uk-essen.de

Checked 22 October 2026, 00:50 UTC · via 8.8.8.8
!Passed with warnings
22 passed 1 warning 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

info

a.xnameserver.de, b.xnameserver.de, ns1.uk-essen.de, ns2.uk-essen.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
a.xnameserver.de, b.xnameserver.de, ns1.uk-essen.de, ns2.uk-essen.de
NS in the zone
a.xnameserver.de, b.xnameserver.de, ns1.uk-essen.de, ns2.uk-essen.de
NameserverAddressesNetwork (AS)Glue
a.xnameserver.de192.174.68.104 2001:67c:1bc::104AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT192.174.68.104 2001:67c:1bc::104
b.xnameserver.de176.97.158.104 2001:67c:10b8::104AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT176.97.158.104 2001:67c:10b8::104
ns1.uk-essen.de132.252.146.201AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE132.252.146.201
ns2.uk-essen.de132.252.146.202AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE132.252.146.202

Checks

  • ✓ 4 nameservers #6
    Delegated to a.xnameserver.de, b.xnameserver.de, ns1.uk-essen.de, ns2.uk-essen.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: ns1.uk-essen.de, ns2.uk-essen.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 2 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS1921 (RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT): 4 addresses; AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE): 2 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: ns1.uk-essen.de, ns2.uk-essen.de.
    #13

Nameservers

info

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
a.xnameserver.de 192.174.68.104NOERROR, 4 ms, authoritativenoyes / yesrefusedRcodeZero DNS
a.xnameserver.de 2001:67c:1bc::104NOERROR, 4 ms, authoritativenoyes / yesrefusedRcodeZero DNS
b.xnameserver.de 176.97.158.104NOERROR, 14 ms, authoritativenoyes / yesrefusedreg-wie1
b.xnameserver.de 2001:67c:10b8::104NOERROR, 13 ms, authoritativenoyes / yesrefusedreg-wie1
ns1.uk-essen.de 132.252.146.201NOERROR, 9 ms, authoritativenoyes / yesrefused4 8 15 16 23 42
ns2.uk-essen.de 132.252.146.202NOERROR, 9 ms, authoritativenoyes / yesrefused4 8 15 16 23 42

Checks

  • ✓ All respond #14
    All 6 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: a.xnameserver.de: "RcodeZero DNS"; b.xnameserver.de: "reg-wie1"; ns1.uk-essen.de: "4 8 15 16 23 42"; ns2.uk-essen.de: "4 8 15 16 23 42".
    #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 2026100101 · primary ns1.uk-essen.de

Found

Primary (MNAME)
ns1.uk-essen.de
Contact (RNAME)
hostmaster.uk-essen.de
Serial
2026100101
Refresh / retry
14400 s / 3600 s
Expire
604800 s
Negative TTL
43200 s

Serial per nameserver

NameserverSerial
a.xnameserver.de (192.174.68.104)2026100101
a.xnameserver.de (2001:67c:1bc::104)2026100101
b.xnameserver.de (176.97.158.104)2026100101
b.xnameserver.de (2001:67c:10b8::104)2026100101
ns1.uk-essen.de (132.252.146.201)2026100101
ns2.uk-essen.de (132.252.146.202)2026100101

Checks

  • ✓ Serial 2026100101 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 4h, retry 1h, expire 7d, negative TTL 12h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.uk-essen.de is one of the listed nameservers.
  • ✓ Contact hostmaster@uk-essen.de #25
    The SOA RNAME hostmaster.uk-essen.de means hostmaster@uk-essen.de.
  • ✓ Date-based serial #26
    The serial 2026100101 follows the YYYYMMDDnn convention (2026-10-01).

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
192.174.68.104:53
TypeValueTTL
SOAns1.uk-essen.de. hostmaster.uk-essen.de. 2026100101 14400 3600 604800 43200172800
NSa.xnameserver.de.172800
NSb.xnameserver.de.172800
NSns1.uk-essen.de.172800
NSns2.uk-essen.de.172800
A157.90.149.137172800
MX10 mx1.uk-essen.de.172800
MX10 mx2.uk-essen.de.172800
MX10 mx3.uk-essen.de.172800
MX10 mx4.uk-essen.de.172800
TXT"MS=ms85420668"172800
TXT"ZOOM_verify_y8IMnTk6hrmBHHGgG4XvOp"172800
TXT"asv=f861065bd31968f2e4e5974263068057"172800
TXT"apple-domain-verification=jNadd9MWca4VOqxq"172800
TXT"MS=A4E3739A8851434C91ED07634436752B48091F51"172800
TXT"brevo-code:6a55b4a8c2220b7f5bdebbf9196581b6"172800
TXT"Y2+cEXqsywSupjcbDEFtARHkaZXUkmDJjn8j+MSvV5vkR3b+xfY8WS+V34ORD+b8Fp6+wMpz6/qqL+KBUWZQXA=="172800
TXT"v=spf1 mx include:_spf.zimpel.de include:spf.crsend.com include:_spf.createsend.com include:spf.de.umantis.com include:spf.umantis.com include:_spf.sendnode.com ip4:88.198.122.19 ip4:49.13.13.243 -all"172800

Checks

  • ✓ TTLs within range #32
    TTLs: A 2d, MX 2d, 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