mainz.de

Checked 21 October 2026, 23:21 UTC · via 8.8.8.8
!Passed with warnings
28 passed 1 warning 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.udag.de, ns.udag.net, ns.udag.org

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns.udag.de, ns.udag.net, ns.udag.org
NS in the zone
ns.udag.de, ns.udag.net, ns.udag.org
NameserverAddressesNetwork (AS)Glue
ns.udag.de217.160.80.253 2001:8d8:fe:53:217:160:80:253AS8560 IONOS-AS - IONOS SE, DE AS8560 IONOS-AS - IONOS SE, DE217.160.80.253 2001:8d8:fe:53:217:160:80:253
ns.udag.net185.132.33.253 2607:f1c0:fe:53:185:132:33:253AS15418 IONOS-ANYCAST - Fasthosts Internet Limited, GB AS15418 IONOS-ANYCAST - Fasthosts Internet Limited, GB-
ns.udag.org185.132.34.253 2607:f1c0:fe:53:185:132:34:253AS15418 IONOS-ANYCAST - Fasthosts Internet Limited, GB AS15418 IONOS-ANYCAST - Fasthosts Internet Limited, GB-

Checks

  • ✓ 3 nameservers #6
    Delegated to ns.udag.de, ns.udag.net, ns.udag.org.
  • ✓ 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 2 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS15418 (IONOS-ANYCAST - Fasthosts Internet Limited, GB): 4 addresses; AS8560 (IONOS-AS - IONOS SE, DE): 2 addresses.
  • ✓ Nameserver names under 3 TLDs #12
    Nameserver names use the TLDs .de, .net, .org.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

info

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns.udag.de 217.160.80.253NOERROR, 9 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
ns.udag.de 2001:8d8:fe:53:217:160:80:253NOERROR, 9 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
ns.udag.net 185.132.33.253NOERROR, 3 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
ns.udag.net 2607:f1c0:fe:53:185:132:33:253NOERROR, 3 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
ns.udag.org 185.132.34.253NOERROR, 3 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
ns.udag.org 2607:f1c0:fe:53:185:132:34:253NOERROR, 3 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/

Checks

  • ✓ All respond #14
    All 6 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.udag.de: "Served by PowerDNS - https://www.powerdns.com/"; ns.udag.net: "Served by PowerDNS - https://www.powerdns.com/"; ns.udag.org: "Served by PowerDNS - https://www.powerdns.com/".
    #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 2025050914 · primary ns.udag.de

Found

Primary (MNAME)
ns.udag.de
Contact (RNAME)
hostmaster.united-domains.de
Serial
2025050914
Refresh / retry
10800 s / 3600 s
Expire
604800 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
ns.udag.de (217.160.80.253)2025050914
ns.udag.de (2001:8d8:fe:53:217:160:80:253)2025050914
ns.udag.net (185.132.33.253)2025050914
ns.udag.net (2607:f1c0:fe:53:185:132:33:253)2025050914
ns.udag.org (185.132.34.253)2025050914
ns.udag.org (2607:f1c0:fe:53:185:132:34:253)2025050914

Checks

  • ✓ Serial 2025050914 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 ns.udag.de is one of the listed nameservers.
  • ✓ Contact hostmaster@united-domains.de #25
    The SOA RNAME hostmaster.united-domains.de means hostmaster@united-domains.de.
  • ✓ Date-based serial #26
    The serial 2025050914 follows the YYYYMMDDnn convention (2025-05-09).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver
yes
Denial of existence
NSEC3
NSEC3
21 iterations, 24-byte salt
Signatures valid until
24 December 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
54152ECDSAP256SHA256 (13)SHA256 1C774805E7163FF5…yes

DNSKEY in the zone

Key tagRoleAlgorithm
55652ZSK (256)ECDSAP256SHA256 (13)
54152KSK (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 54152 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: ECDSAP256SHA256 (13).
  • ✓ Signatures valid until 2026-12-24 #30
    The earliest DNSKEY/SOA signature expires at 2026-12-24 10:45 UTC.
  • !
    NSEC3 with extra iterations or salt
    NSEC3 uses 21 iterations and a 24-byte salt. RFC 9276 recommends 0 iterations and no salt: extra iterations cost resolvers CPU and add no real protection, and some validators treat high counts as insecure.
    #31

Records

info

13 records at the apex

Found

Read from
217.160.80.253:53
TypeValueTTL
SOAns.udag.de. hostmaster.united-domains.de. 2025050914 10800 3600 604800 360086400
NSns.udag.de.86400
NSns.udag.org.86400
NSns.udag.net.86400
A49.13.42.92600
AAAA2a01:4f8:1c1d:6d4::1600
MX10 mailmx0001.rlp.de.600
MX10 mailmx0002.rlp.de.600
MX10 mailmx0004.rlp.de.600
MX10 mailmx0003.rlp.de.600
TXT"v=spf1 ip4:83.243.48.64/26 ~all"600
TXT"google-site-verification=688uzfR7rXA9_g9mFZEVlKIDPrZNPAlZPWsOp5VKKC0"600
TXT"b0c72e1ec93221f2c4c728bc16132625b339dc4c"600

Checks

  • ✓ TTLs within range #32
    TTLs: A 10m, AAAA 10m, MX 10m, NS 1d.
  • ✓ 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