dfb.de

Checked 21 October 2026, 22:13 UTC · via 8.8.8.8
iAll checks passed
28 passed 0 warnings 0 failed 5 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-1256.awsdns-29.org, ns-1561.awsdns-03.co.uk, ns-29.awsdns-03.com, ns-831.awsdns-39.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns-1256.awsdns-29.org, ns-1561.awsdns-03.co.uk, ns-29.awsdns-03.com, ns-831.awsdns-39.net
NS in the zone
ns-1256.awsdns-29.org, ns-1561.awsdns-03.co.uk, ns-29.awsdns-03.com, ns-831.awsdns-39.net
NameserverAddressesNetwork (AS)Glue
ns-1256.awsdns-29.org205.251.196.232 2600:9000:5304:e800::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-1561.awsdns-03.co.uk205.251.198.25 2600:9000:5306:1900::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-29.awsdns-03.com205.251.192.29 2600:9000:5300:1d00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-831.awsdns-39.net205.251.195.63 2600:9000:5303:3f00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns-1256.awsdns-29.org, ns-1561.awsdns-03.co.uk, ns-29.awsdns-03.com, ns-831.awsdns-39.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-1256.awsdns-29.org 205.251.196.232NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-1256.awsdns-29.org 2600:9000:5304:e800::1NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-1561.awsdns-03.co.uk 205.251.198.25NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-1561.awsdns-03.co.uk 2600:9000:5306:1900::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-29.awsdns-03.com 205.251.192.29NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-29.awsdns-03.com 2600:9000:5300:1d00::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-831.awsdns-39.net 205.251.195.63NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-831.awsdns-39.net 2600:9000:5303:3f00::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-831.awsdns-39.net

Found

Primary (MNAME)
ns-831.awsdns-39.net
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-1256.awsdns-29.org (205.251.196.232)1
ns-1256.awsdns-29.org (2600:9000:5304:e800::1)1
ns-1561.awsdns-03.co.uk (205.251.198.25)1
ns-1561.awsdns-03.co.uk (2600:9000:5306:1900::1)1
ns-29.awsdns-03.com (205.251.192.29)1
ns-29.awsdns-03.com (2600:9000:5300:1d00::1)1
ns-831.awsdns-39.net (205.251.195.63)1
ns-831.awsdns-39.net (2600:9000:5303:3f00::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-831.awsdns-39.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 1 is a plain counter.

DNSSEC

info

Signed, DS published at parent

Found

Validated by resolver
yes
Denial of existence
NSEC
Signatures valid until
21 October 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
39419ECDSAP256SHA256 (13)SHA256 3CEEA4B623EBA735…yes

DNSKEY in the zone

Key tagRoleAlgorithm
47583ZSK (256)ECDSAP256SHA256 (13)
63896ZSK (256)ECDSAP256SHA256 (13)
39419KSK (257)ECDSAP256SHA256 (13)

Checks

  • ✓ Signed and validated #27
    The zone is signed, the parent publishes a DS record, and the resolver validates the answers.
  • ✓ DS matches a key #28
    The DS record at the parent matches a key in the zone: key tag 39419 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: ECDSAP256SHA256 (13).
  • ✓ Short-lived signatures (online signing) #30
    Signatures are valid for 2h0m0s and created on demand; the current one was made at 2026-10-21 21:13 UTC and expires at 2026-10-21 23:28 UTC.
  • i
    NSEC
    The zone uses NSEC, so its full contents can be listed by walking the NSEC chain. That is fine unless the names are sensitive.
    #31

Records

info

25 records at the apex

Found

Read from
205.251.196.232:53
TypeValueTTL
SOAns-831.awsdns-39.net. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400900
NSns-1256.awsdns-29.org.172800
NSns-1561.awsdns-03.co.uk.172800
NSns-29.awsdns-03.com.172800
NSns-831.awsdns-39.net.172800
A46.163.95.211300
MX0 dfb-de.mail.protection.outlook.com.3600
TXT"1password-site-verification=4FUCQZ2EERATZGMTGCT6DNATHQ"600
TXT"3bzNm70+WBUiJF8gqzJkS+8VaOBG7nQaZChpdDeSIJo= "600
TXT"MS=74670875FFBF11F9D8E8772C9B8BBAA93D75F7A6"600
TXT"MS=ms10163556"600
TXT"MS=ms25216540"600
TXT"Mv2Fo6sqeKQ02ZdEHOwS1o+0m1Yomi+aq09+3g2XzQbDeV5uYiEvwQrNYFD6NlCLf7m2Eq3+mrEW8EJ9APX80Q=="600
TXT"_globalsign-domain-verification=T7s4BY3V8wFTQF1rBFlnLYbpGUA8xpekQJhjDXfo-p"600
TXT"amazonses:3ZcwUkOWxDpGv7mhS/PcNJHTK5q289NmdY06LJShPII="600
TXT"anthropic-domain-verification-s3m9rf=nOgmKr86nkcrPZu6BsvQMhnWt"600
TXT"apple-domain-verification=czY4hruDSKltGrjI"600
TXT"atlassian-domain-verification=h0XpTYoKgLsp4kC9VySb9H6OZ4wm0Ag3AEdNX0tobEIeYtqkKk9pzzUIH0WD42gU" "openai-domain-verification=dv-ztYw5jic1M1uW6hpR9USuj8r" "mentimeter-3bc30b87-60c4-47ae-8588-7e5a281f170d " "mentimeter-3bc30b87-60c4-47ae-8588-7e5a281f170d"600
TXT"google-site-verification=SZUuG3Ws6PshSgQ6IkKR-5ydyLlbWtMeWmbHLTU9dUs"600
TXT"google-site-verification=eEAW4ssb1JAEivDnJalo9bha6ixqy4qvUB3W78CNE-o"600
TXT"google-site-verification=uMrN39If7TxPgoiyG8L8IkdhzXlaXS_FDxvTQGwaROo"600
TXT"gzjuqhv40VvGqUhTxuRkkutlVvkM64RBglcYGpthHeM="600
TXT"jamie-domain-verification-ktjs0k=Y1fF9yQnZTTnW38oZB0A6yjQJ"600
TXT"miro-verification=f9dbaa4fb8d312a59cb8f18a5d7318a6c9706523"600
TXT"v=spf1 include:_u.dfb.de._spf.dmarclyeu.com -all"600

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 1h, NS 2d. The NS TTL at the parent is 1d and in the zone 2d; resolvers may use either.
  • ✓ 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