mainpost.de

Checked 21 October 2026, 23:21 UTC · via 8.8.8.8
!Passed with warnings
22 passed 4 warnings 0 failed 3 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

warn

dns.iwelt-ag.net, dns2.iwelt-ag.net, dns3.iwelt-ag.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns.iwelt-ag.net, dns2.iwelt-ag.net, dns3.iwelt-ag.de
NS in the zone
dns.iwelt-ag.net, dns2.iwelt-ag.net, dns3.iwelt-ag.de
NameserverAddressesNetwork (AS)Glue
dns.iwelt-ag.net82.212.222.10 2a00:cb0:1::10AS29624 KRICK-TECHNOLOGIC-AS - Krick Management GmbH trading as iWelt GmbH + Co. KG, DE AS29624 KRICK-TECHNOLOGIC-AS - Krick Management GmbH trading as iWelt GmbH + Co. KG, DE-
dns2.iwelt-ag.net82.212.255.10 2a00:cb0:8001::10AS13289 ASIWELT - Krick Management GmbH trading as iWelt GmbH + Co. KG, DE AS13289 ASIWELT - Krick Management GmbH trading as iWelt GmbH + Co. KG, DE-
dns3.iwelt-ag.de85.236.41.196 2001:4178:2:1328::10AS15456 INTERNETX-AS - InterNetX GmbH, DE AS15456 INTERNETX-AS - InterNetX GmbH, DE85.236.41.196

Checks

  • ✓ 3 nameservers #6
    Delegated to dns.iwelt-ag.net, dns2.iwelt-ag.net, dns3.iwelt-ag.de.
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • !
    Glue differs from the zone
    The addresses at the parent (glue) differ from the addresses in the zone: dns3.iwelt-ag.de (glue 85.236.41.196, zone 85.236.41.196, 2001:4178:2:1328::10). Update the glue at your registrar.
    #8
  • ✓ 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.
  • ✓ 3 autonomous systems #11
    The nameservers are spread over: AS13289 (ASIWELT - Krick Management GmbH trading as iWelt GmbH + Co. KG, DE): 2 addresses; AS15456 (INTERNETX-AS - InterNetX GmbH, DE): 2 addresses; AS29624 (KRICK-TECHNOLOGIC-AS - Krick Management GmbH trading as iWelt GmbH + Co. KG, DE): 2 addresses.
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .de, .net.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

pass

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns.iwelt-ag.net 82.212.222.10NOERROR, 6 ms, authoritativenoyes / yesrefused-
dns.iwelt-ag.net 2a00:cb0:1::10NOERROR, 6 ms, authoritativenoyes / yesrefused-
dns2.iwelt-ag.net 82.212.255.10NOERROR, 17 ms, authoritativenoyes / yesrefused-
dns2.iwelt-ag.net 2a00:cb0:8001::10NOERROR, 18 ms, authoritativenoyes / yesrefused-
dns3.iwelt-ag.de 85.236.41.196NOERROR, 10 ms, authoritativenoyes / yesrefused-
dns3.iwelt-ag.de 2001:4178:2:1328::10NOERROR, 16 ms, authoritativenoyes / yesrefused-

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.
  • ✓ No version disclosed #17
    The nameservers don't reveal their software version.
  • ✓ 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 2026101601 · primary dns.iwelt-ag.net

Found

Primary (MNAME)
dns.iwelt-ag.net
Contact (RNAME)
domainmaster.iwelt-ag.net
Serial
2026101601
Refresh / retry
43200 s / 3600 s
Expire
2419200 s
Negative TTL
180 s

Serial per nameserver

NameserverSerial
dns.iwelt-ag.net (82.212.222.10)2026101601
dns.iwelt-ag.net (2a00:cb0:1::10)2026101601
dns2.iwelt-ag.net (82.212.255.10)2026101601
dns2.iwelt-ag.net (2a00:cb0:8001::10)2026101601
dns3.iwelt-ag.de (85.236.41.196)2026101601
dns3.iwelt-ag.de (2001:4178:2:1328::10)2026101601

Checks

  • ✓ Serial 2026101601 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 1h, expire 28d, negative TTL 3m.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver dns.iwelt-ag.net is one of the listed nameservers.
  • ✓ Contact domainmaster@iwelt-ag.net #25
    The SOA RNAME domainmaster.iwelt-ag.net means domainmaster@iwelt-ag.net.
  • ✓ 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

warn

19 records at the apex

Found

Read from
82.212.222.10:53
TypeValueTTL
SOAdns.iwelt-ag.net. domainmaster.iwelt-ag.net. 2026101601 43200 3600 2419200 180180
NSdns3.iwelt-ag.de.180
NSdns.iwelt-ag.net.180
NSdns2.iwelt-ag.net.180
A13.248.139.131180
MX30 mx03.hornetsecurity.com.180
MX20 mx02.hornetsecurity.com.180
MX10 mx01.hornetsecurity.com.180
MX40 mx04.hornetsecurity.com.180
TXT"tollbit-domain-verification=1e14445ca0f07390e60319784d498b3caa0bfb09a46ba1b4ea2689c83f47e4e8"180
TXT"Sendinblue-code:57732902b62694a87664544600997990"180
TXT"MS=ms24452758"180
TXT"facebook-domain-verification=lh3ud3xn9yu33zbe2n4kcx9y9ip0p2"180
TXT"apple-domain-verification=BGhGiRkbvTXloMMS"180
TXT"have-i-been-pwned-verification=dweb_fm1yx8zyj08r2if49p5yyqe7"180
TXT"google-site-verification=SfMZxvbKZpiHIhpMzDWM4R_UAgtc_HzZ1ZN-BLCgV40"180
TXT"google-site-verification=g7dLLJsjbfcpEbYuiUuymvZPEY1VoO1yRl_2JC3M_90"180
TXT"adobe-idp-site-verification=81d4738b4017aded75851ae31077699f5bcb59f00082d7810eee68217f76e623"180
TXT"v=spf1 include:spf.hornetsecurity.com include:spf.protection.outlook.com include:spf.fidion.de include:_spfi.evolver.de include:spf.mandrillapp.com include:_spf.senders.scnem.com include:spf.sendinblue.com include:agenturserver.de include:spf.mailjet.com " "+ip4:91.204.33.127 -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