sellwerk.de

Checked 22 October 2026, 00:10 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-1401.awsdns-47.org, ns-1678.awsdns-17.co.uk, ns-743.awsdns-28.net, ns-89.awsdns-11.com

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns-1401.awsdns-47.org, ns-1678.awsdns-17.co.uk, ns-743.awsdns-28.net, ns-89.awsdns-11.com
NS in the zone
ns-1401.awsdns-47.org, ns-1678.awsdns-17.co.uk, ns-743.awsdns-28.net, ns-89.awsdns-11.com
NameserverAddressesNetwork (AS)Glue
ns-1401.awsdns-47.org205.251.197.121 2600:9000:5305:7900::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-1678.awsdns-17.co.uk205.251.198.142 2600:9000:5306:8e00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-743.awsdns-28.net205.251.194.231 2600:9000:5302:e700::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-89.awsdns-11.com205.251.192.89 2600:9000:5300:5900::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns-1401.awsdns-47.org, ns-1678.awsdns-17.co.uk, ns-743.awsdns-28.net, ns-89.awsdns-11.com.
  • ✓ 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-1401.awsdns-47.org 205.251.197.121NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns-1401.awsdns-47.org 2600:9000:5305:7900::1NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-1678.awsdns-17.co.uk 205.251.198.142NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-1678.awsdns-17.co.uk 2600:9000:5306:8e00::1NOERROR, 10 ms, authoritativenoyes / yesrefused-
ns-743.awsdns-28.net 205.251.194.231NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns-743.awsdns-28.net 2600:9000:5302:e700::1NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-89.awsdns-11.com 205.251.192.89NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-89.awsdns-11.com 2600:9000:5300:5900::1NOERROR, 9 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 2 · primary ns-743.awsdns-28.net

Found

Primary (MNAME)
ns-743.awsdns-28.net
Contact (RNAME)
awsdns-hostmaster.amazon.com
Serial
2
Refresh / retry
7200 s / 900 s
Expire
1209600 s
Negative TTL
900 s

Serial per nameserver

NameserverSerial
ns-1401.awsdns-47.org (205.251.197.121)2
ns-1401.awsdns-47.org (2600:9000:5305:7900::1)2
ns-1678.awsdns-17.co.uk (205.251.198.142)2
ns-1678.awsdns-17.co.uk (2600:9000:5306:8e00::1)2
ns-743.awsdns-28.net (205.251.194.231)2
ns-743.awsdns-28.net (2600:9000:5302:e700::1)2
ns-89.awsdns-11.com (205.251.192.89)2
ns-89.awsdns-11.com (2600:9000:5300:5900::1)2

Checks

  • ✓ Serial 2 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 2h, retry 15m, expire 14d, negative TTL 15m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns-743.awsdns-28.net 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 2 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

26 records at the apex

Found

Read from
205.251.197.121:53
TypeValueTTL
SOAns-743.awsdns-28.net. awsdns-hostmaster.amazon.com. 2 7200 900 1209600 900900
NSns-1401.awsdns-47.org.172800
NSns-1678.awsdns-17.co.uk.172800
NSns-743.awsdns-28.net.172800
NSns-89.awsdns-11.com.172800
A18.245.31.1060
A18.245.31.12660
A18.245.31.2760
A18.245.31.7160
MX10 mx01.hornetsecurity.com.1200
MX20 mx02.hornetsecurity.com.1200
MX30 mx03.hornetsecurity.com.1200
MX40 mx04.hornetsecurity.com.1200
TXT"Foxit-domain-verification=e3b3ef29b1ec896e7f962848aef9f3df"3600
TXT"ZOOM_verify_xmkC4DQQTe2TGJEuVYf-_Q"3600
TXT"anthropic-domain-verification-syny12=IA5DaHZxDP3UOHPiCX2GHZbdU"3600
TXT"apple-domain-verification=bfMdFhrqSOs1s9E7"3600
TXT"atlassian-domain-verification=hevVYnwW3mbI4DIpIwfHFu6qv3FSSqkqcRM6jZJ41FZe4ua6aRoj6ay7j4ge/337"3600
TXT"canva-site-verification=MWxOLRc22DDdvbqGI_Ti-g"3600
TXT"facebook-domain-verification=nneq6lywpmziglq90gbsqm7idzk276"3600
TXT"google-site-verification=Dkg6Pj1Ug2rNXUsDZnX7bvWotIXf2mHkSquP0p7Q3L0"3600
TXT"knowbe4-site-verification=0eaa82dfb90c711ba6318e8fd038375f"3600
TXT"mistral-domain-verification=e3296e329254c471f208bcf0c04af18c465a53c2"3600
TXT"openai-domain-verification=dv-p14oZ8tGidwhutpDAaV0Zvh1"3600
TXT"v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCrLHiExVd55zd/IQ/J/mRwSRMAocV/hMB3jXwaHH36d9NaVynQFYV8NaWi69c1veUtRzGt7yAioXqLj7Z4TeEUoOLgrKsn8YnckGs9i3B3tVFB+Ch/4mPhXWiNfNdynHWBcPcbJ8kjEQ2U8y78dHZj1YeRXXVvWob2OaKynO8/lQIDAQAB;"3600
TXT"v=spf1 redirect=sellwerk.de.spf.hornetdmarc.com"3600

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