mckinsey.de

Checked 21 October 2026, 23:21 UTC · via 8.8.8.8
!Passed with warnings
21 passed 3 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

a1-89.akam.net, a12-64.akam.net, a18-65.akam.net, a22-66.akam.net, a3-67.akam.net, a9-64.akam.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
a1-89.akam.net, a12-64.akam.net, a18-65.akam.net, a22-66.akam.net, a3-67.akam.net, a9-64.akam.net
NS in the zone
a1-89.akam.net, a12-64.akam.net, a18-65.akam.net, a22-66.akam.net, a3-67.akam.net, a9-64.akam.net
NameserverAddressesNetwork (AS)Glue
a1-89.akam.net193.108.91.89 2600:1401:2::59AS20940 AKAMAI-ASN1 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a12-64.akam.net184.26.160.64 2600:1480:f000::40AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a18-65.akam.net95.101.36.65 2600:1480:4800::41AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a22-66.akam.net23.211.61.66 2600:1480:7800::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a3-67.akam.net96.7.49.67 2600:1408:1c::43AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a9-64.akam.net184.85.248.64 2a02:26f0:117::40AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-

Checks

  • ✓ 6 nameservers #6
    Delegated to a1-89.akam.net, a12-64.akam.net, a18-65.akam.net, a22-66.akam.net, a3-67.akam.net, a9-64.akam.net.
  • ✓ 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 6 IPv4 /24s and 6 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS20940 (AKAMAI-ASN1 - Akamai International B.V., NL): 1 address; AS21342 (AKAMAI-ASN2 - Akamai International B.V., NL): 11 addresses.
  • i
    All nameserver names under .net
    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

warn

12 of 12 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
a1-89.akam.net 193.108.91.89NOERROR, 3 ms, authoritativenoyes / yesrefused41824.8
a1-89.akam.net 2600:1401:2::59NOERROR, 4 ms, authoritativenoyes / yesrefused41824.4
a12-64.akam.net 184.26.160.64NOERROR, 3 ms, authoritativenoyes / yesrefused48878.32
a12-64.akam.net 2600:1480:f000::40NOERROR, 4 ms, authoritativenoyes / yesrefused48878.27
a18-65.akam.net 95.101.36.65NOERROR, 3 ms, authoritativenoyes / yesrefused48878.29
a18-65.akam.net 2600:1480:4800::41NOERROR, 3 ms, authoritativenoyes / yesrefused48878.29
a22-66.akam.net 23.211.61.66NOERROR, 3 ms, authoritativenoyes / yesrefused48878.27
a22-66.akam.net 2600:1480:7800::42NOERROR, 4 ms, authoritativenoyes / yesrefused48878.26
a3-67.akam.net 96.7.49.67NOERROR, 3 ms, authoritativenoyes / yesrefused41824.4
a3-67.akam.net 2600:1408:1c::43NOERROR, 4 ms, authoritativenoyes / yesrefused41824.4
a9-64.akam.net 184.85.248.64NOERROR, 4 ms, authoritativenoyes / yesrefused41824.5
a9-64.akam.net 2a02:26f0:117::40NOERROR, 4 ms, authoritativenoyes / yesrefused41824.4

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: a1-89.akam.net: "41824.8"; a1-89.akam.net: "41824.4"; a12-64.akam.net: "48878.32"; a12-64.akam.net: "48878.27"; a18-65.akam.net: "48878.29"; a22-66.akam.net: "48878.27"; a22-66.akam.net: "48878.26"; a3-67.akam.net: "41824.4"; a9-64.akam.net: "41824.5"; a9-64.akam.net: "41824.4". 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

info

serial 2026091301 · primary ns2.mckinsey.com

Found

Primary (MNAME)
ns2.mckinsey.com
Contact (RNAME)
hostmaster.mckinsey.com
Serial
2026091301
Refresh / retry
28800 s / 7200 s
Expire
604800 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
a1-89.akam.net (193.108.91.89)2026091301
a1-89.akam.net (2600:1401:2::59)2026091301
a12-64.akam.net (184.26.160.64)2026091301
a12-64.akam.net (2600:1480:f000::40)2026091301
a18-65.akam.net (95.101.36.65)2026091301
a18-65.akam.net (2600:1480:4800::41)2026091301
a22-66.akam.net (23.211.61.66)2026091301
a22-66.akam.net (2600:1480:7800::42)2026091301
a3-67.akam.net (96.7.49.67)2026091301
a3-67.akam.net (2600:1408:1c::43)2026091301
a9-64.akam.net (184.85.248.64)2026091301
a9-64.akam.net (2a02:26f0:117::40)2026091301

Checks

  • ✓ Serial 2026091301 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 8h, retry 2h, expire 7d, negative TTL 5m.
  • i
    Hidden master
    The primary nameserver ns2.mckinsey.com is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.
    #24
  • ✓ Contact hostmaster@mckinsey.com #25
    The SOA RNAME hostmaster.mckinsey.com means hostmaster@mckinsey.com.
  • ✓ Date-based serial #26
    The serial 2026091301 follows the YYYYMMDDnn convention (2026-09-13).

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

warn

16 records at the apex

Found

Read from
193.108.91.89:53
TypeValueTTL
SOAns2.mckinsey.com. hostmaster.mckinsey.com. 2026091301 28800 7200 604800 300300
NSa22-66.akam.net.300
NSa1-89.akam.net.300
NSa12-64.akam.net.300
NSa3-67.akam.net.300
NSa9-64.akam.net.300
NSa18-65.akam.net.300
A2.16.204.14320
A2.16.204.15720
AAAA2a02:26f0:b700:3::210:cc8f20
AAAA2a02:26f0:b700:3::210:cc9d20
MX10 geo-mail.mckinsey.com.86400
TXT"_23scewf4sgv9r27v646qfti0i9mlorm"3600
TXT"facebook-domain-verification=6n85olznmu24emtrvdbv26x4xxxqdq"3600
TXT"bz13pxzsnkkk7dt46zcnvmp6y072j458"3600
TXT"v=spf1 ip4:217.69.91.133 ip4:93.187.113.108 ~all"3600

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (20s), AAAA (20s). Low TTLs are useful just before a planned change. The NS TTL at the parent is 1d and in the zone 5m; resolvers may use either.
    #32
  • ✓ 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