swd-ag.de

Checked 22 October 2026, 00:31 UTC · via 8.8.8.8
!Passed with warnings
21 passed 2 warnings 0 failed 6 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

svdmz16.swd-ag.de, svdmz17.swd-ag.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
svdmz16.swd-ag.de, svdmz17.swd-ag.de
NS in the zone
svdmz16.swd-ag.de, svdmz17.swd-ag.de
NameserverAddressesNetwork (AS)Glue
svdmz16.swd-ag.de194.59.48.200AS208606 swd - Stadtwerke Duesseldorf AG, DE194.59.48.200
svdmz17.swd-ag.de194.59.51.200AS208606 swd - Stadtwerke Duesseldorf AG, DE194.59.51.200

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: svdmz16.swd-ag.de, svdmz17.swd-ag.de.
    #6
  • ✓ 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: svdmz16.swd-ag.de, svdmz17.swd-ag.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 2 IPv4 /24s and 0 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS208606 (swd - Stadtwerke Duesseldorf AG, DE): 2 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 .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
  • !
    No IPv6
    None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.
    #13

Nameservers

pass

2 of 2 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
svdmz16.swd-ag.de 194.59.48.200NOERROR, 8 ms, authoritativenoyes / yesrefused-
svdmz17.swd-ag.de 194.59.51.200NOERROR, 7 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 2 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

pass

serial 2011072190 · primary svdmz16.swd-ag.de

Found

Primary (MNAME)
svdmz16.swd-ag.de
Contact (RNAME)
hostmaster.swd-ag.de
Serial
2011072190
Refresh / retry
3600 s / 600 s
Expire
1209600 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
svdmz16.swd-ag.de (194.59.48.200)2011072190
svdmz17.swd-ag.de (194.59.51.200)2011072190

Checks

  • ✓ Serial 2011072190 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1h, retry 10m, expire 14d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver svdmz16.swd-ag.de is one of the listed nameservers.
  • ✓ Contact hostmaster@swd-ag.de #25
    The SOA RNAME hostmaster.swd-ag.de means hostmaster@swd-ag.de.
  • ✓ Date-based serial #26
    The serial 2011072190 follows the YYYYMMDDnn convention (2011-07-21).

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

13 records at the apex

Found

Read from
194.59.48.200:53
TypeValueTTL
SOAsvdmz16.swd-ag.de. hostmaster.swd-ag.de. 2011072190 3600 600 1209600 8640086400
NSsvdmz16.swd-ag.de.86400
NSsvdmz17.swd-ag.de.86400
A194.59.48.2486400
MX10 swd-ag-de.mail.cloud.nospamproxy.com.3600
TXT"google-site-verification=VLTU3O0H8hXHq15kTqBeNc7bwYsOIbgcW5kNpYgvoJ4"86400
TXT"globalsign-domain-verification=4F23293B788CBF710CDD875C7BAA2037"86400
TXT"25reports=0494fc1cc6586f69f2b439fd"86400
TXT"v=spf1 a:mx01.swd-ag.de a:mx02.swd-ag.de a:mx03.swd-ag.de a:mx04.swd-ag.de include:spf.protection.outlook.com include:spf.swd-ag-de.cloud.nospamproxy.com -all"600
TXT"atlassian-domain-verification=wqddqAso4lPGSyQAY51eSDQFRnk6S6ppW7uRPK7W8MAV4BU50WAOYO3fXziQdPyT"86400
TXT"_telesec-domain-validation=348229_2026-03-12_kdAvbXSantjlo9RMB5BVB3CwReyHqgPbx7I0zxzsTNFgZijOFS"86400
TXT"autodesk-domain-verification=8T_DQI9BnYYzK0jq3t7_"86400
TXT"adobe-idp-site-verification=944a1816c2b3c66eb9ce494ae3395efcb1c30efca33761a60157d4ba8bced23e"86400

Checks

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