ardmediathek.de

Checked 21 October 2026, 21:30 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, 3 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns01.brandshelter.com 2a04:2b00:14cc::15NOERROR, 3 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns02.brandshelter.net 194.50.187.16NOERROR, 11 ms, authoritativenoyes / yesrefusedreg-wie1
ns02.brandshelter.net 2a04:2b00:14dd::16NOERROR, 11 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 2026082800 · primary ns01.brandshelter.com

Found

Primary (MNAME)
ns01.brandshelter.com
Contact (RNAME)
hostmaster.swr.de
Serial
2026082800
Refresh / retry
10800 s / 3600 s
Expire
604800 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
ns01.brandshelter.com (193.227.117.15)2026082800
ns01.brandshelter.com (2a04:2b00:14cc::15)2026082800
ns02.brandshelter.net (194.50.187.16)2026082800
ns02.brandshelter.net (2a04:2b00:14dd::16)2026082800

Checks

  • ✓ Serial 2026082800 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 7d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns01.brandshelter.com is one of the listed nameservers.
  • ✓ Contact hostmaster@swr.de #25
    The SOA RNAME hostmaster.swr.de means hostmaster@swr.de.
  • ✓ Date-based serial #26
    The serial 2026082800 follows the YYYYMMDDnn convention (2026-08-28).

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

21 records at the apex

Found

Read from
193.227.117.15:53
TypeValueTTL
SOAns01.brandshelter.com. hostmaster.swr.de. 2026082800 10800 3600 604800 36003600
NSns01.brandshelter.com.3600
NSns02.brandshelter.net.3600
A34.120.237.106300
MX0 .3600
TXT"v=spf1 -all"3600
TXT"6b4nd90r71rs19gtb6t2bqs1vgdp8slg"3600
TXT"_ocnhp3jtsyrrn2s3agmkqi6dnd638hk"3600
TXT"_pmsjw2ax3xdbd4nrs4r7l3959jf0qjd"3600
TXT"_r2zpcg6tlrawxblzw0mc39cblu6cjbt"3600
TXT"c526797a2fd84403b2b0722b5df18441"3600
TXT"cbd10spy1nctwtf675f9znmjz58d5vr6"3600
TXT"d6t6f2pzfxld9wd018lr3dzvfscc6tjm"3600
TXT"p2x51ylf5q4k6xwlr59blkh094g1st35"3600
TXT"qrtq80lrzd9rg674gf33hwbfryb6xn3q"3600
TXT"sz1d5ynbyv1ln3qw352qzcq4kcn5fc9g"3600
TXT"y1js7dm5tssrmrx25hk2jnry2w0dfgnc"3600
TXT"y95fd1chl987ktmxc0xqm6fsbdpv9kst"3600
TXT"facebook-domain-verification=jn1ndse4dzkoi6w9jsyiow6sv1umf6"3600
TXT"google-site-verification=1XCnG5rBlgVibOOOVaZsaL-dAf6X2sk0pFQnYFJbleo"3600
TXT"google-site-verification=t5lsu4OuoXS30daCkp9HP2tBSQi7FUBBKfnpJUch3HM"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 1h, 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