mpil.de

Checked 21 October 2026, 23:30 UTC · via 8.8.8.8
✗Problems found
21 passed 2 warnings 1 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

warn

ns1.mpil.de, ns3.mpil.de, ns5.mpil.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns1.mpil.de, ns3.mpil.de, ns5.mpil.de
NS in the zone
ns1.mpil.de, ns3.mpil.de, ns5.mpil.de
NameserverAddressesNetwork (AS)Glue
ns1.mpil.de149.217.72.51AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE149.217.72.51
ns3.mpil.de149.217.72.49AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE149.217.72.49
ns5.mpil.de193.175.211.2AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE193.175.211.2

Checks

  • ✓ 3 nameservers #6
    Delegated to ns1.mpil.de, ns3.mpil.de, ns5.mpil.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: ns1.mpil.de, ns3.mpil.de, ns5.mpil.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 2 IPv4 /24s and 0 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): 3 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
  • !
    No IPv6
    None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.
    #13

Nameservers

fail

3 of 3 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.mpil.de 149.217.72.51NOERROR, 6 ms, authoritativenono / yesrefused-
ns3.mpil.de 149.217.72.49NOERROR, 6 ms, authoritativenono / yesrefused-
ns5.mpil.de 193.175.211.2NOERROR, 12 ms, authoritativenono / yesrefused-

Checks

  • ✓ All respond #14
    All 3 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.
  • ✗
    No DNS over TCP
    DNS over TCP is required (RFC 7766); without it, large answers such as DNSSEC responses fail. Not answering over TCP: ns1.mpil.de (149.217.72.51): dial tcp 149.217.72.51:53: i/o timeout; ns3.mpil.de (149.217.72.49): dial tcp 149.217.72.49:53: i/o timeout; ns5.mpil.de (193.175.211.2): dial tcp 193.175.211.2:53: i/o timeout.
    #19
  • ✓ EDNS supported #20
    All nameservers support EDNS(0).
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

pass

serial 2026081802 · primary ns1.mpil.de

Found

Primary (MNAME)
ns1.mpil.de
Contact (RNAME)
edv.mpil.de
Serial
2026081802
Refresh / retry
10800 s / 3600 s
Expire
1209600 s
Negative TTL
600 s

Serial per nameserver

NameserverSerial
ns1.mpil.de (149.217.72.51)2026081802
ns3.mpil.de (149.217.72.49)2026081802
ns5.mpil.de (193.175.211.2)2026081802

Checks

  • ✓ Serial 2026081802 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 ns1.mpil.de is one of the listed nameservers.
  • ✓ Contact edv@mpil.de #25
    The SOA RNAME edv.mpil.de means edv@mpil.de.
  • ✓ Date-based serial #26
    The serial 2026081802 follows the YYYYMMDDnn convention (2026-08-18).

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

10 records at the apex

Found

Read from
149.217.72.51:53
TypeValueTTL
SOAns1.mpil.de. edv.mpil.de. 2026081802 10800 3600 1209600 60086400
NSns5.mpil.de.86400
NSns3.mpil.de.86400
NSns1.mpil.de.86400
MX10 mx2.mpil.de.86400
MX10 mx1.mpil.de.86400
TXT"v=spf1 mx:mpil.de ip4:149.217.72.1 ~all"3600
TXT"google-site-verification=OaImBCCF47bqW0Q73UzJ2zOg-1GaOjbihf1if0e5te0"3600
TXT"adobe-idp-site-verification=66050bbf4f0c8b62c23072dd63dcdb7c86d630eca47d76e1b7f9def23f3ae0fc"3600
TXT"cisco-ci-domain-verification=7e127f2a8dcd3d609ac9ccf90585535dca6be4206f4e693b8530d202b6a1020b"3600

Checks

  • ✓ TTLs within range #32
    TTLs: 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