itc.nl

Checked 21 October 2026, 21:22 UTC · via 8.8.8.8
!Passed with warnings
28 passed 1 warning 0 failed 6 info

Registration

info

.nl country-code · Universiteit Twente

Found

TLD
.nl (country-code)
ICANN policies apply
no
Registrar
Universiteit Twente
Registered
1 November 1988
Last changed
9 January 2019
Status
active
Registry nameservers
ns1.utwente.nl, ns2.utwente.nl, ns3.utwente.nl
RDAP server
https://rdap.sidn.nl/

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
    Expiry date not published
    The registry does not publish the expiry date in RDAP. Check it with your registrar.
    #3
  • i
    No transfer lock
    The domain has no transfer lock (status: active). A registrar lock protects against unauthorized transfers.
    #4
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

info

ns1.utwente.nl, ns2.utwente.nl, ns3.utwente.nl

Found

Parent zone
nl
Delegation from
ns1.dns.nl (194.0.28.53)
NS at the parent
ns1.utwente.nl, ns2.utwente.nl, ns3.utwente.nl
NS in the zone
ns1.utwente.nl, ns2.utwente.nl, ns3.utwente.nl
NameserverAddressesNetwork (AS)Glue
ns1.utwente.nl130.89.1.2 2001:67c:2564:a102::3:1AS1133 UTWENTE-AS - SURF B.V., NL AS1133 UTWENTE-AS - SURF B.V., NL130.89.1.2 2001:67c:2564:a102::3:1
ns2.utwente.nl130.89.1.3 2001:67c:2564:a102::3:2AS1133 UTWENTE-AS - SURF B.V., NL AS1133 UTWENTE-AS - SURF B.V., NL130.89.1.3 2001:67c:2564:a102::3:2
ns3.utwente.nl131.155.0.37AS1161 AS-TUE - SURF B.V., NL131.155.0.37

Checks

  • ✓ 3 nameservers #6
    Delegated to ns1.utwente.nl, ns2.utwente.nl, ns3.utwente.nl.
  • ✓ 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.
  • i
    One address family in one network
    all IPv6 addresses are in 2001:67c:2564::/48, while the other address family is spread over several networks.
    #10
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS1133 (UTWENTE-AS - SURF B.V., NL): 4 addresses; AS1161 (AS-TUE - SURF B.V., NL): 1 address.
  • i
    All nameserver names under .nl
    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
  • i
    Partly IPv6
    These nameservers have no IPv6 address: ns3.utwente.nl.
    #13

Nameservers

pass

5 of 5 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.utwente.nl 130.89.1.2NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns1.utwente.nl 2001:67c:2564:a102::3:1NOERROR, 15 ms, authoritativenoyes / yesrefused-
ns2.utwente.nl 130.89.1.3NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns2.utwente.nl 2001:67c:2564:a102::3:2NOERROR, 12 ms, authoritativenoyes / yesrefused-
ns3.utwente.nl 131.155.0.37NOERROR, 12 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 5 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 2181021473 · primary ns1.utwente.nl

Found

Primary (MNAME)
ns1.utwente.nl
Contact (RNAME)
dnsmaster.utwente.nl
Serial
2181021473
Refresh / retry
28800 s / 7200 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns1.utwente.nl (130.89.1.2)2181021473
ns1.utwente.nl (2001:67c:2564:a102::3:1)2181021473
ns2.utwente.nl (130.89.1.3)2181021473
ns2.utwente.nl (2001:67c:2564:a102::3:2)2181021473
ns3.utwente.nl (131.155.0.37)2181021473

Checks

  • ✓ Serial 2181021473 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 ns1.utwente.nl is one of the listed nameservers.
  • ✓ Contact dnsmaster@utwente.nl #25
    The SOA RNAME dnsmaster.utwente.nl means dnsmaster@utwente.nl.
  • ✓ Timestamp serial #26
    The serial 2181021473 is a Unix timestamp (2039-02-11 07:17 UTC).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver
yes
Denial of existence
NSEC3
NSEC3
10 iterations, 16-byte salt
Signatures valid until
17 November 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
48277RSASHA256 (8)SHA256 56E74B3D70ABCEDA…yes

DNSKEY in the zone

Key tagRoleAlgorithm
9804ZSK (256)RSASHA256 (8)
1878ZSK (256)RSASHA256 (8)
48277KSK (257)RSASHA256 (8)

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 48277 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: RSASHA256 (8).
  • ✓ Signatures valid until 2026-11-17 #30
    The earliest DNSKEY/SOA signature expires at 2026-11-17 23:21 UTC.
  • !
    NSEC3 with extra iterations or salt
    NSEC3 uses 10 iterations and a 16-byte salt. RFC 9276 recommends 0 iterations and no salt: extra iterations cost resolvers CPU and add no real protection, and some validators treat high counts as insecure.
    #31

Records

pass

14 records at the apex

Found

Read from
130.89.1.2:53
TypeValueTTL
SOAns1.utwente.nl. dnsmaster.utwente.nl. 2181021473 28800 7200 604800 864001800
NSns1.utwente.nl.1800
NSns2.utwente.nl.1800
NSns3.utwente.nl.1800
A130.89.12.121800
MX10 itc-nl.mail.protection.outlook.com.900
TXT"MS=ms96365399"3600
TXT"v=spf1 include:_spf.utwente.nl -all"3600
TXT"HARICA-z1g5OzZQtBY2MI4QSEw"3600
CAA0 issue "letsencrypt.org"3600
CAA0 issuemail ";"3600
CAA0 issuewild "letsencrypt.org"3600
CAA0 issue "harica.gr"3600
CAA0 iodef "mailto:scs-ra@utwente.nl"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 30m, MX 15m, NS 30m. The NS TTL at the parent is 1h and in the zone 30m; 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: letsencrypt.org, harica.gr.