noordhoff.nl

Checked 22 October 2026, 14:50 UTC · via 8.8.8.8
iAll checks passed
29 passed 0 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/noordhoff.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/noordhoff.nl returned HTTP 429
    #3

Delegation

info

ns-1341.awsdns-39.org, ns-1678.awsdns-17.co.uk, ns-55.awsdns-06.com, ns-837.awsdns-40.net

Found

Parent zone
nl
Delegation from
ns1.dns.nl (194.0.28.53)
NS at the parent
ns-1341.awsdns-39.org, ns-1678.awsdns-17.co.uk, ns-55.awsdns-06.com, ns-837.awsdns-40.net
NS in the zone
ns-1341.awsdns-39.org, ns-1678.awsdns-17.co.uk, ns-55.awsdns-06.com, ns-837.awsdns-40.net
NameserverAddressesNetwork (AS)Glue
ns-1341.awsdns-39.org205.251.197.61 2600:9000:5305:3d00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-1678.awsdns-17.co.uk205.251.198.142 2600:9000:5306:8e00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-55.awsdns-06.com205.251.192.55 2600:9000:5300:3700::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-837.awsdns-40.net205.251.195.69 2600:9000:5303:4500::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns-1341.awsdns-39.org, ns-1678.awsdns-17.co.uk, ns-55.awsdns-06.com, ns-837.awsdns-40.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-1341.awsdns-39.org 205.251.197.61NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns-1341.awsdns-39.org 2600:9000:5305:3d00::1NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-1678.awsdns-17.co.uk 205.251.198.142NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-1678.awsdns-17.co.uk 2600:9000:5306:8e00::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-55.awsdns-06.com 205.251.192.55NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-55.awsdns-06.com 2600:9000:5300:3700::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-837.awsdns-40.net 205.251.195.69NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-837.awsdns-40.net 2600:9000:5303:4500::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-1341.awsdns-39.org

Found

Primary (MNAME)
ns-1341.awsdns-39.org
Contact (RNAME)
awsdns-hostmaster.amazon.com
Serial
1
Refresh / retry
7200 s / 900 s
Expire
1209600 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
ns-1341.awsdns-39.org (205.251.197.61)1
ns-1341.awsdns-39.org (2600:9000:5305:3d00::1)1
ns-1678.awsdns-17.co.uk (205.251.198.142)1
ns-1678.awsdns-17.co.uk (2600:9000:5306:8e00::1)1
ns-55.awsdns-06.com (205.251.192.55)1
ns-55.awsdns-06.com (2600:9000:5300:3700::1)1
ns-837.awsdns-40.net (205.251.195.69)1
ns-837.awsdns-40.net (2600:9000:5303:4500::1)1

Checks

  • ✓ Serial 1 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 2h, retry 15m, expire 14d, negative TTL 5m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns-1341.awsdns-39.org is one of the listed nameservers.
  • ✓ Contact awsdns-hostmaster@amazon.com #25
    The SOA RNAME awsdns-hostmaster.amazon.com means awsdns-hostmaster@amazon.com.
  • ✓ Counter serial #26
    The serial 1 is a plain counter.

DNSSEC

info

Signed, DS published at parent

Found

Validated by resolver
yes
Denial of existence
NSEC
Signatures valid until
22 October 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
1206ECDSAP256SHA256 (13)SHA256 DB00731600776FFF…yes

DNSKEY in the zone

Key tagRoleAlgorithm
61803ZSK (256)ECDSAP256SHA256 (13)
45546ZSK (256)ECDSAP256SHA256 (13)
1206KSK (257)ECDSAP256SHA256 (13)

Checks

  • ✓ Signed and validated #27
    The zone is signed, the parent publishes a DS record, and the resolver validates the answers.
  • ✓ DS matches a key #28
    The DS record at the parent matches a key in the zone: key tag 1206 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: ECDSAP256SHA256 (13).
  • ✓ Short-lived signatures (online signing) #30
    Signatures are valid for 2h0m0s and created on demand; the current one was made at 2026-10-22 13:50 UTC and expires at 2026-10-22 16:05 UTC.
  • i
    NSEC
    The zone uses NSEC, so its full contents can be listed by walking the NSEC chain. That is fine unless the names are sensitive.
    #31

