mpic.de

Checked 21 October 2026, 23:30 UTC · via 8.8.8.8
!Passed with warnings
24 passed 1 warning 0 failed 4 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.gwdg.de, dns2.gwdg.de, dns3.gwdg.de, ns0.mpic.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns1.gwdg.de, dns2.gwdg.de, dns3.gwdg.de, ns0.mpic.de
NS in the zone
dns1.gwdg.de, dns2.gwdg.de, dns3.gwdg.de, ns0.mpic.de
NameserverAddressesNetwork (AS)Glue
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
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
ns0.mpic.de192.67.218.167AS2857 RLP-NET - Johannes Gutenberg-Universitaet Mainz, DE192.67.218.167

Checks

  • ✓ 4 nameservers #6
    Delegated to dns1.gwdg.de, dns2.gwdg.de, dns3.gwdg.de, ns0.mpic.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: ns0.mpic.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 2 IPv6 /48s.
  • ✓ 3 autonomous systems #11
    The nameservers are spread over: AS207592 (GOENET - Gesellschaft fuer wissenschaftliche Datenverarbeitung mbH, Goettingen, DE): 4 addresses; AS2857 (RLP-NET - Johannes Gutenberg-Universitaet Mainz, DE): 1 address; AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE): 1 address.
  • 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: dns3.gwdg.de, ns0.mpic.de.
    #13

Nameservers

pass

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns1.gwdg.de 134.76.33.41NOERROR, 8 ms, authoritativenoyes / yesrefused-
dns1.gwdg.de 2a06:93c7:e1::1NOERROR, 7 ms, authoritativenoyes / yesrefused-
dns2.gwdg.de 134.76.33.42NOERROR, 8 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-
ns0.mpic.de 192.67.218.167NOERROR, 4 ms, authoritativenoyes / yesrefused-

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.
  • ✓ No version disclosed #17
    The nameservers don't reveal their software version.
  • ✓ 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 2026082403 · primary ns0.mpic.de

Found

Primary (MNAME)
ns0.mpic.de
Contact (RNAME)
it.mpic.de
Serial
2026082403
Refresh / retry
14400 s / 3600 s
Expire
1209600 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
dns1.gwdg.de (134.76.33.41)2026082403
dns1.gwdg.de (2a06:93c7:e1::1)2026082403
dns2.gwdg.de (134.76.33.42)2026082403
dns2.gwdg.de (2a06:93c7:e2::1)2026082403
dns3.gwdg.de (193.175.210.140)2026082403
ns0.mpic.de (192.67.218.167)2026082403

Checks

  • ✓ Serial 2026082403 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 4h, retry 1h, expire 14d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns0.mpic.de is one of the listed nameservers.
  • ✓ Contact it@mpic.de #25
    The SOA RNAME it.mpic.de means it@mpic.de.
  • ✓ Date-based serial #26
    The serial 2026082403 follows the YYYYMMDDnn convention (2026-08-24).

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

pass

22 records at the apex

Found

Read from
134.76.33.41:53
TypeValueTTL
SOAns0.mpic.de. it.mpic.de. 2026082403 14400 3600 1209600 8640086400
NSdns2.gwdg.de.86400
NSdns3.gwdg.de.86400
NSns0.mpic.de.86400
NSdns1.gwdg.de.86400
A134.76.31.20586400
MX10 mail.mpic.de.86400
TXT"v=spf1 mx include:spf.gwdg.de -all"3600
TXT"mistral-domain-verification=f1da0610fbc02c0d1c394b8058fe77cebd3cb733"3600
TXT"MS=ms60046947"3600
TXT"cisco-ci-domain-verification=672a263bb0fb4fba42dc76e19fada5dace6b00544bc52e36055a8ac5db1692d8"3600
TXT"adobe-idp-site-verification=85ccdc5eedcea3d2bc75d2752fbbf51cb6e651683df1e839ffb7691b85749423"3600
TXT"HARICA-L5XWjduAEYXBG2LQ6F3"3600
TXT"anthropic-domain-verification-x9gap6=oa4MHiJit40ZaJb8ZXKowHtV0"3600
TXT"apple-domain-verification=LW45y1oSMNFMWJaF"3600
CAA0 issue "letsencrypt.org"86400
CAA0 issue "sectigo.com"86400
CAA0 iodef "mailto:hostmaster@mpic.de"86400
CAA0 issue "harica.gr"86400
CAA0 issue "pki.dfn.de"86400
CAA0 issuewild "harica.gr"86400
CAA0 issuewild ";"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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: letsencrypt.org, sectigo.com, harica.gr, pki.dfn.de, none (issuance forbidden).