aerzteblatt.de

Checked 21 October 2026, 21:28 UTC · via 8.8.8.8
!Passed with warnings
21 passed 1 warning 0 failed 7 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

ns19.domaincontrol.com, ns20.domaincontrol.com

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns19.domaincontrol.com, ns20.domaincontrol.com
NS in the zone
ns19.domaincontrol.com, ns20.domaincontrol.com
NameserverAddressesNetwork (AS)Glue
ns19.domaincontrol.com97.74.109.10 2603:5:21d0::aAS44273 GODADDY-DNS - Host Europe GmbH, DE AS44273 GODADDY-DNS - Host Europe GmbH, DE-
ns20.domaincontrol.com173.201.77.10 2603:5:22d0::aAS44273 GODADDY-DNS - Host Europe GmbH, DE AS44273 GODADDY-DNS - Host Europe GmbH, DE-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns19.domaincontrol.com, ns20.domaincontrol.com.
    #6
  • ✓ 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 2 IPv4 /24s and 2 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS44273 (GODADDY-DNS - Host Europe GmbH, DE): 4 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 .com
    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

pass

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns19.domaincontrol.com 97.74.109.10NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns19.domaincontrol.com 2603:5:21d0::aNOERROR, 3 ms, authoritativenoyes / yesrefused-
ns20.domaincontrol.com 173.201.77.10NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns20.domaincontrol.com 2603:5:22d0::aNOERROR, 4 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 4 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 2026102101 · primary ns19.domaincontrol.com

Found

Primary (MNAME)
ns19.domaincontrol.com
Contact (RNAME)
dns.jomax.net
Serial
2026102101
Refresh / retry
28800 s / 7200 s
Expire
604800 s
Negative TTL
600 s

Serial per nameserver

NameserverSerial
ns19.domaincontrol.com (97.74.109.10)2026102101
ns19.domaincontrol.com (2603:5:21d0::a)2026102101
ns20.domaincontrol.com (173.201.77.10)2026102101
ns20.domaincontrol.com (2603:5:22d0::a)2026102101

Checks

  • ✓ Serial 2026102101 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 8h, retry 2h, expire 7d, negative TTL 10m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns19.domaincontrol.com is one of the listed nameservers.
  • ✓ Contact dns@jomax.net #25
    The SOA RNAME dns.jomax.net means dns@jomax.net.
  • ✓ Date-based serial #26
    The serial 2026102101 follows the YYYYMMDDnn convention (2026-10-21).

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

19 records at the apex

Found

Read from
97.74.109.10:53
TypeValueTTL
SOAns19.domaincontrol.com. dns.jomax.net. 2026102101 28800 7200 604800 6003600
NSns20.domaincontrol.com.3600
NSns19.domaincontrol.com.3600
A35.157.125.147600
MX40 nsp-mail-gw.westeurope.cloudapp.azure.com.600
MX50 dst.aerzteverlag-it.de.600
MX100 mailgw.aerzteverlag.de.600
TXT"google-site-verification=ILqC8ooiEZAteibaNBuL9V8gzTYNWAGFijWzQT-_leo"600
TXT"apple-domain-verification=f900d6MfIz7vz0Tz"600
TXT"xj5+7RCjmD+JYIVKV+QT2bxc7iOjJ1P1AuOzaksINhzw0YhM5FAZB74uxwjbByz1Z0x9IMOmbaA47xZYmhUdaA=="600
TXT"v=spf1 a mx include:spf.crsend.com include:dst.aerzteverlag-it.de ip4:35.157.125.147 include:spf.mandrillapp.com include:25230758.spf01.hubspotemail.net include:spf.protection.outlook.com include:spf.mailjet.com ~all"600
TXT"google-site-verification=SJXiPfokWeDhoE8frm299EH7NPFj5bFq2MTrX2fq_sc"600
TXT"knowbe4-site-verification=a21332cab4d90dc62dcf2be69dd5a190"600
TXT"3D34-QLF3-48XA-6DF9"600
TXT"swisssign-check=stW93mkg1dA6xAk72Kvp6PjSJu8"600
TXT"swisssign-check=SzkjvPoHDmw0GOQXlugNmtkTsyA"600
TXT"swisssign-check=tuhPINXmnrcytEXxmjcQgMEOstc"600
TXT"cisco-ci-domain-verification=394684166bc4d58d0f84216b2aeef9bfc5bcacbbcf90a8b81573d4c28d9aadff"600
TXT"swisssign-check=78sRDyID0jv43AVgF6JObBNQEew"600

Checks

  • ✓ TTLs within range #32
    TTLs: A 10m, MX 10m, NS 1h. The NS TTL at the parent is 1d and in the zone 1h; resolvers may use either.
  • ✓ No CNAME at the apex #33
    The zone apex has no CNAME record.
  • i
    Wildcard record
    A random name under the zone resolves, so there is a wildcard (*) record. Typos and non-existent hosts resolve too, which can confuse mail and certificate checks.
    #34
  • 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