Domain report: vu.nl

Registration

info

.nl country-code

Found

TLD: .nl (country-code)
ICANN policies apply: no

Lookup error: https://rdap.sidn.nl/domain/vu.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/vu.nl returned HTTP 429

#3

Delegation

warn

new-ns1.vu.nl, new-ns2.vu.nl

Found

Parent zone: nl
Delegation from: ns1.dns.nl (194.0.28.53)
NS at the parent: new-ns1.vu.nl, new-ns2.vu.nl
NS in the zone: new-ns1.vu.nl, new-ns2.vu.nl

Nameserver	Addresses	Network (AS)	Glue
new-ns1.vu.nl	130.37.164.20	AS1103 SURFNET-NL - SURF B.V., NL	130.37.164.20
new-ns2.vu.nl	130.37.164.22	AS1103 SURFNET-NL - SURF B.V., NL	130.37.164.22

Checks

i

2 nameservers

Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: new-ns1.vu.nl, new-ns2.vu.nl.

#6
✓ Parent and zone agree #7

The parent delegation and the zone's NS records list the same nameservers.
✓ Glue present and correct #8

Glue is published for the nameservers inside the zone: new-ns1.vu.nl, new-ns2.vu.nl.
✓ All names resolve #9

Every nameserver name has an address and is not an alias.
!

Nameservers in one network

all IPv4 addresses are in 130.37.164.0/24. A single network failure takes all nameservers down; RFC 2182 recommends topologically separate networks (anycast setups are an exception).

#10
i

All nameservers in one AS

All nameserver addresses are announced by one network operator (AS1103 (SURFNET-NL - SURF B.V., NL): 2 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.

#11
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
!

No IPv6

None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.

#13

Nameservers

info

2 of 2 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
new-ns1.vu.nl 130.37.164.20	NOERROR, 10 ms, authoritative	no	yes / yes	refused	Not supported
new-ns2.vu.nl 130.37.164.22	NOERROR, 10 ms, authoritative	no	yes / yes	refused	Not supported

Checks

✓ All respond #14

All 2 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: new-ns1.vu.nl: "Not supported"; new-ns2.vu.nl: "Not supported".

#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

pass

serial 2024294592 · primary new-ns1.vu.nl

Found

Primary (MNAME): new-ns1.vu.nl
Contact (RNAME): hostmaster.vu.nl
Serial: 2024294592
Refresh / retry: 10800 s / 1080 s
Expire: 2419200 s
Negative TTL: 900 s

Serial per nameserver

Nameserver	Serial
new-ns1.vu.nl (130.37.164.20)	2024294592
new-ns2.vu.nl (130.37.164.22)	2024294592

Checks

✓ Serial 2024294592 everywhere #22

All nameservers serve the same version of the zone.
✓ Timers within recommendations #23

SOA refresh 3h, retry 18m, expire 28d, negative TTL 15m.
✓ Primary is a public nameserver #24

The primary nameserver new-ns1.vu.nl is one of the listed nameservers.
✓ Contact hostmaster@vu.nl #25

The SOA RNAME hostmaster.vu.nl means hostmaster@vu.nl.
✓ Timestamp serial #26

The serial 2024294592 is a Unix timestamp (2034-02-23 08:03 UTC).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 10 iterations, 2-byte salt
Signatures valid until: 24 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
6004	RSASHA256 (8)	SHA256 00C977F596294AD0…	yes
64997	RSASHA256 (8)	SHA256 C4E1C107050AB567…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
2580	ZSK (256)	RSASHA256 (8)
6004	KSK (257)	RSASHA256 (8)
60225	ZSK (256)	RSASHA256 (8)
64997	KSK (257)	RSASHA256 (8)
14353	ZSK (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 6004 (SHA256), key tag 64997 (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 2026-10-20 23:18 UTC and expires at 2026-10-24 23:52 UTC.
!

NSEC3 with extra iterations or salt

NSEC3 uses 10 iterations and a 2-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

31 records at the apex

Found

Read from: 130.37.164.20:53

Type	Value	TTL
SOA	new-ns1.vu.nl. hostmaster.vu.nl. 2024294592 10800 1080 2419200 900	28800
NS	new-ns2.vu.nl.	28800
NS	new-ns1.vu.nl.	28800
A	52.232.69.102	600
MX	0 vu-nl.mail.protection.outlook.com.	86400
TXT	"atlassian-domain-verification=4DKZByaje8L/OfqPKIBr9eFCxXWL7x17aQeSAH5OE0dv32q8PXT/ibb45DBX6h1T"	60
TXT	"HARICA-secHGalIYiXSvcn7x1L"	60
TXT	"facebook-domain-verification=z5lo4vme7tj7rz0rkrjeyw3ficdkrt"	60
TXT	"HO5Hae8DJUssBXMJPxF8SuoTVyO4suOdM/31NLC0WwA="	60
TXT	"v=spf1 include:_spf.vu.nl include:spf.protection.outlook.com include:_spf.x-com.nl include:spf.coachview.net include:outboundmail.blackbaud.net ip4:194.150.14.85 include:spf.formdesk.com ip4:89.146.30.0/27 ip4:213.144.242.0/28 ~all"	60
TXT	"OPE0067218"	60
TXT	"bw=JD9O8B5T3N8rye1GFjQP5tlEtsH7SuVOiTWPxSNk67Kr"	60
TXT	"Vrije Universiteit Amsterdam"	60
TXT	"cEePUaAdUpgbDwN8y+iChaM5q/fmwZ98byweLOwQQTzlfZ7ZqiRmUZy9plWcraR+SpUS7soZ99JhnT3uRkW0uA=="	60
TXT	"apple-domain-verification=CQxBk5H2cH0MlovF"	60
TXT	"successfactors-site-verification=NDVmYTkwNzVjMjQ3NDgwYTRiNTZiYjM4YWY0MjUwNjE4NDE1NzAyYjVkZDAxYzU4ZDBkNWNiMjg5OTFkYTYxYg=="	60
TXT	"Address: De Boelelaan 1105, 1081 HV Amsterdam"	60
TXT	"jamf-site-verification=mTKqAuu3KFc2rfzUgyBWng"	60
TXT	"ZOOM_verify_gOlFjB0bTXauhCZZfZ0SZA"	60
TXT	"MS=ms33278211"	60
TXT	"Phone: +31 20 5985385"	60
TXT	"935e51b8-957b-486c-bca0-52db87534023"	60
TXT	"google-site-verification=5wBwCtzHALiL0eFj_8LfcLtC9A0pwqF8ChcfKHGWeUg"	60
TXT	"B8RKMH5ZV1ICEXRNIUXA04C1D4UXWARTPQE3T8PTL"	60
TXT	"MS=ms11195063"	60
CAA	0 issue "letsencrypt.org"	300
CAA	0 issue "harica.gr"	300
CAA	0 issuewild "harica.gr"	300
CAA	0 issue "pki.goog; cansignhttpexchanges=yes"	300
CAA	0 iodef "mailto:socc@vu.nl"	300
CAA	0 issue "digicert.com"	300

Checks

✓ TTLs within range #32

TTLs: A 10m, MX 1d, NS 8h. The NS TTL at the parent is 1h and in the zone 8h; 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, pki.goog, digicert.com.