siemens.de

Checked 22 October 2026, 00:10 UTC · via 8.8.8.8
!Passed with warnings
24 passed 2 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

pass

a1-16.akam.net, a10-64.akam.net, a11-66.akam.net, a13-65.akam.net, a2-67.akam.net, a28-65.akam.net, ns1.f5cloudservices.com, ns2.f5cloudservices.com

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
a1-16.akam.net, a10-64.akam.net, a11-66.akam.net, a13-65.akam.net, a2-67.akam.net, a28-65.akam.net, ns1.f5cloudservices.com, ns2.f5cloudservices.com
NS in the zone
a1-16.akam.net, a10-64.akam.net, a11-66.akam.net, a13-65.akam.net, a2-67.akam.net, a28-65.akam.net, ns1.f5cloudservices.com, ns2.f5cloudservices.com
NameserverAddressesNetwork (AS)Glue
a1-16.akam.net193.108.91.16 2600:1401:2::10AS20940 AKAMAI-ASN1 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a10-64.akam.net96.7.50.64 2600:1480:d000::40AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a11-66.akam.net84.53.139.66 2600:1480:1::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a13-65.akam.net2.22.230.65 2600:1480:800::41AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a2-67.akam.net95.100.174.67 2600:1480:7000::43AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a28-65.akam.net95.100.173.65 2600:1480:d800::41AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
ns1.f5cloudservices.com107.162.234.197 2604:e180:1071::3:1AS55002 DEFENSE-NET - F5, Inc., US AS55002 DEFENSE-NET - F5, Inc., US-
ns2.f5cloudservices.com107.162.176.221 2604:e180:1071::ffff:6ba2:b0ddAS55002 DEFENSE-NET - F5, Inc., US AS55002 DEFENSE-NET - F5, Inc., US-

Checks

  • ✓ 8 nameservers #6
    Delegated to a1-16.akam.net, a10-64.akam.net, a11-66.akam.net, a13-65.akam.net, a2-67.akam.net, a28-65.akam.net, ns1.f5cloudservices.com, ns2.f5cloudservices.com.
  • ✓ 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 8 IPv4 /24s and 7 IPv6 /48s.
  • ✓ 3 autonomous systems #11
    The nameservers are spread over: AS20940 (AKAMAI-ASN1 - Akamai International B.V., NL): 1 address; AS21342 (AKAMAI-ASN2 - Akamai International B.V., NL): 11 addresses; AS55002 (DEFENSE-NET - F5, Inc., US): 4 addresses.
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .com, .net.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

warn

16 of 16 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
a1-16.akam.net 193.108.91.16NOERROR, 3 ms, authoritativenoyes / yesrefused41824.4
a1-16.akam.net 2600:1401:2::10NOERROR, 4 ms, authoritativenoyes / yesrefused41824.6
a10-64.akam.net 96.7.50.64NOERROR, 3 ms, authoritativenoyes / yesrefused48878.31
a10-64.akam.net 2600:1480:d000::40NOERROR, 4 ms, authoritativenoyes / yesrefused48878.29
a11-66.akam.net 84.53.139.66NOERROR, 3 ms, authoritativenoyes / yesrefused41824.10
a11-66.akam.net 2600:1480:1::42NOERROR, 4 ms, authoritativenoyes / yesrefused41824.6
a13-65.akam.net 2.22.230.65NOERROR, 5 ms, authoritativenoyes / yesrefused41824.7
a13-65.akam.net 2600:1480:800::41NOERROR, 4 ms, authoritativenoyes / yesrefused41824.9
a2-67.akam.net 95.100.174.67NOERROR, 3 ms, authoritativenoyes / yesrefused48878.26
a2-67.akam.net 2600:1480:7000::43NOERROR, 4 ms, authoritativenoyes / yesrefused48878.33
a28-65.akam.net 95.100.173.65NOERROR, 3 ms, authoritativenoyes / yesrefused48878.31
a28-65.akam.net 2600:1480:d800::41NOERROR, 4 ms, authoritativenoyes / yesrefused48878.31
ns1.f5cloudservices.com 107.162.234.197NOERROR, 15 ms, authoritativenoyes / yesrefused-
ns1.f5cloudservices.com 2604:e180:1071::3:1NOERROR, 164 ms, authoritativenoyes / yesrefused-
ns2.f5cloudservices.com 107.162.176.221NOERROR, 12 ms, authoritativenoyes / yesrefused-
ns2.f5cloudservices.com 2604:e180:1071::ffff:6ba2:b0ddNOERROR, 23 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 16 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: a1-16.akam.net: "41824.4"; a1-16.akam.net: "41824.6"; a10-64.akam.net: "48878.31"; a10-64.akam.net: "48878.29"; a11-66.akam.net: "41824.10"; a11-66.akam.net: "41824.6"; a13-65.akam.net: "41824.7"; a13-65.akam.net: "41824.9"; a2-67.akam.net: "48878.26"; a2-67.akam.net: "48878.33"; a28-65.akam.net: "48878.31". 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 2026102117 · primary a1-16.akam.net

