f214563833efd5da6529ab25af54749d93c525dff4c3442e5"10800
TXT"google-site-verification=yPANFn42nGK-FKp961e8qCw3VT6DAqAL9KzGH0AphHw"10800
TXT"apple-domain-verification=1borqPMEaf8RyqUB"10800
TXT"v=spf1 a mx ip4:149.217.71.6 ip4:149.217.71.135 ip4:149.217.70.16 include:spf.crsend.com include:spf.customer.inriva.com include:spf.gwdg.de include:spf.de.umantis.com ~all"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.
  • 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