rtl.de

Checked 22 October 2026, 00:01 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

pass

ns-a.eurodns.com, ns-b.eurodns.org, ns-c.eurodns.eu, ns-d.eurodns.biz

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns-a.eurodns.com, ns-b.eurodns.org, ns-c.eurodns.eu, ns-d.eurodns.biz
NS in the zone
ns-a.eurodns.com, ns-b.eurodns.org, ns-c.eurodns.eu, ns-d.eurodns.biz
NameserverAddressesNetwork (AS)Glue
ns-a.eurodns.com199.167.66.106 2610:1c8:b002::106AS23393 NUCDN - NuCDN LLC, US AS23393 NUCDN - NuCDN LLC, US-
ns-b.eurodns.org104.37.178.106 2610:1c8:b001::106AS23393 NUCDN - NuCDN LLC, US AS23393 NUCDN - NuCDN LLC, US-
ns-c.eurodns.eu192.174.68.110 2001:67c:1bc::110AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-
ns-d.eurodns.biz176.97.158.110 2001:67c:10b8::110AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns-a.eurodns.com, ns-b.eurodns.org, ns-c.eurodns.eu, ns-d.eurodns.biz.
  • ✓ 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.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS1921 (RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT): 4 addresses; AS23393 (NUCDN - NuCDN LLC, US): 4 addresses.
  • ✓ Nameserver names under 4 TLDs #12
    Nameserver names use the TLDs .biz, .com, .eu, .org.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

info

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns-a.eurodns.com 199.167.66.106NOERROR, 8 ms, authoritativenoyes / yesrefused-
ns-a.eurodns.com 2610:1c8:b002::106NOERROR, 8 ms, authoritativenoyes / yesrefused-
ns-b.eurodns.org 104.37.178.106NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns-b.eurodns.org 2610:1c8:b001::106NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns-c.eurodns.eu 192.174.68.110NOERROR, 5 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns-c.eurodns.eu 2001:67c:1bc::110NOERROR, 6 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns-d.eurodns.biz 176.97.158.110NOERROR, 13 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns-d.eurodns.biz 2001:67c:10b8::110NOERROR, 11 ms, authoritativenoyes / yesrefusedRcodeZero DNS

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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: ns-c.eurodns.eu: "RcodeZero DNS"; ns-d.eurodns.biz: "RcodeZero DNS".
    #17
  • ✓ 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 2026102102 · primary ns-a.eurodns.com

Found

Primary (MNAME)
ns-a.eurodns.com
Contact (RNAME)
hostmaster.eurodns.com
Serial
2026102102
Refresh / retry
43200 s / 7200 s
Expire
1209600 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
ns-a.eurodns.com (199.167.66.106)2026102102
ns-a.eurodns.com (2610:1c8:b002::106)2026102102
ns-b.eurodns.org (104.37.178.106)2026102102
ns-b.eurodns.org (2610:1c8:b001::106)2026102102
ns-c.eurodns.eu (192.174.68.110)2026102102
ns-c.eurodns.eu (2001:67c:1bc::110)2026102102
ns-d.eurodns.biz (176.97.158.110)2026102102
ns-d.eurodns.biz (2001:67c:10b8::110)2026102102

Checks

  • ✓ Serial 2026102102 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 12h, retry 2h, expire 14d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns-a.eurodns.com is one of the listed nameservers.
  • ✓ Contact hostmaster@eurodns.com #25
    The SOA RNAME hostmaster.eurodns.com means hostmaster@eurodns.com.
  • ✓ Date-based serial #26
    The serial 2026102102 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

