studentenwerk.nl

Checked 22 October 2026, 16:21 UTC · via 8.8.8.8
!Passed with warnings
24 passed 1 warning 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/studentenwerk.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/studentenwerk.nl returned HTTP 429
    #3

Delegation

info

ns-1330.awsdns-38.org, ns-1912.awsdns-47.co.uk, ns-268.awsdns-33.com, ns-899.awsdns-48.net

Found

Parent zone
nl
Delegation from
ns1.dns.nl (194.0.28.53)
NS at the parent
ns-1330.awsdns-38.org, ns-1912.awsdns-47.co.uk, ns-268.awsdns-33.com, ns-899.awsdns-48.net
NS in the zone
ns-1330.awsdns-38.org, ns-1912.awsdns-47.co.uk, ns-268.awsdns-33.com, ns-899.awsdns-48.net
NameserverAddressesNetwork (AS)Glue
ns-1330.awsdns-38.org205.251.197.50 2600:9000:5305:3200::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-1912.awsdns-47.co.uk205.251.199.120 2600:9000:5307:7800::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-268.awsdns-33.com205.251.193.12 2600:9000:5301:c00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-899.awsdns-48.net205.251.195.131 2600:9000:5303:8300::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns-1330.awsdns-38.org, ns-1912.awsdns-47.co.uk, ns-268.awsdns-33.com, ns-899.awsdns-48.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-1330.awsdns-38.org 205.251.197.50NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns-1330.awsdns-38.org 2600:9000:5305:3200::1NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-1912.awsdns-47.co.uk 205.251.199.120NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-1912.awsdns-47.co.uk 2600:9000:5307:7800::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-268.awsdns-33.com 205.251.193.12NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-268.awsdns-33.com 2600:9000:5301:c00::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-899.awsdns-48.net 205.251.195.131NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-899.awsdns-48.net 2600:9000:5303:8300::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-1330.awsdns-38.org

Found

Primary (MNAME)
ns-1330.awsdns-38.org
Contact (RNAME)
awsdns-hostmaster.amazon.com
Serial
1
Refresh / retry
7200 s / 900 s
Expire
1209600 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns-1330.awsdns-38.org (205.251.197.50)1
ns-1330.awsdns-38.org (2600:9000:5305:3200::1)1
ns-1912.awsdns-47.co.uk (205.251.199.120)1
ns-1912.awsdns-47.co.uk (2600:9000:5307:7800::1)1
ns-268.awsdns-33.com (205.251.193.12)1
ns-268.awsdns-33.com (2600:9000:5301:c00::1)1
ns-899.awsdns-48.net (205.251.195.131)1
ns-899.awsdns-48.net (2600:9000:5303:8300::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 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns-1330.awsdns-38.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

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

17 records at the apex

Found

Read from
205.251.197.50:53
TypeValueTTL
SOAns-1330.awsdns-38.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400900
NSns-1330.awsdns-38.org.172800
NSns-1912.awsdns-47.co.uk.172800
NSns-268.awsdns-33.com.172800
NSns-899.awsdns-48.net.172800
A34.160.109.63300
AAAA2600:1901:0:48b7::300
MX1 aspmx.l.google.com.3600
MX10 alt1.aspmx.l.google.com.3600
MX10 alt2.aspmx.l.google.com.3600
MX20 alt3.aspmx.l.google.com.3600
MX20 alt4.aspmx.l.google.com.3600
TXT"MS=ms92054939"3600
TXT"P5+6SlaL6yWaE+fL1qIBwkYv+y/DXQFuTAaTcU1eTqBkoPcuG772ACoMs3XO16eueSgjVc9M62I4xm5aWjylsQ=="3600
TXT"google-site-verification=KhEpcBCpcOHbBfGc3wwgAe2ZFKJLKy_RHZWL7z6WbPA"3600
TXT"google-site-verification=Wb2dB0pdO2NQyESCSIsgu33sXs70rBT3B3b7oNZ2AlY"3600
TXT"v=spf1 include:_spf.google.com include:_spf.sparkpostmail.com ip4:178.237.41.0/25 ip4:62.177.221.26/30 ip6:2A00:1188:0005:0005::/64 mx ~all"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, AAAA 5m, MX 1h, NS 2d. The NS TTL at the parent is 1h and in the zone 2d; 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