cornelsen.de

Checked 21 October 2026, 22:11 UTC · via 8.8.8.8
!Passed with warnings
23 passed 2 warnings 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

ns-1277.awsdns-31.org, ns-1757.awsdns-27.co.uk, ns-264.awsdns-33.com, ns-771.awsdns-32.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns-1277.awsdns-31.org, ns-1757.awsdns-27.co.uk, ns-264.awsdns-33.com, ns-771.awsdns-32.net
NS in the zone
ns-1277.awsdns-31.org, ns-1757.awsdns-27.co.uk, ns-264.awsdns-33.com, ns-771.awsdns-32.net
NameserverAddressesNetwork (AS)Glue
ns-1277.awsdns-31.org205.251.196.253 2600:9000:5304:fd00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-1757.awsdns-27.co.uk205.251.198.221 2600:9000:5306:dd00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-264.awsdns-33.com205.251.193.8 2600:9000:5301:800::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-771.awsdns-32.net205.251.195.3 2600:9000:5303:300::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns-1277.awsdns-31.org, ns-1757.awsdns-27.co.uk, ns-264.awsdns-33.com, ns-771.awsdns-32.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 4 IPv4 /24s and 4 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS16509 (AMAZON-02 - Amazon.com, Inc., US): 8 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.
    #11
  • ✓ Nameserver names under 4 TLDs #12
    Nameserver names use the TLDs .com, .net, .org, .uk.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

pass

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns-1277.awsdns-31.org 205.251.196.253NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns-1277.awsdns-31.org 2600:9000:5304:fd00::1NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-1757.awsdns-27.co.uk 205.251.198.221NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-1757.awsdns-27.co.uk 2600:9000:5306:dd00::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-264.awsdns-33.com 205.251.193.8NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-264.awsdns-33.com 2600:9000:5301:800::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-771.awsdns-32.net 205.251.195.3NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-771.awsdns-32.net 2600:9000:5303:300::1NOERROR, 4 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 8 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 1 · primary ns-1277.awsdns-31.org

Found

Primary (MNAME)
ns-1277.awsdns-31.org
Contact (RNAME)
awsdns-hostmaster.amazon.com
Serial
1
Refresh / retry
7200 s / 900 s
Expire
1209600 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns-1277.awsdns-31.org (205.251.196.253)1
ns-1277.awsdns-31.org (2600:9000:5304:fd00::1)1
ns-1757.awsdns-27.co.uk (205.251.198.221)1
ns-1757.awsdns-27.co.uk (2600:9000:5306:dd00::1)1
ns-264.awsdns-33.com (205.251.193.8)1
ns-264.awsdns-33.com (2600:9000:5301:800::1)1
ns-771.awsdns-32.net (205.251.195.3)1
ns-771.awsdns-32.net (2600:9000:5303:300::1)1

Checks

  • ✓ Serial 1 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 2h, retry 15m, expire 14d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns-1277.awsdns-31.org is one of the listed nameservers.
  • ✓ Contact awsdns-hostmaster@amazon.com #25
    The SOA RNAME awsdns-hostmaster.amazon.com means awsdns-hostmaster@amazon.com.
  • ✓ Counter serial #26
    The serial 1 is a plain counter.

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

32 records at the apex

Found

Read from
205.251.196.253:53
TypeValueTTL
SOAns-1277.awsdns-31.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 8640060
NSns-1277.awsdns-31.org.172800
NSns-1757.awsdns-27.co.uk.172800
NSns-264.awsdns-33.com.172800
NSns-771.awsdns-32.net.172800
A63.186.109.13360
A52.29.228.20960
A63.176.156.11160
MX0 cornelsen-de.mail.protection.outlook.com.300
TXT"MS=ms38972756"60
TXT"Nfp2DdukBLyMwZ1MZSQATjRw6Ajr94CXzmd1LsNJqVAVaSGPxpvlZka2OtwCOlMxAG66SNxUzsAy3+h5gJ/N9g=="60
TXT"WUnqPK33toxdXOu3xyB3X09vypLHEVEJbmi7VwL2tux5VAK2IzqV2DoBVYT+gjABWZbwQOAHvlnvPKPwO9rSbA=="60
TXT"adobe-idp-site-verification=075eefcd8c33f186361df81cd071b736d6ad72a67e45403e81a51e1abc127a35"60
TXT"amazon-business-verification=f4168904c8be60d1d4877d9ff159908bd25425a8c06daa228a6982d8da6d0194"60
TXT"anthropic-domain-verification-brned8=6fIqJJT4lj6uSCr6vBxAas5mb"60
TXT"apple-domain-verification=xGReqLiL3uORi91J"60
TXT"atlassian-domain-verification=UKhaASuiBgHSP1HFyGFpCg97gxAB3ajCWeNoCi9UhFezOaeLQdoEusxD40HaIWDw"60
TXT"atlassian-sending-domain-verification=ca8d00ff-d08e-4ab7-a729-19a6778e2f9c"60
TXT"cursor-domain-verification-t6wq93=Y4lzs5nNc1kXGVbMsSCgZZlmP"60
TXT"docker-verification=8eaf80ae-69fb-4bf3-990b-ca7f91b5d3ba"60
TXT"elevenlabs=WI20cXefWxZmhjDt-G4BT0pJ0XV5b5MLRLHKFEd_Bgw"60
TXT"extensis-domain-verification=226bf594-c323-4667-ad13-73afbf8a47ad"60
TXT"extensis-domain-verification=d39c624e-715d-4d88-be9a-63bf49dc2697"60
TXT"figma-domain-verification=78640750bb0cfa14d7920dce6c3b79347f6fb7ae97a3d1b017e990ca2230b1f6-1773731634"60
TXT"google-site-verification=2Q9tZz5nHSWE65oB8Uve9P-ji_oyafecp2Dr600-Zpk"60
TXT"google-site-verification=aqFKhBTmzR4NFf7pxWpKJ7kpT3WXU9TI-J41Ggr-UXg"60
TXT"google-site-verification=rBaY0LQ0GsZP8eVbJMUNXLzhJsJZ7_BoKIVNoqBYUrc"60
TXT"infoblox-domain-mastery=1f1e1b6c6cd0b91a64b41d81e1c259bad01d8ef277b2d2b00df443084e110f2cb6"60
TXT"jamf-site-verification=jhRf0g6Yo6ij6f9HrS8mtg"60
TXT"mindmanager-verification=b9efeea84fa602423d14f9bac7387c9ae2b0378134268885e3129f5cd7ccd2c0"60
TXT"miro-verification=df094973366a264bb093ee50ef9bc221d85d515c"60
TXT"v=spf1 ip4:194.39.190.120 ip4:194.39.190.127 ip4:194.39.189.0/24 include:spf.protection.outlook.com include:spfa.cornelsen.de include:spf.hornetsecurity.com include:_spf.rexx-suite.com include:_spf.qp-mail.eu include:_spf.tivian.com ~all"60

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (1m). Low TTLs are useful just before a planned change. The NS TTL at the parent is 1d and in the zone 2d; 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