concordia.de

Checked 21 October 2026, 22:10 UTC · via 8.8.8.8
!Passed with warnings
25 passed 2 warnings 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

anycast.iwelt.de, anycast2.iwelt.domains

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
anycast.iwelt.de, anycast2.iwelt.domains
NS in the zone
anycast.iwelt.de, anycast2.iwelt.domains
NameserverAddressesNetwork (AS)Glue
anycast.iwelt.de192.174.68.102 2001:67c:1bc::102AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-
anycast2.iwelt.domains176.97.158.102 2001:67c:10b8::102AS1921 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: anycast.iwelt.de, anycast2.iwelt.domains.
    #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 .de, .domains.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

info

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
anycast.iwelt.de 192.174.68.102NOERROR, 3 ms, authoritativenoyes / yesrefusedRcodeZero DNS
anycast.iwelt.de 2001:67c:1bc::102NOERROR, 4 ms, authoritativenoyes / yesrefusedRcodeZero DNS
anycast2.iwelt.domains 176.97.158.102NOERROR, 12 ms, authoritativenoyes / yesrefusedreg-wie1
anycast2.iwelt.domains 2001:67c:10b8::102NOERROR, 15 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: anycast.iwelt.de: "RcodeZero DNS"; anycast2.iwelt.domains: "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

warn

serial 2026075263 · primary anycast.iwelt.de

Found

Primary (MNAME)
anycast.iwelt.de
Contact (RNAME)
domainmaster.iwelt-ag.net
Serial
2026075263
Refresh / retry
43200 s / 7200 s
Expire
1209600 s
Negative TTL
180 s

Serial per nameserver

NameserverSerial
anycast.iwelt.de (192.174.68.102)2026075263
anycast.iwelt.de (2001:67c:1bc::102)2026075263
anycast2.iwelt.domains (176.97.158.102)2026075263
anycast2.iwelt.domains (2001:67c:10b8::102)2026075263

Checks

  • ✓ Serial 2026075263 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    negative caching TTL (minimum) 3m is outside 5m–1d (RFC 2308 recommends 1–3 hours). Current values: refresh 12h, retry 2h, expire 14d, negative TTL 3m.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver anycast.iwelt.de is one of the listed nameservers.
  • ✓ Contact domainmaster@iwelt-ag.net #25
    The SOA RNAME domainmaster.iwelt-ag.net means domainmaster@iwelt-ag.net.
  • ✓ Timestamp serial #26
    The serial 2026075263 is a Unix timestamp (2034-03-15 22:41 UTC).

DNSSEC

pass

Signed, DS published at parent

Found

Validated by resolver
yes
Denial of existence
NSEC3
NSEC3
0 iterations, 0-byte salt
Signatures valid until
29 October 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
45117ECDSAP256SHA256 (13)SHA256 B41AED54AC2316E8…yes

DNSKEY in the zone

Key tagRoleAlgorithm
38680ZSK (256)ECDSAP256SHA256 (13)
45117KSK (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 45117 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: ECDSAP256SHA256 (13).
  • ✓ Signatures valid until 2026-10-29 #30
    The earliest DNSKEY/SOA signature expires at 2026-10-29 00:00 UTC.
  • ✓ NSEC3 as recommended #31
    The zone uses NSEC3 with 0 iterations and no salt (RFC 9276).

Records

warn

11 records at the apex

Found

Read from
192.174.68.102:53
TypeValueTTL
SOAanycast.iwelt.de. domainmaster.iwelt-ag.net. 2026075263 43200 7200 1209600 180180
NSanycast.iwelt.de.180
NSanycast2.iwelt.domains.180
A185.148.170.48180
MX10 mx01.hornetsecurity.com.180
MX20 mx02.hornetsecurity.com.180
MX30 mx03.hornetsecurity.com.180
MX40 mx04.hornetsecurity.com.180
TXT"apple-domain-verification=L3kE1iNKesuT6TsA"180
TXT"atlassian-domain-verification=ZlxmGbLMgUj4z9G1KGxa3qatxfDzMpennx0caE00Q1ak9z7s6egRNuyi3OshUTyw"180
TXT"v=spf1 a mx ip4:212.4.174.19 ip4:212.4.174.73 ip4:212.4.174.202 ip4:85.215.187.195 ip4:185.148.170.30/31 ip4:212.29.0.111 ip4:212.34.64.185 include:_spf.itandtel.at include:spf.info-online.org include:spf.hornetsecurity.com include:spf.protection.outlook." "com include:spf.mailjet.com -all"180

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (3m), MX (3m), NS (3m). Low TTLs are useful just before a planned change. The NS TTL at the parent is 1d and in the zone 3m; resolvers may use either.
    #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