signal-iduna.de

Checked 22 October 2026, 00:10 UTC · via 8.8.8.8
!Passed with warnings
24 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-sec.signal-iduna.de, ns.signal-iduna.de, pns.dtag.de, secondary004.dtag.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns-sec.signal-iduna.de, ns.signal-iduna.de, pns.dtag.de, secondary004.dtag.net
NS in the zone
ns-sec.signal-iduna.de, ns.signal-iduna.de, pns.dtag.de, secondary004.dtag.net
NameserverAddressesNetwork (AS)Glue
ns-sec.signal-iduna.de5.183.137.35 2a0e:dc00:4000:1800::2AS208653 SI-ASN - SIGNAL IDUNA Krankenversicherung a.G., DE AS208653 SI-ASN - SIGNAL IDUNA Krankenversicherung a.G., DE5.183.137.35 2a0e:dc00:4000:1800::2
ns.signal-iduna.de5.183.137.34 2a0e:dc00:4000:1800::1AS208653 SI-ASN - SIGNAL IDUNA Krankenversicherung a.G., DE AS208653 SI-ASN - SIGNAL IDUNA Krankenversicherung a.G., DE5.183.137.34 2a0e:dc00:4000:1800::1
pns.dtag.de194.25.0.125 2003:40:8000::100AS3320 DTAG - Deutsche Telekom AG, DE AS3320 DTAG - Deutsche Telekom AG, DE194.25.0.125 2003:40:8000::100
secondary004.dtag.net195.244.245.27 2a00:fa8:3:0:100:0:4:1AS5605 NETUSE - NetUSE AG, DE AS5605 NETUSE - NetUSE AG, DE-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns-sec.signal-iduna.de, ns.signal-iduna.de, pns.dtag.de, secondary004.dtag.net.
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • ✓ Glue present and correct #8
    Glue is published for the nameservers inside the zone: ns-sec.signal-iduna.de, ns.signal-iduna.de.
  • ✓ 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: AS208653 (SI-ASN - SIGNAL IDUNA Krankenversicherung a.G., DE): 4 addresses; AS3320 (DTAG - Deutsche Telekom AG, DE): 2 addresses; AS5605 (NETUSE - NetUSE AG, 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

info

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns-sec.signal-iduna.de 5.183.137.35NOERROR, 11 ms, authoritativenoyes / yesrefused-
ns-sec.signal-iduna.de 2a0e:dc00:4000:1800::2NOERROR, 12 ms, authoritativenoyes / yesrefused-
ns.signal-iduna.de 5.183.137.34NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns.signal-iduna.de 2a0e:dc00:4000:1800::1NOERROR, 13 ms, authoritativenoyes / yesrefused-
pns.dtag.de 194.25.0.125NOERROR, 10 ms, authoritativenoyes / yesrefusedDomainNameServer
pns.dtag.de 2003:40:8000::100NOERROR, 7 ms, authoritativenoyes / yesrefusedDomainNameServer
secondary004.dtag.net 195.244.245.27NOERROR, 14 ms, authoritativenoyes / yesrefusedDomainNameServer
secondary004.dtag.net 2a00:fa8:3:0:100:0:4:1NOERROR, 17 ms, authoritativenoyes / yesrefusedDomainNameServer

Checks

  • ✓ All respond #14
    All 8 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: pns.dtag.de: "DomainNameServer"; secondary004.dtag.net: "DomainNameServer".
    #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 2026092401 · primary ns.signal-iduna.de

Found

Primary (MNAME)
ns.signal-iduna.de
Contact (RNAME)
dnsadmin.signal-iduna.de
Serial
2026092401
Refresh / retry
86400 s / 10800 s
Expire
604800 s
Negative TTL
43200 s