warn

37 records at the apex

Found

Read from
199.167.66.106:53
TypeValueTTL
SOAns-a.eurodns.com. hostmaster.eurodns.com. 2026102102 43200 7200 1209600 36003600
NSns-a.eurodns.com.86400
NSns-b.eurodns.org.86400
NSns-c.eurodns.eu.86400
NSns-d.eurodns.biz.86400
A63.187.190.16649
A3.78.195.18549
A52.57.112.24049
MX10 assur.rtl.de.3600
MX10 marduk.rtl.de.3600
MX20 sul.rtl.de.3600
MX20 sulis.rtl.de.3600
TXT"8mgn56hpk2h8vbij6o6et98h83"600
TXT"COA/aMCPlLOa/eLcBucw4jUuMFLWZpX9CNMxm2DM2lx252rhaCTZycXV+Do0+k92JKHg7Dua1e4zRzpUUxT6dA=="600
TXT"MS=ms52349720"600
TXT"Sendinblue-code:6ef1bdca0140128a0b0cdffd769c529f"600
TXT"apple-domain-verification=z15uDygTYu2zHkXr"600
TXT"atlassian-domain-verification=Kl3ByU1tsfV9fKiC7TDDZYz1uCeTeUo0SSEh5SitZ9q99Ua74O571fgiIg//j5Hn"600
TXT"atlassian-domain-verification=U53qT9UWljJ6lcPAcinI5npMxdsy1/xvpTBq4p0CX7iTm3LmX2PLe8fEg09iGByk"600
TXT"atlassian-domain-verification=VBCjnmVc6Kf7SAyDmdeHFPRVe11WgWzbaIKDY19iP0mLcY5/IDCa6Xa6pNa/rd1W"600
TXT"brevo-code:6ef1bdca0140128a0b0cdffd769c529f"600
TXT"bw=68gMThWX9Ho1SVFXRjXG808Mei5H3Y64wlvu9b4qTg3h"600
TXT"elevenlabs=d3LOMaZIxon3Ord_HI5dUIHJDc1StluEeZAs-iF9fsE"600
TXT"extensis-domain-verification=54e6d2f6-0e4c-41bf-b431-62ee6cbafba9"600
TXT"google-site-verification=TATBLwUTAuUYbAG4JTTioqc-L3DxUkfoT0nTBnmpOm8"600
TXT"jamf-site-verification=tZGEVFCjsfOAp5c3ZXGX3g"600
TXT"knowbe4-site-verification=9f84b0069b8711b7d78efc51717ae64a"600
TXT"miro-verification=cb749e1ffbea1463e5ad819295f54687fc362039"600
TXT"mongodb-site-verification=FpUrNPM8Cxa9RyJC4t3hGyjHfoRuKgvs"600
TXT"oaUBmVBGfG6exGYqQAo2GWPZeOnb98ZpVsqkqcc01KW60xDfL72aY6VxG1LfGG7meSgTKqlWwf5UG3cSkdXmbQ=="600
TXT"openai-domain-verification=dv-k3MM1WGFah2Gqy9z9kDYsbRH"600
TXT"perplexity-ai-domain-verification-4sb00b=c4XtTzbATgpPTyDo0eoH8Zwir"600
TXT"v=spf1 a mx ip4:217.118.170.10 ip4:193.16.163.0/24 include:mail.zendesk.com include:spf.mailjet.com include:spf.crsend.com include:_spf.zimpel.de ip4:185.41.28.0/22 ip4:94.143.16.0/21 ip4:185.24.144.0/22 ip4:153.92.224.0/19 ip4:213.32.128.0/18 ip4:185.10" "7.232.0/22 ip4:77.32.128.0/18 ip4:77.32.192.0/19 ip4:212.146.192.0/18 ip4:172.246.0.0/18 ip4:34.215.113.156 include:_spf.salesforce.com include:143803951.spf10.hubspotemail.net include:spf.protection.outlook.com ~all"600
TXT"wiz-domain-verification=67db6b84ffd9424a08abcdc7a9eb45f947f907dd9abf450c31d0e0d5609496b1"600
TXT"x644d3sf2f2vvtzb3vp2qyyd1bm5c85g"600
TXT"wiz-domain-verification=9e4a97966d4c37d37f2aaf35a04cc02be28b58a55e2b5d5b28584e3848cb104f"600
TXT"brevo-code:e5d26db517fb0a9cc49b34b804c07d6c"600

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (49s). Low TTLs are useful just before a planned change.
    #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