tue.nl

Checked 21 October 2026, 21:26 UTC · via 8.8.8.8
!Passed with warnings
24 passed 2 warnings 0 failed 9 info

Registration

info

.nl country-code · Technische Universiteit Eindhoven

Found

TLD
.nl (country-code)
ICANN policies apply
no
Registrar
Technische Universiteit Eindhoven
Registered
2 July 1987
Last changed
23 April 2026
Status
active
Registry nameservers
ns01.tue.nl, ns02.tue.nl, ns3.tue.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

warn

ns01.tue.nl, ns02.tue.nl, ns3.tue.nl

Found

Parent zone
nl
Delegation from
ns1.dns.nl (194.0.28.53)
NS at the parent
ns01.tue.nl, ns02.tue.nl, ns3.tue.nl
NS in the zone
ns01.tue.nl, ns02.tue.nl
NameserverAddressesNetwork (AS)Glue
ns01.tue.nl131.155.3.20 2001:610:b41:1000::20AS1161 AS-TUE - SURF B.V., NL AS1103 SURFNET-NL - SURF B.V., NL131.155.3.20 2001:610:b41:1000::20
ns02.tue.nl131.155.3.30 2001:610:b41:1001::30AS1161 AS-TUE - SURF B.V., NL AS1103 SURFNET-NL - SURF B.V., NL131.155.3.30 2001:610:b41:1001::30
ns3.tue.nl (parent only)130.89.2.7AS1133 UTWENTE-AS - SURF B.V., NL130.89.2.7

Checks

  • ✓ 3 nameservers #6
    Delegated to ns01.tue.nl, ns02.tue.nl, ns3.tue.nl.
  • !
    NS sets differ
    The nameservers at the parent and in the zone should be the same. Only at the parent: ns3.tue.nl. ns01.tue.nl, ns02.tue.nl, ns3.tue.nl report NS ns01.tue.nl ns02.tue.nl.
    #7
  • ✓ Glue present and correct #8
    Glue is published for the nameservers inside the zone: ns01.tue.nl, ns02.tue.nl, ns3.tue.nl.
  • ✓ 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 2001:610:b41::/48, while the other address family is spread over several networks.
    #10
  • ✓ 3 autonomous systems #11
    The nameservers are spread over: AS1103 (SURFNET-NL - SURF B.V., NL): 2 addresses; AS1133 (UTWENTE-AS - SURF B.V., NL): 1 address; AS1161 (AS-TUE - SURF B.V., NL): 2 addresses.
  • 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.tue.nl.
    #13

Nameservers

info

5 of 5 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns01.tue.nl 131.155.3.20NOERROR, 12 ms, authoritativenoyes / yesrefused-
ns01.tue.nl 2001:610:b41:1000::20NOERROR, 12 ms, authoritativenoyes / yesrefused-
ns02.tue.nl 131.155.3.30NOERROR, 12 ms, authoritativenoyes / yesrefused-
ns02.tue.nl 2001:610:b41:1001::30NOERROR, 12 ms, authoritativenoyes / yesrefused-
ns3.tue.nl 130.89.2.7NOERROR, 13 ms, authoritativenoyes / yesrefusedSecurity through obscurity

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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: ns3.tue.nl: "Security through obscurity".
    #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

info

serial 72976 · primary ipam.tue.nl

Found

Primary (MNAME)
ipam.tue.nl
Contact (RNAME)
hostmaster.tue.nl
Serial
72976
Refresh / retry
10800 s / 3600 s
Expire
2419200 s
Negative TTL
900 s

Serial per nameserver

NameserverSerial
ns01.tue.nl (131.155.3.20)72976
ns01.tue.nl (2001:610:b41:1000::20)72976
ns02.tue.nl (131.155.3.30)72976
ns02.tue.nl (2001:610:b41:1001::30)72976
ns3.tue.nl (130.89.2.7)72976

Checks

  • ✓ Serial 72976 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 28d, negative TTL 15m.
  • i
    Hidden master
    The primary nameserver ipam.tue.nl is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.
    #24
  • ✓ Contact hostmaster@tue.nl #25
    The SOA RNAME hostmaster.tue.nl means hostmaster@tue.nl.
  • ✓ Counter serial #26
    The serial 72976 is a plain counter.

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver
yes
Denial of existence
NSEC3
NSEC3
10 iterations, 11-byte salt
Signatures valid until
25 October 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
16415RSASHA256 (8)SHA256 75AA3F38B547BDC3…yes

DNSKEY in the zone

Key tagRoleAlgorithm
16415KSK (257)RSASHA256 (8)
37209ZSK (256)RSASHA256 (8)
60901ZSK (256)RSASHA256 (8)
61611ZSK (256)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 16415 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: RSASHA256 (8).
  • ✓ Short-lived signatures (online signing) #30
    Signatures are valid for 97h0m0s and created on demand; the current one was made at 2026-10-21 05:54 UTC and expires at 2026-10-25 06:48 UTC.
  • !
    NSEC3 with extra iterations or salt
    NSEC3 uses 10 iterations and a 11-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

info

21 records at the apex

Found

Read from
131.155.3.20:53
TypeValueTTL
SOAipam.tue.nl. hostmaster.tue.nl. 72976 10800 3600 2419200 90086400
NSns01.tue.nl.86400
NSns02.tue.nl.86400
A131.155.10.13586400
MX10 tue-nl.mail.protection.outlook.com.86400
TXT"google-site-verification=uNp_IVRt-7BLrpDzH925tElqmPLaeMVrFBV-MTNizv4"86400
TXT"google-site-verification=WwQlrCFBbFYz9HaIZTCskfrONfrROlnfabGixoqwyS0"86400
TXT"adobe-idp-site-verification=8d48631e0b4d87e4d1c6f0d04bc8c5b8106bfcdb3cfad0f0a2be59ae8f67f80f"86400
TXT"MS=58573ACBE8201AC4B395EF00A745C38DB1DD57FA"86400
TXT"P.O. Box 513, 5600 MB Eindhoven, The Netherlands"86400
TXT"Eindhoven University of Technology"86400
TXT"autodesk-domain-verification=p53xRNeOV9HPWzWd2l2t"86400
TXT"mgverify=870f2f8187f4d172141d9f194ca8e343f25a36b8ebe3474e711a9d0e6eba4deb"86400
TXT"mentimeter-aa1b69ac-305e-466e-bcd6-aec5639817c2"86400
TXT"anthropic-domain-verification-mdd659=5GXFiqI1LUZ2Qx559qlWCEU4x"86400
TXT"v=spf1 ip4:167.89.63.218 ip4:185.138.80.117 include:spfdefault.mail.tue.nl include:spf.topdesk.net include:smtpeter.com include:spf.interconnect.nl include:carerix.net a:outmail.hireserve.nl -all"86400
TXT"HARICA-GlxBaOFIfXadSGMI3NV"86400
TXT"globalsign-domain-verification=1F7EC979113CCDF8F244158D6DFF7947"86400
TXT"miro-verification=cb1958a2546dab9752639eeb5a07b1cf02ec18a8"86400
TXT"facebook-domain-verification=eyg9tk0dlzfngb7spof8kirgsjye06"86400
TXT"atlassian-domain-verification=EATjeWp2TWSpBt8CIt5ngmWgUCL58gs8ZYa9LUdUS4IiMHmeJiiYEVTwYH8f07vJ"86400

Checks

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