vrn.de

Checked 22 October 2026, 01:00 UTC · via 8.8.8.8
!Passed with warnings
20 passed 2 warnings 0 failed 7 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

ns.vrn.de, ns1.arcor-ip.de, ns2.arcor-ip.de, ns3.arcor-ip.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns.vrn.de, ns1.arcor-ip.de, ns2.arcor-ip.de, ns3.arcor-ip.de
NS in the zone
ns.vrn.de, ns1.arcor-ip.de, ns2.arcor-ip.de, ns3.arcor-ip.de
NameserverAddressesNetwork (AS)Glue
ns.vrn.de145.253.183.21AS3209 VODANET - Vodafone GmbH, DE145.253.183.21
ns1.arcor-ip.de145.253.2.144 2a01:860:0:202::53AS3209 VODANET - Vodafone GmbH, DE AS3209 VODANET - Vodafone GmbH, DE145.253.2.144 2a01:860:0:202::53
ns2.arcor-ip.de145.253.3.16 2a01:860:0:203::53AS3209 VODANET - Vodafone GmbH, DE AS3209 VODANET - Vodafone GmbH, DE145.253.3.16 2a01:860:0:203::53
ns3.arcor-ip.de145.253.3.20 2a01:860:0:204::53AS3209 VODANET - Vodafone GmbH, DE AS3209 VODANET - Vodafone GmbH, DE145.253.3.20 2a01:860:0:204::53

Checks

  • ✓ 4 nameservers #6
    Delegated to ns.vrn.de, ns1.arcor-ip.de, ns2.arcor-ip.de, ns3.arcor-ip.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: ns.vrn.de.
  • ✓ All names resolve #9
    Every nameserver name has an address and is not an alias.
  • i
    One address family in one network
    all IPv6 addresses are in 2a01:860::/48, while the other address family is spread over several networks.
    #10
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS3209 (VODANET - Vodafone GmbH, DE): 7 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
  • i
    Partly IPv6
    These nameservers have no IPv6 address: ns.vrn.de.
    #13

Nameservers

warn

7 of 7 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns.vrn.de 145.253.183.21NOERROR, 11 ms, authoritativenoyes / yesrefused9.16.23-RH
ns1.arcor-ip.de 145.253.2.144NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns1.arcor-ip.de 2a01:860:0:202::53NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns2.arcor-ip.de 145.253.3.16NOERROR, 12 ms, authoritativenoyes / yesrefused-
ns2.arcor-ip.de 2a01:860:0:203::53NOERROR, 14 ms, authoritativenoyes / yesrefused-
ns3.arcor-ip.de 145.253.3.20NOERROR, 10 ms, authoritativenoyes / yesrefused-
ns3.arcor-ip.de 2a01:860:0:204::53NOERROR, 10 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 7 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: ns.vrn.de: "9.16.23-RH". 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 2026092201 · primary ns.vrn.de

Found

Primary (MNAME)
ns.vrn.de
Contact (RNAME)
postmaster.vrn.de
Serial
2026092201
Refresh / retry
10800 s / 1800 s
Expire
604800 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
ns.vrn.de (145.253.183.21)2026092201
ns1.arcor-ip.de (145.253.2.144)2026092201
ns1.arcor-ip.de (2a01:860:0:202::53)2026092201
ns2.arcor-ip.de (145.253.3.16)2026092201
ns2.arcor-ip.de (2a01:860:0:203::53)2026092201
ns3.arcor-ip.de (145.253.3.20)2026092201
ns3.arcor-ip.de (2a01:860:0:204::53)2026092201

Checks

  • ✓ Serial 2026092201 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 30m, expire 7d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns.vrn.de is one of the listed nameservers.
  • ✓ Contact postmaster@vrn.de #25
    The SOA RNAME postmaster.vrn.de means postmaster@vrn.de.
  • ✓ Date-based serial #26
    The serial 2026092201 follows the YYYYMMDDnn convention (2026-09-22).

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

15 records at the apex

Found

Read from
145.253.183.21:53
TypeValueTTL
SOAns.vrn.de. postmaster.vrn.de. 2026092201 10800 1800 604800 36003600
NSns.vrn.de.3600
NSns1.arcor-ip.de.3600
NSns2.arcor-ip.de.3600
NSns3.arcor-ip.de.3600
A145.253.183.383600
MX30 mx03.hornetsecurity.com.3600
MX20 mx02.hornetsecurity.com.3600
MX10 mx01.hornetsecurity.com.3600
MX40 mx04.hornetsecurity.com.3600
TXT"google-site-verification=A5r5yD10cRbLYraVTbI1iZTlSCMTHUhk8vQywvuykRo"86400
TXT"v=spf1 a:mail.vrn.de a:mail-intra.vrn.de include:spf.protection.outlook.com include:spf.hornetsecurity.com -all"86400
TXT"atlassian-domain-verification=Qg5KOA6U5GsNPaIYS6kzEdHRV4HplCAh97D0YWkB52DYEIwMBR9iMMwHmSfMhSEb"86400
TXT"atlassian-sending-domain-verification=96f2f6a8-c4f6-4880-aa53-c2f9048875bc"86400
TXT"apple-domain-verification=j7UiMuteob4dxhDF"86400

Checks

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