trivago.de

Checked 22 October 2026, 00:41 UTC · via 8.8.8.8
!Passed with warnings
22 passed 3 warnings 0 failed 4 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

a1-92.akam.net, a11-67.akam.net, a2-67.akam.net, a22-64.akam.net, a24-64.akam.net, a5-66.akam.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
a1-92.akam.net, a11-67.akam.net, a2-67.akam.net, a22-64.akam.net, a24-64.akam.net, a5-66.akam.net
NS in the zone
a1-92.akam.net, a11-67.akam.net, a2-67.akam.net, a22-64.akam.net, a24-64.akam.net, a5-66.akam.net
NameserverAddressesNetwork (AS)Glue
a1-92.akam.net193.108.91.92 2600:1401:2::5cAS20940 AKAMAI-ASN1 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a11-67.akam.net84.53.139.67 2600:1480:1::43AS20940 AKAMAI-ASN1 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a2-67.akam.net95.100.174.67 2600:1480:7000::43AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a22-64.akam.net23.211.61.64 2600:1480:7800::40AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a24-64.akam.net2.16.130.64 2600:1480:9800::40AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a5-66.akam.net95.100.168.66 2600:1480:b000::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-

Checks

  • ✓ 6 nameservers #6
    Delegated to a1-92.akam.net, a11-67.akam.net, a2-67.akam.net, a22-64.akam.net, a24-64.akam.net, a5-66.akam.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 6 IPv4 /24s and 6 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS20940 (AKAMAI-ASN1 - Akamai International B.V., NL): 2 addresses; AS21342 (AKAMAI-ASN2 - Akamai International B.V., NL): 10 addresses.
  • i
    All nameserver names under .net
    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
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

warn

12 of 12 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
a1-92.akam.net 193.108.91.92NOERROR, 3 ms, authoritativenoyes / yesrefused41824.4
a1-92.akam.net 2600:1401:2::5cNOERROR, 5 ms, authoritativenoyes / yesrefused41824.7
a11-67.akam.net 84.53.139.67NOERROR, 4 ms, authoritativenoyes / yesrefused41824.4
a11-67.akam.net 2600:1480:1::43NOERROR, 3 ms, authoritativenoyes / yesrefused41824.6
a2-67.akam.net 95.100.174.67NOERROR, 3 ms, authoritativenoyes / yesrefused48878.30
a2-67.akam.net 2600:1480:7000::43NOERROR, 5 ms, authoritativenoyes / yesrefused48878.27
a22-64.akam.net 23.211.61.64NOERROR, 4 ms, authoritativenoyes / yesrefused48878.32
a22-64.akam.net 2600:1480:7800::40NOERROR, 4 ms, authoritativenoyes / yesrefused48878.31
a24-64.akam.net 2.16.130.64NOERROR, 3 ms, authoritativenoyes / yesrefused48878.30
a24-64.akam.net 2600:1480:9800::40NOERROR, 7 ms, authoritativenoyes / yesrefused48878.29
a5-66.akam.net 95.100.168.66NOERROR, 4 ms, authoritativenoyes / yesrefused41824.6
a5-66.akam.net 2600:1480:b000::42NOERROR, 7 ms, authoritativenoyes / yesrefused41824.7

Checks

  • ✓ All respond #14
    All 12 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: a1-92.akam.net: "41824.4"; a1-92.akam.net: "41824.7"; a11-67.akam.net: "41824.4"; a11-67.akam.net: "41824.6"; a2-67.akam.net: "48878.30"; a2-67.akam.net: "48878.27"; a22-64.akam.net: "48878.32"; a22-64.akam.net: "48878.31"; a24-64.akam.net: "48878.30"; a24-64.akam.net: "48878.29"; a5-66.akam.net: "41824.6"; a5-66.akam.net: "41824.7". 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 2026071301 · primary a1-92.akam.net

Found

Primary (MNAME)
a1-92.akam.net
Contact (RNAME)
noc.trivago.net
Serial
2026071301
Refresh / retry
43200 s / 7200 s
Expire
2592000 s
Negative TTL
43200 s

Serial per nameserver

NameserverSerial
a1-92.akam.net (193.108.91.92)2026071301
a1-92.akam.net (2600:1401:2::5c)2026071301
a11-67.akam.net (84.53.139.67)2026071301
a11-67.akam.net (2600:1480:1::43)2026071301
a2-67.akam.net (95.100.174.67)2026071301
a2-67.akam.net (2600:1480:7000::43)2026071301
a22-64.akam.net (23.211.61.64)2026071301
a22-64.akam.net (2600:1480:7800::40)2026071301
a24-64.akam.net (2.16.130.64)2026071301
a24-64.akam.net (2600:1480:9800::40)2026071301
a5-66.akam.net (95.100.168.66)2026071301
a5-66.akam.net (2600:1480:b000::42)2026071301

Checks

  • ✓ Serial 2026071301 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 12h, retry 2h, expire 30d, negative TTL 12h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver a1-92.akam.net is one of the listed nameservers.
  • ✓ Contact noc@trivago.net #25
    The SOA RNAME noc.trivago.net means noc@trivago.net.
  • ✓ Date-based serial #26
    The serial 2026071301 follows the YYYYMMDDnn convention (2026-07-13).

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

21 records at the apex

Found

Read from
193.108.91.92:53
TypeValueTTL
SOAa1-92.akam.net. noc.trivago.net. 2026071301 43200 7200 2592000 43200900
NSa22-64.akam.net.900
NSa24-64.akam.net.900
NSa5-66.akam.net.900
NSa1-92.akam.net.900
NSa2-67.akam.net.900
NSa11-67.akam.net.900
A2.16.204.13920
A2.16.204.15520
AAAA2a02:26f0:b700:3::210:cc8b20
AAAA2a02:26f0:b700:3::210:cc9b20
MX10 trivago-de.mail.protection.outlook.com.900
TXT"MS=ms90928900"900
TXT"ahrefs-site-verification_c59586c96c2e3ae85a64edd9f506b21b62b8382b6f30385e8a3af024958c0571"900
TXT"v=spf1 mx a:mail0.trivago.net include:spf-trivago.trivago.net a:zgateway.zuora.com include:mail.zendesk.com include:docebosaas.com -all"900
TXT"_czsvjapo4zofxsrorwolwb12hrs0uh6"900
TXT"apple-domain-verification=JpFe9EoRqx4MxdTe"900
TXT"spycloud-domain-verification=8189b5fe-434e-4adb-9e29-635880677850"900
TXT"s1xtfnwx3srhb01nl1s2s32hcyjg9zyr"900
TXT"google-site-verification=qfGEdf4wzuvWoqtAJR7uHMPQeZvwRaBjXGzKbZXWr6c"900
TXT"facebook-domain-verification=wkgzl72i6f9as2xv1ha5ebfvgkjkks"900

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (20s), AAAA (20s). Low TTLs are useful just before a planned change. The NS TTL at the parent is 1d and in the zone 15m; resolvers may use either.
    #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