krombacher.de

Checked 21 October 2026, 23:10 UTC · via 8.8.8.8
!Passed with warnings
23 passed 1 warning 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

ns1.brandshelter.com, ns2.brandshelter.de, ns3.brandshelter.info, ns4.brandshelter.net, ns5.brandshelter.us

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns1.brandshelter.com, ns2.brandshelter.de, ns3.brandshelter.info, ns4.brandshelter.net, ns5.brandshelter.us
NS in the zone
ns1.brandshelter.com, ns2.brandshelter.de, ns3.brandshelter.info, ns4.brandshelter.net, ns5.brandshelter.us
NameserverAddressesNetwork (AS)Glue
ns1.brandshelter.com193.227.117.9 2a04:2b00:14cc::9AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-
ns2.brandshelter.de194.50.187.11 2a04:2b00:14dd::11AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-
ns3.brandshelter.info194.0.182.12 2a04:2b00:14ee::12AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-
ns4.brandshelter.net193.227.117.10 2a04:2b00:14cc::10AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-
ns5.brandshelter.us194.50.187.14 2a04:2b00:14dd::14AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-

Checks

  • ✓ 5 nameservers #6
    Delegated to ns1.brandshelter.com, ns2.brandshelter.de, ns3.brandshelter.info, ns4.brandshelter.net, ns5.brandshelter.us.
  • ✓ 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 3 IPv4 /24s and 3 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS1921 (RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT): 10 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 5 TLDs #12
    Nameserver names use the TLDs .com, .de, .info, .net, .us.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

info

10 of 10 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.brandshelter.com 193.227.117.9NOERROR, 3 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns1.brandshelter.com 2a04:2b00:14cc::9NOERROR, 4 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns2.brandshelter.de 194.50.187.11NOERROR, 12 ms, authoritativenoyes / yesrefusedreg-wie1
ns2.brandshelter.de 2a04:2b00:14dd::11NOERROR, 12 ms, authoritativenoyes / yesrefusedreg-wie1
ns3.brandshelter.info 194.0.182.12NOERROR, 3 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns3.brandshelter.info 2a04:2b00:14ee::12NOERROR, 4 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns4.brandshelter.net 193.227.117.10NOERROR, 4 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns4.brandshelter.net 2a04:2b00:14cc::10NOERROR, 4 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns5.brandshelter.us 194.50.187.14NOERROR, 12 ms, authoritativenoyes / yesrefusedreg-wie1
ns5.brandshelter.us 2a04:2b00:14dd::14NOERROR, 12 ms, authoritativenoyes / yesrefusedreg-wie1

Checks

  • ✓ All respond #14
    All 10 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: ns1.brandshelter.com: "RcodeZero DNS"; ns2.brandshelter.de: "reg-wie1"; ns3.brandshelter.info: "RcodeZero DNS"; ns4.brandshelter.net: "RcodeZero DNS"; ns5.brandshelter.us: "reg-wie1".
    #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 2026102001 · primary ns1.brandshelter.com

Found

Primary (MNAME)
ns1.brandshelter.com
Contact (RNAME)
tech.brandshelter.com
Serial
2026102001
Refresh / retry
10800 s / 3600 s
Expire
604800 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
ns1.brandshelter.com (193.227.117.9)2026102001
ns1.brandshelter.com (2a04:2b00:14cc::9)2026102001
ns2.brandshelter.de (194.50.187.11)2026102001
ns2.brandshelter.de (2a04:2b00:14dd::11)2026102001
ns3.brandshelter.info (194.0.182.12)2026102001
ns3.brandshelter.info (2a04:2b00:14ee::12)2026102001
ns4.brandshelter.net (193.227.117.10)2026102001
ns4.brandshelter.net (2a04:2b00:14cc::10)2026102001
ns5.brandshelter.us (194.50.187.14)2026102001
ns5.brandshelter.us (2a04:2b00:14dd::14)2026102001

Checks

  • ✓ Serial 2026102001 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 7d, negative TTL 5m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.brandshelter.com is one of the listed nameservers.
  • ✓ Contact tech@brandshelter.com #25
    The SOA RNAME tech.brandshelter.com means tech@brandshelter.com.
  • ✓ Date-based serial #26
    The serial 2026102001 follows the YYYYMMDDnn convention (2026-10-20).

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

25 records at the apex

Found

Read from
193.227.117.9:53
TypeValueTTL
SOAns1.brandshelter.com. tech.brandshelter.com. 2026102001 10800 3600 604800 300300
NSns1.brandshelter.com.3600
NSns2.brandshelter.de.3600
NSns3.brandshelter.info.3600
NSns4.brandshelter.net.3600
NSns5.brandshelter.us.3600
A18.199.22.252300
MX0 krombacher-de.mail.protection.outlook.com.300
TXT"MS=ms31400489"86400
TXT"ZOOM_verify_H7pqrkmIS66CWjrJaq_Ubg"86400
TXT"apple-domain-verification=wPOhW1jx8EdCaThe"86400
TXT"MS=B45555082644E28151974D52FA43706A2C15D54D"86400
TXT"jamf-site-verification=7bLnaAn-4KxUl9P9i1nHHw"86400
TXT"jetbrains-domain-verification=5hn9co3nisjcwz7cxmm02il81"86400
TXT"shopify-verification-code=Ru9LzOHoxFw3WwPs1SW2FoLxyDdIKP"86400
TXT"miro-verification=deefc442e858a982237e69cdde3392113a5325e8"86400
TXT"cursor-domain-verification-5pa2st=RbZpc7UnSI8kPtL3QcVdbYxGG"86400
TXT"facebook-domain-verification=rqncxrcjy2blmn0ib1tqab89q41w4a"86400
TXT"facebook-domain-verification=xoa33i4h5chl2uuwrox244b2uwg14j"86400
TXT"google-site-verification=pJ5lmiMoPAIAPxAmfXEFZoOXvAFsezrlwRQHMVKLteI"86400
TXT"google-site-verification=shp0-bD742-l1JFVxxZMkJ1Tn5ojvcDtgUT-dPDJ5oU"86400
TXT"duo_sso_verification=26UKBBDyzZNJhVWO4UuifCLNc9uaoiz4rfLdJ2XGGGSy0hbVZpelJbkeXAtkeyCC"86400
TXT"s4siTCqxv5qBAvWHMtB0H0Qil6dTOQZam2rVDpQszdXrA2nRZeaYpLvDKJ8dicSKSAGyCbMBheJZDgBIK9pwOw=="86400
TXT"atlassian-domain-verification=jM8wbPzssEMHXm5k6cmG4vhRZmCH7PNIuOvUIAMNwiN6OBt9AmyjgimR5mWh6vBk"86400
TXT"v=spf1 include:mail.login.krombacher.de include:spf.docuguide.com include:spf.protection.outlook.com include:spf.eu.exclaimer.net include:ispgateway.de include:_spf.salesforce.com -all"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 5m, 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.
  • ✓ 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