usk.de

Checked 22 October 2026, 00:50 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

ns1.bdm.microsoftonline.com, ns2.bdm.microsoftonline.com, ns3.bdm.microsoftonline.com, ns4.bdm.microsoftonline.com

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns1.bdm.microsoftonline.com, ns2.bdm.microsoftonline.com, ns3.bdm.microsoftonline.com, ns4.bdm.microsoftonline.com
NS in the zone
ns1.bdm.microsoftonline.com, ns2.bdm.microsoftonline.com, ns3.bdm.microsoftonline.com, ns4.bdm.microsoftonline.com
NameserverAddressesNetwork (AS)Glue
ns1.bdm.microsoftonline.com13.107.236.208 2603:1061:0:700::d0AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US-
ns2.bdm.microsoftonline.com150.171.21.208 2620:1ec:8ec:700::d0AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US-
ns3.bdm.microsoftonline.com204.14.183.208 2a01:111:4000:700::d0AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US-
ns4.bdm.microsoftonline.com208.84.5.208 2620:1ec:bda:700::d0AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns1.bdm.microsoftonline.com, ns2.bdm.microsoftonline.com, ns3.bdm.microsoftonline.com, ns4.bdm.microsoftonline.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 4 IPv4 /24s and 4 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS8075 (MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US): 8 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.
    #11
  • i
    All nameserver names under .com
    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
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

warn

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.bdm.microsoftonline.com 13.107.236.208NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns1.bdm.microsoftonline.com 2603:1061:0:700::d0NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns2.bdm.microsoftonline.com 150.171.21.208NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns2.bdm.microsoftonline.com 2620:1ec:8ec:700::d0NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns3.bdm.microsoftonline.com 204.14.183.208NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns3.bdm.microsoftonline.com 2a01:111:4000:700::d0NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns4.bdm.microsoftonline.com 208.84.5.208NOERROR, 4 ms, authoritativenoyes / yesrefusedKnot DNS 3.1.2.1770717641.d6b376aff
ns4.bdm.microsoftonline.com 2620:1ec:bda:700::d0NOERROR, 4 ms, authoritativenoyes / yesrefused-

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.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: ns4.bdm.microsoftonline.com: "Knot DNS 3.1.2.1770717641.d6b376aff". 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 1 · primary ns1.bdm.microsoftonline.com

Found

Primary (MNAME)
ns1.bdm.microsoftonline.com
Contact (RNAME)
azuredns-hostmaster.microsoft.com
Serial
1
Refresh / retry
3600 s / 300 s
Expire
2419200 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
ns1.bdm.microsoftonline.com (13.107.236.208)1
ns1.bdm.microsoftonline.com (2603:1061:0:700::d0)1
ns2.bdm.microsoftonline.com (150.171.21.208)1
ns2.bdm.microsoftonline.com (2620:1ec:8ec:700::d0)1
ns3.bdm.microsoftonline.com (204.14.183.208)1
ns3.bdm.microsoftonline.com (2a01:111:4000:700::d0)1
ns4.bdm.microsoftonline.com (208.84.5.208)1
ns4.bdm.microsoftonline.com (2620:1ec:bda:700::d0)1

Checks

  • ✓ Serial 1 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1h, retry 5m, expire 28d, negative TTL 5m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.bdm.microsoftonline.com is one of the listed nameservers.
  • ✓ Contact azuredns-hostmaster@microsoft.com #25
    The SOA RNAME azuredns-hostmaster.microsoft.com means azuredns-hostmaster@microsoft.com.
  • ✓ Counter serial #26
    The serial 1 is a plain counter.

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

18 records at the apex

Found

Read from
13.107.236.208:53
TypeValueTTL
SOAns1.bdm.microsoftonline.com. azuredns-hostmaster.microsoft.com. 1 3600 300 2419200 3003600
NSns1.bdm.microsoftonline.com.172800
NSns2.bdm.microsoftonline.com.172800
NSns3.bdm.microsoftonline.com.172800
NSns4.bdm.microsoftonline.com.172800
A176.52.243.2541800
MX0 usk-de.mail.protection.outlook.com.3600
TXT"mscid=7aq7+iOBa8W8Fw3KeAaCDv3UdIsXYKVdPzSoX9ncrF0Pn3irEjMZclGIvHuuidgGdDASr7R5LzoLf6cbBNnLWA=="1800
TXT"v=spf1 include:spf.protection.outlook.com ip4:80.156.28.70 include:spf.mtasv.net include:spf.brevo.com -all"1800
TXT"MS=D7E7C0EF42CB1D868C1033C40C2FB31764F77256"1800
TXT"MS=ms56495379"1800
TXT"brevo-code:9dde805e8810f0e0a29597cebedc6bb9"1800
TXT"google-site-verification=mFU3NS8Hu59QOrMxt4gWAGu9jdZTEfI3ik7HsyZjQI4"1800
TXT"k=rsa;p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCmRarDnm8s2nXsyiS5nfC5eWCzW/dVfM7TRKEjVDlBq/QlKe8wdH4SPUgV0SO4Ppzkpm0twv5Pw+qhdnqdATasHOsd+VzDJbOyR4PTK2L3DK2zA/OeXGlfj4EDSJ5jNWO/JJC4mVmIg3HyNckI00i2k62xLXKEBdYeF/jMGe4f6QIDAQAB"1800
TXT"v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC0a1phfSD3cvoxbQSid3f5YWTgNnRwVWDwEztZXAubbOOPj6FRMCSPtZlxQD45BAiSe5sjEw5xiNMTgqR0GMyQuNso02H1mGFqjcXopjyQ2MHiFZhcp1WLZobt5tFNVHLRN4qGXTUcs2rNf7vYVIYoUoQWLGSfe50FmnH4dCVW2wIDAQAB"1800
TXT"v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDGwOsM1+SbgM6KK6OpvgrfXP7mHe2QnqKLFCsOC+GAXpqIZYZS2Sz5c9kBOuH2oxAD2ilhnFy8xzoNn79R08L9XXO/rpX9mzDhzO+Gc4biJGOBtRk+izPqyonqJD8jpVkNsypfUIOQ4132tsONYPka0++wsWzTN2v/E3gPSxfxjwIDAQAB"1800
TXT"v=DKIM1;k=rsa;p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDeMVIzrCa3T14JsNY0IRv5/2V1/v2itlviLQBwXsa7shBD6TrBkswsFUToPyMRWC9tbR/5ey0nRBH0ZVxp+lsmTxid2Y2z+FApQ6ra2VsXfbJP3HE6wAO0YTVEJt1TmeczhEd2Jiz/fcabIISgXEdSpTYJhb0ct0VJRxcg4c8c7wIDAQAB"1800
TXT"v=DMARC1; p=none; rua=mailto:rua@dmarc.brevo.com"1800

Checks

  • ✓ TTLs within range #32
    TTLs: A 30m, MX 1h, NS 2d. The NS TTL at the parent is 1d and in the zone 2d; 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