barmer.de

Checked 21 October 2026, 21:35 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-1101.awsdns-09.org, ns-184.awsdns-23.com, ns-1845.awsdns-38.co.uk, ns-605.awsdns-11.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns-1101.awsdns-09.org, ns-184.awsdns-23.com, ns-1845.awsdns-38.co.uk, ns-605.awsdns-11.net
NS in the zone
ns-1101.awsdns-09.org, ns-184.awsdns-23.com, ns-1845.awsdns-38.co.uk, ns-605.awsdns-11.net
NameserverAddressesNetwork (AS)Glue
ns-1101.awsdns-09.org205.251.196.77 2600:9000:5304:4d00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-184.awsdns-23.com205.251.192.184 2600:9000:5300:b800::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-1845.awsdns-38.co.uk205.251.199.53 2600:9000:5307:3500::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-605.awsdns-11.net205.251.194.93 2600:9000:5302:5d00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns-1101.awsdns-09.org, ns-184.awsdns-23.com, ns-1845.awsdns-38.co.uk, ns-605.awsdns-11.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-1101.awsdns-09.org 205.251.196.77NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-1101.awsdns-09.org 2600:9000:5304:4d00::1NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-184.awsdns-23.com 205.251.192.184NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-184.awsdns-23.com 2600:9000:5300:b800::1NOERROR, 10 ms, authoritativenoyes / yesrefused-
ns-1845.awsdns-38.co.uk 205.251.199.53NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-1845.awsdns-38.co.uk 2600:9000:5307:3500::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-605.awsdns-11.net 205.251.194.93NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-605.awsdns-11.net 2600:9000:5302:5d00::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-1845.awsdns-38.co.uk

Found

Primary (MNAME)
ns-1845.awsdns-38.co.uk
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-1101.awsdns-09.org (205.251.196.77)1
ns-1101.awsdns-09.org (2600:9000:5304:4d00::1)1
ns-184.awsdns-23.com (205.251.192.184)1
ns-184.awsdns-23.com (2600:9000:5300:b800::1)1
ns-1845.awsdns-38.co.uk (205.251.199.53)1
ns-1845.awsdns-38.co.uk (2600:9000:5307:3500::1)1
ns-605.awsdns-11.net (205.251.194.93)1
ns-605.awsdns-11.net (2600:9000:5302:5d00::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-1845.awsdns-38.co.uk 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

19 records at the apex

Found

Read from
205.251.196.77:53
TypeValueTTL
SOAns-1845.awsdns-38.co.uk. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400900
NSns-1101.awsdns-09.org.172800
NSns-184.awsdns-23.com.172800
NSns-1845.awsdns-38.co.uk.172800
NSns-605.awsdns-11.net.172800
A63.182.109.10960
A3.68.131.20660
A63.178.210.1260
MX10 issbh-smtp01.mas.t-systems-service.com.30
MX10 issbh-smtp02.mas.t-systems-service.com.30
TXT"MS=ms64520212"30
TXT"_mvn7vpfh0wegy8pwv7g55k12i313lbs"30
TXT"apple-domain-verification=B2fOv2kB-FKm2YVJZUkbPghOYublp4AanGYMEpbmGno"30
TXT"atlassian-domain-verification=J9uNvg/fjm0hy2yTH/6phc3f2ZrH2MqptW3zd7ZR9i97fttZaoqcjFo4XECrXOEz"30
TXT"cisco-ci-domain-verification=64039612262e2452a4855834574e283f74eb20662a153cba4b62ace2455be584"30
TXT"facebook-domain-verification=u5pap3v2rrz6h5iumkw8phkymrvi51"30
TXT"google-site-verification=H59eImjnWbWyzB3xkPtKwsHj903XC7ZHwYXhWvm0JL0"30
TXT"successfactors-site-verification=MzA2YzZkMTAxYzE3OTQ4ZmYzMmQyZjI0NTllNDk0NjRmZDMwY2Y0MDA5ODBiNWIwODFmNjNiMTg4YjZkYzU1Mg=="30
TXT"v=spf1 mx a:spf-issbh.mas.t-systems-service.com a:smtp.bitsystems-gmbh.de ip4:185.172.11.154 ip4:35.242.247.107 ip4:34.107.8.58 ip4:62.146.198.45 include:_spf-dc55.sapsf.eu include:spf.protection.outlook.com -all"30

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (1m), MX (30s). 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