Records

pass

40 records at the apex

Found

Read from
205.251.197.61:53
TypeValueTTL
SOAns-1341.awsdns-39.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 300900
NSns-1341.awsdns-39.org.900
NSns-1678.awsdns-17.co.uk.900
NSns-55.awsdns-06.com.900
NSns-837.awsdns-40.net.900
A104.40.147.216300
MX0 noordhoff-nl.mail.protection.outlook.com.300
TXT"E7Y0ft7q1GyZswIbFzMDZ6hEjmnNj7rZX6ldLUHZY+19CI7of5w1KemXfgu2c14uSISKfvEEmfUWheaMKAXL6A=="300
TXT"MS=ms49535965"300
TXT"SFMC-CQhY0tYFc7t-yKHK2QnrU-dXS98wJOmwYgsZMZfv"300
TXT"ZOOM_verify_j52aSXQrT2aSWDhGuIluQA"300
TXT"adobe-idp-site-verification=ce16276b-5cec-4a26-ae10-cb69122e59f7"300
TXT"ca3-9b1227f3d5134508bb47029c90848f55"300
TXT"clickhouse-verification=71724082e4da3b5b37cc0d4cba7c2392ffccacc1f8dc1f08a9d10ac2f6ba9f3a"300
TXT"facebook-domain-verification=pwcpzsdaw0hvr43zolr9w1abfybaa5"300
TXT"google-site-verification=JTTxjoXA7IuKsZZMq81rGqAYkZKGTr4JAUHlU_7ayIs"300
TXT"google-site-verification=mRpF-9XmwLEWPHREz51FfA26QaC_M2sANJ78IeI-R7E"300
TXT"have-i-been-pwned-verification=dweb_d8kn5y2yqfe4fnytl25ikj30"300
TXT"have-i-been-pwned-verification=dweb_wcb5aqtkzlgffdfsor7fe1lv"300
TXT"knowbe4-site-verification=699711b3d86e0fd0e7e438bc2510819f"300
TXT"miro-verification=a6b54166cab3e651cc1a6e7f915da21bded249dc"300
TXT"mixpanel-domain-verify=ed62dd49-d265-480c-bb74-88bd66841797"300
TXT"notion-domain-verification=ztRbh4HkvZSaMOpVY11NpBN2mpz8FX0G2fdOWGxqxSz"300
TXT"openai-domain-verification=10813392"300
TXT"openai-domain-verification=dv-F63K8CcxKvu3gZPNcRhI2zI9"300
TXT"pp+s81eyGzDPfjIMZnIE/6eF5e8u5Z8HB2aWuTTLtLEluwcvdGhHMbfwOh9SHeiOsUSruhZ1u3J4XvB9oCVkRw=="300
TXT"status-page-domain-verification=gscypn921txq"300
TXT"stripe-verification=8EEDE6CD8003682CA06114799760CA0E6E4C81532865509D2B57833AECE55277"300
TXT"v=spf1 include:spf1.noordhoff.nl include:spf2.noordhoff.nl include:spf3.noordhoff.nl include:spf4.noordhoff.nl include:spf5.noordhoff.nl include:spf6.noordhoff.nl include:spf7.noordhoff.nl include:spf8.noordhoff.nl -all"300
CAA0 iodef "mailto:pnijenhuis@infinitaslearning.com"300
CAA0 issue "digicert.com"300
CAA0 issue "letsencrypt.org"300
CAA0 issue "pki.goog; cansignhttpexchanges=yes"300
CAA0 issue "sectigo.com"300
CAA0 issue "ssl.com"300
CAA0 issuewild "digicert.com"300
CAA0 issuewild "letsencrypt.org"300
CAA0 issuewild "pki.goog; cansignhttpexchanges=yes"300
CAA0 issuewild "sectigo.com"300
CAA0 issuewild "ssl.com"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 5m, NS 15m. The NS TTL at the parent is 1h and in the zone 15m; 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: digicert.com, letsencrypt.org, pki.goog, sectigo.com, ssl.com.