psi.de

Checked 21 October 2026, 23:51 UTC · via 8.8.8.8
!Passed with warnings
20 passed 3 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

gate1.psi.de, gate2.psi.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
gate1.psi.de, gate2.psi.de
NS in the zone
gate1.psi.de, gate2.psi.de
NameserverAddressesNetwork (AS)Glue
gate1.psi.de194.115.214.187AS8220 COLT - COLT Technology Services Group Limited, GB194.115.214.187
gate2.psi.de192.109.111.186AS12312 ECOTEL - ecotel communication ag, DE192.109.111.186

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: gate1.psi.de, gate2.psi.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: gate1.psi.de, gate2.psi.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.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS12312 (ECOTEL - ecotel communication ag, DE): 1 address; AS8220 (COLT - COLT Technology Services Group Limited, GB): 1 address.
  • 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

info

2 of 2 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
gate1.psi.de 194.115.214.187NOERROR, 13 ms, authoritativenoyes / yesrefusedGreetings to CREW-RIPE
gate2.psi.de 192.109.111.186NOERROR, 6 ms, authoritativenoyes / yesrefusedyou really want to know? Send mail or call

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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: gate1.psi.de: "Greetings to CREW-RIPE"; gate2.psi.de: "you really want to know? Send mail or call".
    #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 2026100103 · primary gate1.psi.de

Found

Primary (MNAME)
gate1.psi.de
Contact (RNAME)
hostmaster.psi.de
Serial
2026100103
Refresh / retry
10800 s / 7200 s
Expire
1209600 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
gate1.psi.de (194.115.214.187)2026100103
gate2.psi.de (192.109.111.186)2026100103

Checks

  • ✓ Serial 2026100103 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 2h, expire 14d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver gate1.psi.de is one of the listed nameservers.
  • ✓ Contact hostmaster@psi.de #25
    The SOA RNAME hostmaster.psi.de means hostmaster@psi.de.
  • ✓ Date-based serial #26
    The serial 2026100103 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

warn

19 records at the apex

Found

Read from
194.115.214.187:53
TypeValueTTL
SOAgate1.psi.de. hostmaster.psi.de. 2026100103 10800 7200 1209600 8640086400
NSgate2.psi.de.86400
NSgate1.psi.de.86400
A45.144.187.425
MX0 psi-de.mail.protection.outlook.com.86400
TXT"linkedin-site-verification=d14c2193-e4af-4d41-a5ae-7008bda85fff"86400
TXT"atlassian-domain-verification=tyvR7fSvsRdlINBNDiwq4069R4Bb0ajEPKdRlqpcl1nfAdzV31cAEdXAFMLesUWJ"86400
TXT"v=spf1 ip4:194.115.214.176/28 ip4:192.109.111.186 ip4:195.138.38.9 ip4:134.119.0.238 " "include:spf.protection.outlook.com include:spf.academymaker.de include:docebosaas.com " "include:_spf.rexx-systems.com include:spf.brevo.com include:agenturserver.de " "include:usermail.zohocreator.eu include:one.zoho.eu -all"86400
TXT"brevo-code:4408a755b25e3b39fe7f68ca56ec6318"86400
TXT"domainVerification=384701a5-d862-44ec-9f8b-8b51d496327e"86400
TXT"figma-domain-verification=3add55e1e08c2b9e90e50603df3c5a171b5d1fb709aeb361462295de783b7ba6-1782731703"86400
TXT"zoho-verification=zb76477632.zmverify.zoho.eu"86400
TXT"MS=ms46999001"86400
TXT"docusign=54a9f1bc-623a-4058-b81f-bd6b0728da44"86400
TXT"cisco-ci-domain-verification=1d7878daed3f8e4305cc0174d1c4da52707e2c12dbe50b36c90ab0b38daa894a"86400
TXT"jetbrains-domain-verification=7irxtrd1dvmnc5wmv74u3gl81"86400
TXT"1password-site-verification=LUBKI5K5AVFLTFCY7HLCN5UJUA"86400
TXT"apple-domain-verification=c6Qk5YYNAVzxd38k"86400
TXT"google-site-verification=giunO09NLEDkr-L__9qKrONZGovWLTliXVO9wtichgA"86400

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (5s). Low TTLs are useful just before a planned change.
    #32
  • ✓ 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