merck.de

Checked 21 October 2026, 23:22 UTC · via 8.8.8.8
!Passed with warnings
22 passed 1 warning 0 failed 6 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

ns01.brandshelter.com, ns02.brandshelter.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns01.brandshelter.com, ns02.brandshelter.net
NS in the zone
ns01.brandshelter.com, ns02.brandshelter.net
NameserverAddressesNetwork (AS)Glue
ns01.brandshelter.com193.227.117.15 2a04:2b00:14cc::15AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-
ns02.brandshelter.net194.50.187.16 2a04:2b00:14dd::16AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns01.brandshelter.com, ns02.brandshelter.net.
    #6
  • ✓ 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 2 IPv4 /24s and 2 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): 4 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 2 TLDs #12
    Nameserver names use the TLDs .com, .net.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

info

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns01.brandshelter.com 193.227.117.15NOERROR, 8 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns01.brandshelter.com 2a04:2b00:14cc::15NOERROR, 8 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns02.brandshelter.net 194.50.187.16NOERROR, 11 ms, authoritativenoyes / yesrefusedreg-wie1
ns02.brandshelter.net 2a04:2b00:14dd::16NOERROR, 16 ms, authoritativenoyes / yesrefusedreg-wie1

Checks

  • ✓ All respond #14
    All 4 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: ns01.brandshelter.com: "RcodeZero DNS"; ns02.brandshelter.net: "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 2026101601 · primary ns01.brandshelter.com

Found

Primary (MNAME)
ns01.brandshelter.com
Contact (RNAME)
tech.brandshelter.com
Serial
2026101601
Refresh / retry
10800 s / 3600 s
Expire
604800 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
ns01.brandshelter.com (193.227.117.15)2026101601
ns01.brandshelter.com (2a04:2b00:14cc::15)2026101601
ns02.brandshelter.net (194.50.187.16)2026101601
ns02.brandshelter.net (2a04:2b00:14dd::16)2026101601

Checks

  • ✓ Serial 2026101601 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 ns01.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 2026101601 follows the YYYYMMDDnn convention (2026-10-16).

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

36 records at the apex

Found

Read from
193.227.117.15:53
TypeValueTTL
SOAns01.brandshelter.com. tech.brandshelter.com. 2026101601 10800 3600 604800 300300
NSns01.brandshelter.com.300
NSns02.brandshelter.net.300
A185.123.52.199300
AAAA2a10:ec6:1:3:185:123:52:199300
MX10 mxa-005f4802.gslb.pphosted.com.300
MX10 mxb-005f4802.gslb.pphosted.com.300
TXT"MS=ms51222593"600
TXT"695zgz312t0gk8jg7b5bxvcdmvjkk906"600
TXT"82wchf6dmjz9kqtvq9rppbdylgfvbfn2"600
TXT"_f2cdqt3trnqzbf9e8m9bsdfrex75e0y"600
TXT"_hwfazjgik9ck3sshxapn7yrfv5qhynz"600
TXT"_n3xi44n6vrb4bx7xu85q7pdg74vlvuf"600
TXT"stcwc9p407t35y14n36hn5cz2s9lf0qk"600
TXT"z0rltgdpw4092r3pfk8kfvcl8rjm1jwj"600
TXT"zshxbqm11t145jszs97d6fkp82h5kgp3"600
TXT"9DAA-6F09-B37E-475C-29C3-85C2-F292-E971"600
TXT"apple-domain-verification=B8lYr7UoGeHczNOL"600
TXT"facebook-domain-verification=1dfm3polulu78vowioiz96odo6yj1m"600
TXT"smartsheet-site-validation=NTno55QxLezuVOvLAG05eV7SbSVyLwkS"600
TXT"globalsign-domain-verification=1fa9768f734c9061fccb56ce454c4996"600
TXT"globalsign-domain-verification=432B0F49FEF0FAA55B7C68F4FA475643"600
TXT"globalsign-domain-verification=55C920AD30DC469985B6393C11D5880D"600
TXT"globalsign-domain-verification=5942E1717FB1F890308CF35B6F196636"600
TXT"globalsign-domain-verification=9B068CC254FE8E89EF73551DB1E74D0F"600
TXT"globalsign-domain-verification=B4D4F26DFA8E810C9AD6FDC7AC83E6B0"600
TXT"globalsign-domain-verification=B69D82ECDAB95911C8EAD40A1B3CFBC6"600
TXT"globalsign-domain-verification=B79D0218DB7E59E447EEF2F1F32194B4"600
TXT"globalsign-domain-verification=E9C02BE211F1BC42DC5883178335001A"600
TXT"globalsign-domain-verification=F71F0513E2EC3375DCB6378EE0C6AAE6"600
TXT"globalsign-domain-verification=e866a61336cb5fef511b2b63d2fabd3e"600
TXT"google-site-verification=7Vz3-BdqvfCw-meDXqr4MHgj8t3kQDu5GrnR6QrUYNA"600
TXT"_globalsign-domain-verification=3DA9lo0aKynv8l9sh5xz2fku4v1daaysBfW-4ajvvo"600
TXT"_globalsign-domain-verification=bBnDLgw0Trfq4xFVgiX1A-ekV6aAp6iohTI-q3CFy-"600
TXT"_globalsign-domain-verification=mxLOQfk5kfpkwXkneyRdH4GMqoK1UkKsexyFzL3rQi"600
TXT"v=spf1 include:spf-005f4802.pphosted.com include:spf.protection.outlook.com ~all"600

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, AAAA 5m, MX 5m, NS 5m. The NS TTL at the parent is 1d and in the zone 5m; 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