embl.de

Checked 21 October 2026, 22:18 UTC · via 8.8.8.8
!Passed with warnings
22 passed 2 warnings 0 failed 5 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

dns-3.dfn.de, dns1.belwue.de, dns1.embl.de, dns2-vm.embl.de, dns2.embl.de, dns3.belwue.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns-3.dfn.de, dns1.belwue.de, dns1.embl.de, dns2-vm.embl.de, dns2.embl.de, dns3.belwue.de
NS in the zone
dns-3.dfn.de, dns1.belwue.de, dns1.embl.de, dns2-vm.embl.de, dns2.embl.de, dns3.belwue.de
NameserverAddressesNetwork (AS)Glue
dns-3.dfn.de193.174.75.58 2001:638:d:b103::1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
dns1.belwue.de129.143.2.10 2001:7c0::53:10AS553 BELWUE - Universitaet Stuttgart, DE AS553 BELWUE - Universitaet Stuttgart, DE129.143.2.10 2001:7c0::53:10
dns1.embl.de192.54.41.33AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE192.54.41.33
dns2-vm.embl.de194.94.44.45AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE194.94.44.45
dns2.embl.de192.54.41.96AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE192.54.41.96
dns3.belwue.de129.143.253.133 2001:7c0:0:253::133AS553 BELWUE - Universitaet Stuttgart, DE AS553 BELWUE - Universitaet Stuttgart, DE129.143.253.133 2001:7c0:0:253::133

Checks

  • ✓ 6 nameservers #6
    Delegated to dns-3.dfn.de, dns1.belwue.de, dns1.embl.de, dns2-vm.embl.de, dns2.embl.de, dns3.belwue.de.
  • ✓ 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: dns1.embl.de, dns2-vm.embl.de, dns2.embl.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 5 IPv4 /24s and 2 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS553 (BELWUE - Universitaet Stuttgart, DE): 4 addresses; AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE): 5 addresses.
  • i
    All nameserver names under .de
    All nameserver names are under one TLD, so a problem with that TLD also makes the nameservers unreachable. Some operators use names under two TLDs for extra resilience.
    #12
  • i
    Partly IPv6
    These nameservers have no IPv6 address: dns1.embl.de, dns2-vm.embl.de, dns2.embl.de.
    #13

Nameservers

warn

9 of 9 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns-3.dfn.de 193.174.75.58NOERROR, 10 ms, authoritativenoyes / yesrefused0
dns-3.dfn.de 2001:638:d:b103::1NOERROR, 10 ms, authoritativenoyes / yesrefused0
dns1.belwue.de 129.143.2.10NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)
dns1.belwue.de 2001:7c0::53:10NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)
dns1.embl.de 192.54.41.33NOERROR, 5 ms, authoritativenoyes / yesrefusedSurely you must be joking
dns2-vm.embl.de 194.94.44.45NOERROR, 5 ms, authoritativenoyes / yesrefusedSurely you must be joking
dns2.embl.de 192.54.41.96NOERROR, 5 ms, authoritativenoyes / yesrefusedSurely you must be joking
dns3.belwue.de 129.143.253.133NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)
dns3.belwue.de 2001:7c0:0:253::133NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)

Checks

  • ✓ All respond #14
    All 9 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.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: dns1.belwue.de: "PowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)"; dns3.belwue.de: "PowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)". Hide or replace the version string.
    #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 2002121783 · primary dns1.embl.de

Found

Primary (MNAME)
dns1.embl.de
Contact (RNAME)
hostmaster.embl-heidelberg.de
Serial
2002121783
Refresh / retry
10800 s / 1800 s
Expire
3600000 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
dns-3.dfn.de (193.174.75.58)2002121783
dns-3.dfn.de (2001:638:d:b103::1)2002121783
dns1.belwue.de (129.143.2.10)2002121783
dns1.belwue.de (2001:7c0::53:10)2002121783
dns1.embl.de (192.54.41.33)2002121783
dns2-vm.embl.de (194.94.44.45)2002121783
dns2.embl.de (192.54.41.96)2002121783
dns3.belwue.de (129.143.253.133)2002121783
dns3.belwue.de (2001:7c0:0:253::133)2002121783

Checks

  • ✓ Serial 2002121783 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 30m, expire 1000h, negative TTL 5m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver dns1.embl.de is one of the listed nameservers.
  • ✓ Contact hostmaster@embl-heidelberg.de #25
    The SOA RNAME hostmaster.embl-heidelberg.de means hostmaster@embl-heidelberg.de.
  • ✓ Date-based serial #26
    The serial 2002121783 follows the YYYYMMDDnn convention (2002-12-17).

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

17 records at the apex

Found

Read from
193.174.75.58:53
TypeValueTTL
SOAdns1.embl.de. hostmaster.EMBL-Heidelberg.de. 2002121783 10800 1800 3600000 300300
NSdns2-vm.embl.de.300
NSdns1.belwue.de.300
NSdns3.belwue.de.300
NSdns1.embl.de.300
NSdns2.embl.de.300
NSdns-3.dfn.de.300
A194.94.45.80300
MX10 ironport1.embl.de.300
MX10 ironport2.embl.de.300
TXT"asv=4c5a999746f4a3d67b75fa4249fa641a"300
TXT"apple-domain-verification=TPei9nSnwiJxaelp"300
TXT"google-site-verification=OF45kDResAhYyqSMnFXYPFr6hBx700rH_P9hBuoYzbM"300
TXT"MS=ms84722020"300
TXT"google-site-verification=TsWjrDlfObpTiIpe09_OWkjX1p6Evd12yEXGLxhI0Hw"300
TXT"v=spf1 mx ip4:194.94.47.133 ip4:87.106.79.127 include:_spf.google.com -all"300
TXT"openai-domain-verification=dv-MHFRjU96zlPqH5mRgWx80jWA"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 5m, NS 5m. The NS TTL at the parent is 1d and in the zone 5m; 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