Serial per nameserver

NameserverSerial
ns-sec.signal-iduna.de (5.183.137.35)2026092401
ns-sec.signal-iduna.de (2a0e:dc00:4000:1800::2)2026092401
ns.signal-iduna.de (5.183.137.34)2026092401
ns.signal-iduna.de (2a0e:dc00:4000:1800::1)2026092401
pns.dtag.de (194.25.0.125)2026092401
pns.dtag.de (2003:40:8000::100)2026092401
secondary004.dtag.net (195.244.245.27)2026092401
secondary004.dtag.net (2a00:fa8:3:0:100:0:4:1)2026092401

Checks

  • ✓ Serial 2026092401 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1d, retry 3h, expire 7d, negative TTL 12h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns.signal-iduna.de is one of the listed nameservers.
  • ✓ Contact dnsadmin@signal-iduna.de #25
    The SOA RNAME dnsadmin.signal-iduna.de means dnsadmin@signal-iduna.de.
  • ✓ Date-based serial #26
    The serial 2026092401 follows the YYYYMMDDnn convention (2026-09-24).

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

25 records at the apex

Found

Read from
5.183.137.35:53
TypeValueTTL
SOAns.signal-iduna.de. dnsadmin.signal-iduna.de. 2026092401 86400 10800 604800 4320086400
NSns.signal-iduna.de.86400
NSns-sec.signal-iduna.de.86400
NSpns.dtag.de.86400
NSsecondary004.dtag.net.86400
A151.101.3.1086400
A151.101.131.1086400
A151.101.67.1086400
A151.101.195.1086400
MX30 ms02.signal-iduna.de.86400
MX30 ms01.signal-iduna.de.86400
TXT"_telesec-domain-validation=357521_2026-04-08_PHJXPYp0nwtMLtxG0V6dELOMnmLc088LPrmVvVf5qzaLW0PaU0"86400
TXT"cqbbh2rdjwzj9hndx13x3nzzm9y0pv80"86400
TXT"miro-verification=d965d1f7ab52165ae6e97240bbfcf274abb5025d"86400
TXT"mongodb-site-verification=lPb3wsNtngcs7YRKReNo2RloHBBPveDe"86400
TXT"v=spf1 ip4:5.183.138.29 ip4:5.183.138.30 ip4:136.243.167.68 ip6:2a01:4f8:d0a:6244::2 ip4:5.183.138.149 ip4:5.183.138.50 ip4:84.17.184.253 ip4:5.183.138.150 ip4:5.183.139.17 " "ip4:5.183.139.18 ip4:212.99.200.114 ip4:80.82.202.182 ip4:185.98.184.0/24 ip4:80.82.206.0/26 ip4:5.183.138.92 ip4:5.183.138.93 ip4:5.183.138.94 ip4:5.183.138.95 " "include:spf.sendinblue.com include:spf.protection.outlook.com include:spf.mailjet.com include:spf.servicemail24.de include:successfactors.eu include:_spf.eu-de-1.cm.net.sap include:_spf.eu-de-2.cm.net.sap -all"86400
TXT"google-site-verification=ACefEcvN05QV1TftkUATockChgGaoO2JRdZhQ21K9vo"86400
TXT"google-site-verification=iO7xq5v-J8DnP9Gjkp7hq6Sg9M5NCpb5yMaI45vNDug"86400
TXT"3fdnglc9xlqhx3psv7w65wdhyq72dh1r"86400
TXT"google-gws-recovery-domain-verification=45629948"86400
TXT"swisssign-check=uC_B9n03NE6a3MvMcMwj0MJltLo"86400
TXT"Y2mlAOOX3lu7ipE80qfwOXYR0H7+LIQewkFMzkKl11TRFR5uBARErw0Ny2/2iNRFkoCIJmiNwcIlcF0P1ONp1w=="86400
TXT"jamf-site-verification=J52GIy0WwcuTVUnXbY4y6A"86400
TXT"D-TRUST=5A25RIKKJGYHW7T4QLNYCFW"86400
TXT"MS=ms52024886"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 1d, MX 1d, 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