richter-frenzel.de

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

info

ns1.r-f.de, ns5.fis-asp.de, pns.dtag.de, secondary006.dtag.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns1.r-f.de, ns5.fis-asp.de, pns.dtag.de, secondary006.dtag.net
NS in the zone
ns1.r-f.de, ns5.fis-asp.de, pns.dtag.de, secondary006.dtag.net
NameserverAddressesNetwork (AS)Glue
ns1.r-f.de93.122.75.10AS48951 ASN-TSI-IAS - Telekom Deutschland GmbH, DE93.122.75.10
ns5.fis-asp.de194.15.137.5AS205496 FISASP - FIS-ASP Application Service Providing & IT-Outsourcing GmbH, DE194.15.137.5
pns.dtag.de194.25.0.125 2003:40:8000::100AS3320 DTAG - Deutsche Telekom AG, DE AS3320 DTAG - Deutsche Telekom AG, DE194.25.0.125 2003:40:8000::100
secondary006.dtag.net195.244.245.25 2a00:fa8:3:0:100:0:6:1AS5605 NETUSE - NetUSE AG, DE AS5605 NETUSE - NetUSE AG, DE-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns1.r-f.de, ns5.fis-asp.de, pns.dtag.de, secondary006.dtag.net.
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • ✓ No glue needed #8
    All nameservers are outside the zone, so no glue records are needed.
  • ✓ 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 4 IPv4 /24s and 2 IPv6 /48s.
  • ✓ 4 autonomous systems #11
    The nameservers are spread over: AS205496 (FISASP - FIS-ASP Application Service Providing & IT-Outsourcing GmbH, DE): 1 address; AS3320 (DTAG - Deutsche Telekom AG, DE): 2 addresses; AS48951 (ASN-TSI-IAS - Telekom Deutschland GmbH, DE): 1 address; AS5605 (NETUSE - NetUSE AG, DE): 2 addresses.
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .de, .net.
  • i
    Partly IPv6
    These nameservers have no IPv6 address: ns1.r-f.de, ns5.fis-asp.de.
    #13

Nameservers

info

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.r-f.de 93.122.75.10NOERROR, 68 ms, authoritativenoyes / yesrefused-
ns5.fis-asp.de 194.15.137.5NOERROR, 8 ms, authoritativenoyes / yesrefused-
pns.dtag.de 194.25.0.125NOERROR, 9 ms, authoritativenoyes / yesrefusedDomainNameServer
pns.dtag.de 2003:40:8000::100NOERROR, 7 ms, authoritativenoyes / yesrefusedDomainNameServer
secondary006.dtag.net 195.244.245.25NOERROR, 12 ms, authoritativenoyes / yesrefusedDomainNameServer
secondary006.dtag.net 2a00:fa8:3:0:100:0:6:1NOERROR, 16 ms, authoritativenoyes / yesrefusedDomainNameServer

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: pns.dtag.de: "DomainNameServer"; secondary006.dtag.net: "DomainNameServer".
    #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 2026102101 · primary ns1.r-f.de

Found

Primary (MNAME)
ns1.r-f.de
Contact (RNAME)
hostmaster.r-f.de
Serial
2026102101
Refresh / retry
86400 s / 10800 s
Expire
3600000 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns1.r-f.de (93.122.75.10)2026102101
ns5.fis-asp.de (194.15.137.5)2026102101
pns.dtag.de (194.25.0.125)2026102101
pns.dtag.de (2003:40:8000::100)2026102101
secondary006.dtag.net (195.244.245.25)2026102101
secondary006.dtag.net (2a00:fa8:3:0:100:0:6:1)2026102101

Checks

  • ✓ Serial 2026102101 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1d, retry 3h, expire 1000h, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.r-f.de is one of the listed nameservers.
  • ✓ Contact hostmaster@r-f.de #25
    The SOA RNAME hostmaster.r-f.de means hostmaster@r-f.de.
  • ✓ Date-based serial #26
    The serial 2026102101 follows the YYYYMMDDnn convention (2026-10-21).

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

12 records at the apex

Found

Read from
93.122.75.10:53
TypeValueTTL
SOAns1.r-f.de. hostmaster.r-f.de. 2026102101 86400 10800 3600000 864003600
NSns5.fis-asp.de.3600
NSns1.r-f.de.3600
NSsecondary006.dtag.net.3600
NSpns.dtag.de.3600
A93.122.75.583600
MX5 mail-1.r-f.de.3600
TXT"apple-domain-verification=KBj2GRxikFNVmoeY"3600
TXT"atlassian-domain-verification=gSuQZP4aaaBudYwb1QNxO1Pr8Q1oV6gTUoUB8nb8DwF2scaaC/NvKEm1XMrZpcJU"3600
TXT"MS=ms33390822"3600
TXT"v=spf1 include:spf.r-f-de.cloud.nospamproxy.com ip4:93.122.75.0/26 include:spf.protection.outlook.com include:spf.go-2b-planer.de -all"3600
TXT"google-site-verification=6ygUQ1NZM8MD56xzjDWxvWIi12mW-LXqhJO5Q6ybn_0"3600

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