albert-schweitzer-stiftung.de

Checked 21 October 2026, 21:28 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-1456.awsdns-54.org, ns-2016.awsdns-60.co.uk, ns-290.awsdns-36.com, ns-823.awsdns-38.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns-1456.awsdns-54.org, ns-2016.awsdns-60.co.uk, ns-290.awsdns-36.com, ns-823.awsdns-38.net
NS in the zone
ns-1456.awsdns-54.org, ns-2016.awsdns-60.co.uk, ns-290.awsdns-36.com, ns-823.awsdns-38.net
NameserverAddressesNetwork (AS)Glue
ns-1456.awsdns-54.org205.251.197.176 2600:9000:5305:b000::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-2016.awsdns-60.co.uk205.251.199.224 2600:9000:5307:e000::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-290.awsdns-36.com205.251.193.34 2600:9000:5301:2200::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-823.awsdns-38.net205.251.195.55 2600:9000:5303:3700::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns-1456.awsdns-54.org, ns-2016.awsdns-60.co.uk, ns-290.awsdns-36.com, ns-823.awsdns-38.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-1456.awsdns-54.org 205.251.197.176NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns-1456.awsdns-54.org 2600:9000:5305:b000::1NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-2016.awsdns-60.co.uk 205.251.199.224NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-2016.awsdns-60.co.uk 2600:9000:5307:e000::1NOERROR, 10 ms, authoritativenoyes / yesrefused-
ns-290.awsdns-36.com 205.251.193.34NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-290.awsdns-36.com 2600:9000:5301:2200::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-823.awsdns-38.net 205.251.195.55NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns-823.awsdns-38.net 2600:9000:5303:3700::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-290.awsdns-36.com

Found

Primary (MNAME)
ns-290.awsdns-36.com
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-1456.awsdns-54.org (205.251.197.176)1
ns-1456.awsdns-54.org (2600:9000:5305:b000::1)1
ns-2016.awsdns-60.co.uk (205.251.199.224)1
ns-2016.awsdns-60.co.uk (2600:9000:5307:e000::1)1
ns-290.awsdns-36.com (205.251.193.34)1
ns-290.awsdns-36.com (2600:9000:5301:2200::1)1
ns-823.awsdns-38.net (205.251.195.55)1
ns-823.awsdns-38.net (2600:9000:5303:3700::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-290.awsdns-36.com 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

24 records at the apex

Found

Read from
205.251.197.176:53
TypeValueTTL
SOAns-290.awsdns-36.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400900
NSns-1456.awsdns-54.org.172800
NSns-2016.awsdns-60.co.uk.172800
NSns-290.awsdns-36.com.172800
NSns-823.awsdns-38.net.172800
A63.34.172.13260
A46.137.122.15360
A3.248.76.12860
MX1 aspmx.l.google.com.3600
MX10 aspmx2.googlemail.com.3600
MX10 aspmx3.googlemail.com.3600
MX5 alt1.aspmx.l.google.com.3600
MX5 alt2.aspmx.l.google.com.3600
TXT"MS=F8A5D72C56C708BE2B63B0E253B9A1166E7EA030"300
TXT"MS=ms98617607"300
TXT"anthropic-domain-verification-akr2f2=oB42J5wSC0OIpCfbzclqLDCPD"300
TXT"apple-domain-verification=wPv3QwS2tXIDR21K"300
TXT"atlassian-domain-verification=Pzg6sPpv4XILCSliItluLXuHAL6aMKFkU5iMj98NK/StyMyk15E2Ysram158mkBl"300
TXT"detectify-verification=43cd65cb3fa3f8091e4b94e97db63671"300
TXT"facebook-domain-verification=yopz1nq1ytge6w73706c1e8l1zg6iy"300
TXT"google-site-verification=7SmgaKHGtOVIvW8tC4aoP3_FYeBmuqlAToyLT0GvTww"300
TXT"google-site-verification=dCefd4R5vZ3uzgO2W87_jAF3UF9BxrcV2Jp0yYWG-Hg"300
TXT"linkedin-site-verification=66c4c3aa-dc5b-4c43-b6f8-2045f7aafe77"300
TXT"v=spf1 include:spf.mailjet.com include:spf.komfortkasse.eu include:_spf.google.com include:spf.crsend.com include:_spf.zimpel.de ~all"300

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