Found

Primary (MNAME)
a1-16.akam.net
Contact (RNAME)
hostmaster.siemens.com
Serial
2026102117
Refresh / retry
3600 s / 600 s
Expire
604800 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
a1-16.akam.net (193.108.91.16)2026102117
a1-16.akam.net (2600:1401:2::10)2026102117
a10-64.akam.net (96.7.50.64)2026102117
a10-64.akam.net (2600:1480:d000::40)2026102117
a11-66.akam.net (84.53.139.66)2026102117
a11-66.akam.net (2600:1480:1::42)2026102117
a13-65.akam.net (2.22.230.65)2026102117
a13-65.akam.net (2600:1480:800::41)2026102117
a2-67.akam.net (95.100.174.67)2026102117
a2-67.akam.net (2600:1480:7000::43)2026102117
a28-65.akam.net (95.100.173.65)2026102117
a28-65.akam.net (2600:1480:d800::41)2026102117
ns1.f5cloudservices.com (107.162.234.197)2026102117
ns1.f5cloudservices.com (2604:e180:1071::3:1)2026102117
ns2.f5cloudservices.com (107.162.176.221)2026102117
ns2.f5cloudservices.com (2604:e180:1071::ffff:6ba2:b0dd)2026102117

Checks

  • ✓ Serial 2026102117 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1h, retry 10m, expire 7d, negative TTL 5m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver a1-16.akam.net is one of the listed nameservers.
  • ✓ Contact hostmaster@siemens.com #25
    The SOA RNAME hostmaster.siemens.com means hostmaster@siemens.com.
  • ✓ Date-based serial #26
    The serial 2026102117 follows the YYYYMMDDnn convention (2026-10-21).

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
193.108.91.16:53
TypeValueTTL
SOAa1-16.akam.net. hostmaster.siemens.com. 2026102117 3600 600 604800 300300
NSa28-65.akam.net.300
NSa11-66.akam.net.300
NSa2-67.akam.net.300
NSa13-65.akam.net.300
NSns1.f5cloudservices.com.300
NSa1-16.akam.net.300
NSa10-64.akam.net.300
NSns2.f5cloudservices.com.300
A75.2.23.197300
A99.83.253.123300
TXT"v=spf1 -all"300
TXT"MS=ms35647779"300
TXT"vfCYWG3t7+BFlXRdz2uVL/KOjK7FlO9XvzXoYUVAQr3jr1yeSBtlEThD+3s7WIDnMDtbPYxNx4KBQd2WklI0cw=="300
TXT"UGB1HgiDq2zxxakfWxkhRnUa3ps80ndhMpvyjz+KZeaMO/blPadvqSk2jN1VgAX+rtz5FuZnwhbXV9R0lMeH5Q=="300
TXT"apple-domain-verification=B6zInkqUvZXleUpI"300
TXT"google-site-verification=SoZROX3SGoBI8aXI0cM83NcW_G6ScilHQFYzokozmcY"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 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