tripadvisor.nl

Checked 21 October 2026, 21:26 UTC · via 8.8.8.8
!Passed with warnings
23 passed 2 warnings 0 failed 4 info

Registration

info

.nl country-code

Found

TLD
.nl (country-code)
ICANN policies apply
no
Lookup error: https://rdap.sidn.nl/domain/tripadvisor.nl returned HTTP 429

Checks

  • i
    .nl 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
    .nl is delegated in the root zone and DNSSEC-signed.
  • i
    Could not be checked
    The RDAP lookup failed, so this could not be checked: https://rdap.sidn.nl/domain/tripadvisor.nl returned HTTP 429
    #3

Delegation

info

ns-1123.awsdns-12.org, ns-1887.awsdns-43.co.uk, ns-272.awsdns-34.com, ns-537.awsdns-03.net

Found

Parent zone
nl
Delegation from
ns1.dns.nl (194.0.28.53)
NS at the parent
ns-1123.awsdns-12.org, ns-1887.awsdns-43.co.uk, ns-272.awsdns-34.com, ns-537.awsdns-03.net
NS in the zone
ns-1123.awsdns-12.org, ns-1887.awsdns-43.co.uk, ns-272.awsdns-34.com, ns-537.awsdns-03.net
NameserverAddressesNetwork (AS)Glue
ns-1123.awsdns-12.org205.251.196.99 2600:9000:5304:6300::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-1887.awsdns-43.co.uk205.251.199.95 2600:9000:5307:5f00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-272.awsdns-34.com205.251.193.16 2600:9000:5301:1000::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-537.awsdns-03.net205.251.194.25 2600:9000:5302:1900::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns-1123.awsdns-12.org, ns-1887.awsdns-43.co.uk, ns-272.awsdns-34.com, ns-537.awsdns-03.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 4 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS16509 (AMAZON-02 - Amazon.com, Inc., US): 8 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.
    #11
  • ✓ Nameserver names under 4 TLDs #12
    Nameserver names use the TLDs .com, .net, .org, .uk.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

pass

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns-1123.awsdns-12.org 205.251.196.99NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns-1123.awsdns-12.org 2600:9000:5304:6300::1NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-1887.awsdns-43.co.uk 205.251.199.95NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-1887.awsdns-43.co.uk 2600:9000:5307:5f00::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-272.awsdns-34.com 205.251.193.16NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-272.awsdns-34.com 2600:9000:5301:1000::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-537.awsdns-03.net 205.251.194.25NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-537.awsdns-03.net 2600:9000:5302:1900::1NOERROR, 4 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 8 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.
  • ✓ No version disclosed #17
    The nameservers don't reveal their software version.
  • ✓ 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 1 · primary ns-1123.awsdns-12.org

Found

Primary (MNAME)
ns-1123.awsdns-12.org
Contact (RNAME)
hostmaster.tripadvisor.com
Serial
1
Refresh / retry
43200 s / 7200 s
Expire
1209600 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
ns-1123.awsdns-12.org (205.251.196.99)1
ns-1123.awsdns-12.org (2600:9000:5304:6300::1)1
ns-1887.awsdns-43.co.uk (205.251.199.95)1
ns-1887.awsdns-43.co.uk (2600:9000:5307:5f00::1)1
ns-272.awsdns-34.com (205.251.193.16)1
ns-272.awsdns-34.com (2600:9000:5301:1000::1)1
ns-537.awsdns-03.net (205.251.194.25)1
ns-537.awsdns-03.net (2600:9000:5302:1900::1)1

Checks

  • ✓ Serial 1 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 12h, retry 2h, expire 14d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns-1123.awsdns-12.org is one of the listed nameservers.
  • ✓ Contact hostmaster@tripadvisor.com #25
    The SOA RNAME hostmaster.tripadvisor.com means hostmaster@tripadvisor.com.
  • ✓ Counter serial #26
    The serial 1 is a plain counter.

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

18 records at the apex

Found

Read from
205.251.196.99:53
TypeValueTTL
SOAns-1123.awsdns-12.org. hostmaster.tripadvisor.com. 1 43200 7200 1209600 360086400
NSns-1123.awsdns-12.org.86400
NSns-1887.awsdns-43.co.uk.86400
NSns-272.awsdns-34.com.86400
NSns-537.awsdns-03.net.86400
A143.204.181.9060
A143.204.181.8660
A143.204.181.12160
A143.204.181.4260
MX10 smtp.google.com.300
TXT"MS=ms17099034"3600
TXT"_2erojipq9p68ygptyqgypy83ah2dnzz"3600
TXT"_globalsign-domain-verification=AypeKqxqgPzbYzNBopLZMGJhgtsFATa6gI2FFNNZ57"3600
TXT"bnyGlxykTsBZSdNWWe3jXJ5tVU2U7gsTx6UjsZyIpHk="3600
TXT"facebook-domain-verification=jbfi86zwm73rk7t5dtuybsgt93449y"3600
TXT"facebook-domain-verification=rld5ayte5pgnngj4ljg2ovn3kaeo4q"3600
TXT"google-site-verification=pKQoaA0kuRTEjUnj-AhnrgrXZlcmHYw21jBNDpfg6r8"3600
TXT"v=spf1 include:_spf.tripadvisor.com ~all"3600

Checks

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