pei.de

Checked 21 October 2026, 23:42 UTC · via 8.8.8.8
!Passed with warnings
20 passed 4 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

warn

sv-avw-02.pei.de, sv-spam-01.pei.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
sv-avw-02.pei.de, sv-spam-01.pei.de
NS in the zone
sv-avw-02.pei.de, sv-spam-01.pei.de
NameserverAddressesNetwork (AS)Glue
sv-avw-02.pei.de91.209.250.66AS39380 PEI - Paul-Ehrlich-Institut, DE91.209.250.66
sv-spam-01.pei.de91.209.250.65AS39380 PEI - Paul-Ehrlich-Institut, DE91.209.250.65

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: sv-avw-02.pei.de, sv-spam-01.pei.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: sv-avw-02.pei.de, sv-spam-01.pei.de.
  • ✓ All names resolve #9
    Every nameserver name has an address and is not an alias.
  • !
    Nameservers in one network
    all IPv4 addresses are in 91.209.250.0/24. A single network failure takes all nameservers down; RFC 2182 recommends topologically separate networks (anycast setups are an exception).
    #10
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS39380 (PEI - Paul-Ehrlich-Institut, 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

warn

2 of 2 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
sv-avw-02.pei.de 91.209.250.66NOERROR, 7 ms, authoritativenoyes / yesrefused9.20.26
sv-spam-01.pei.de 91.209.250.65NOERROR, 7 ms, authoritativenoyes / yesrefused9.11.22

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.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: sv-avw-02.pei.de: "9.20.26"; sv-spam-01.pei.de: "9.11.22". 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 2026091501 · primary sv-spam-01.pei.de

Found

Primary (MNAME)
sv-spam-01.pei.de
Contact (RNAME)
hostmaster.pei.de
Serial
2026091501
Refresh / retry
21600 s / 3600 s
Expire
1209600 s
Negative TTL
7200 s

Serial per nameserver

NameserverSerial
sv-avw-02.pei.de (91.209.250.66)2026091501
sv-spam-01.pei.de (91.209.250.65)2026091501

Checks

  • ✓ Serial 2026091501 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 6h, retry 1h, expire 14d, negative TTL 2h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver sv-spam-01.pei.de is one of the listed nameservers.
  • ✓ Contact hostmaster@pei.de #25
    The SOA RNAME hostmaster.pei.de means hostmaster@pei.de.
  • ✓ Date-based serial #26
    The serial 2026091501 follows the YYYYMMDDnn convention (2026-09-15).

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

pass

15 records at the apex

Found

Read from
91.209.250.66:53
TypeValueTTL
SOAsv-spam-01.pei.de. hostmaster.pei.de. 2026091501 21600 3600 1209600 720086400
NSsv-spam-01.pei.de.86400
NSsv-avw-02.pei.de.86400
A80.245.144.20786400
MX10 sv-spam-01.pei.de.86400
MX20 sv-avw-02.pei.de.86400
TXT"D-TRUST=O6IFZADMS2SL4D4OUG7D2WJ"86400
TXT"v=spf1 mx ip4:77.87.229.56 ip4:194.153.219.81 ip4:194.153.219.82 ip4:195.127.36.225 ip4:195.127.237.225 include:_spf.rexx-suite.com -all"86400
CAA0 issue "comodoca.com"86400
CAA0 issue "digicert.com"86400
CAA0 issue "telesec.de"86400
CAA0 issue "pki.dfn.de"86400
CAA0 issue "d-trust.net"86400
CAA0 issuewild "telesec.de"86400
CAA0 issue "letsencrypt.org"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 1d, MX 1d, 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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: comodoca.com, digicert.com, telesec.de, pki.dfn.de, d-trust.net, letsencrypt.org.