frankfurt.de

Checked 21 October 2026, 22:31 UTC · via 8.8.8.8
!Passed with warnings
22 passed 2 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

ns.stadt-frankfurt.de, ns2.stadt-frankfurt.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns.stadt-frankfurt.de, ns2.stadt-frankfurt.de
NS in the zone
ns.stadt-frankfurt.de, ns2.stadt-frankfurt.de
NameserverAddressesNetwork (AS)Glue
ns.stadt-frankfurt.de62.96.234.1AS8220 COLT - COLT Technology Services Group Limited, GB62.96.234.1
ns2.stadt-frankfurt.de192.76.161.1AS15404 UNSPECIFIED - COLT Technology Services Group Limited, GB192.76.161.1

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns.stadt-frankfurt.de, ns2.stadt-frankfurt.de.
    #6
  • ✓ 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 2 IPv4 /24s and 0 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS15404 (UNSPECIFIED - COLT Technology Services Group Limited, GB): 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
ns.stadt-frankfurt.de 62.96.234.1NOERROR, 4 ms, authoritativenoyes / yesrefusedNot Available
ns2.stadt-frankfurt.de 192.76.161.1NOERROR, 4 ms, authoritativenoyes / yesrefusedNot Available

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: ns.stadt-frankfurt.de: "Not Available"; ns2.stadt-frankfurt.de: "Not Available".
    #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 2026100702 · primary ns.stadt-frankfurt.de

Found

Primary (MNAME)
ns.stadt-frankfurt.de
Contact (RNAME)
hostmaster.stadt-frankfurt.de
Serial
2026100702
Refresh / retry
28800 s / 7200 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns.stadt-frankfurt.de (62.96.234.1)2026100702
ns2.stadt-frankfurt.de (192.76.161.1)2026100702

Checks

  • ✓ Serial 2026100702 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 8h, retry 2h, expire 7d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns.stadt-frankfurt.de is one of the listed nameservers.
  • ✓ Contact hostmaster@stadt-frankfurt.de #25
    The SOA RNAME hostmaster.stadt-frankfurt.de means hostmaster@stadt-frankfurt.de.
  • ✓ Date-based serial #26
    The serial 2026100702 follows the YYYYMMDDnn convention (2026-10-07).

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

16 records at the apex

Found

Read from
62.96.234.1:53
TypeValueTTL
SOAns.stadt-frankfurt.de. hostmaster.stadt-frankfurt.de. 2026100702 28800 7200 604800 864003600
NSns2.stadt-frankfurt.de.3600
NSns.stadt-frankfurt.de.3600
A162.159.141.253300
MX100 a160lmx0010.stadt-frankfurt.de.3600
MX100 a160lmx0011.stadt-frankfurt.de.3600
TXT"swisssign-check=yPRrANQv0A90YSbAzw9x3GPVn30"3600
TXT"cisco-ci-domain-verification=126d4b99952b3a70f98770b96561c29d09f183e6c03abfbca934a9fd6dff01bc"3600
TXT"v=spf1 mx -all"3600
TXT"google-site-verification=ZA0wozyEdjsFVr7bULgq6gbgaNBFbr0sRTwCSyxR1f8"3600
TXT"facebook-domain-verification=fsuqt0jr7yw2z8qe559v3moytmri4q"3600
CAA0 issue "swisssign.com"3600
CAA0 issue "symantec.com"3600
CAA0 issue "pki.goog"3600
CAA0 issuewild "swisssign.com"3600
CAA0 issuewild "pki.goog"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, 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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: swisssign.com, symantec.com, pki.goog.