Domain report: hro.nl

Registration

info

.nl country-code

Found

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

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

#3

Delegation

warn

dns-01.hro.nl, dns-02.hro.nl

Found

Parent zone: nl
Delegation from: ns1.dns.nl (194.0.28.53)
NS at the parent: dns-01.hro.nl, dns-02.hro.nl
NS in the zone: dns-01.hro.nl, dns-02.hro.nl

Nameserver	Addresses	Network (AS)	Glue
dns-01.hro.nl	145.24.1.204	AS1103 SURFNET-NL - SURF B.V., NL	145.24.1.204
dns-02.hro.nl	145.24.159.204	AS1103 SURFNET-NL - SURF B.V., NL	145.24.159.204

Checks

i

2 nameservers

Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: dns-01.hro.nl, dns-02.hro.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: dns-01.hro.nl, dns-02.hro.nl.
✓ 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 2 IPv4 /24s and 0 IPv6 /48s.
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

pass

2 of 2 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
dns-01.hro.nl 145.24.1.204	NOERROR, 13 ms, authoritative	no	yes / yes	refused	-
dns-02.hro.nl 145.24.159.204	NOERROR, 14 ms, authoritative	no	yes / yes	refused	-

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.
✓ 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

info

serial 2026102365 · primary ib-gm-mgmt.hro.nl

Found

Primary (MNAME): ib-gm-mgmt.hro.nl
Contact (RNAME): hostmaster.hro.nl
Serial: 2026102365
Refresh / retry: 10800 s / 3600 s
Expire: 2419200 s
Negative TTL: 900 s

Serial per nameserver

Nameserver	Serial
dns-01.hro.nl (145.24.1.204)	2026102365
dns-02.hro.nl (145.24.159.204)	2026102365

Checks

✓ Serial 2026102365 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 ib-gm-mgmt.hro.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@hro.nl #25

The SOA RNAME hostmaster.hro.nl means hostmaster@hro.nl.
✓ Date-based serial #26

The serial 2026102365 follows the YYYYMMDDnn convention (2026-10-23).

DNSSEC

pass

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 0 iterations, 0-byte salt
Signatures valid until: 26 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
51536	RSASHA256 (8)	SHA256 1C859D5716B4576A…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
49729	ZSK (256)	RSASHA256 (8)
27696	ZSK (256)	RSASHA256 (8)
51536	KSK (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 51536 (SHA256).
✓ Modern algorithms #29

Key algorithms: RSASHA256 (8).
✓ Short-lived signatures (online signing) #30

Signatures are valid for 96h0m0s and created on demand; the current one was made at 2026-10-22 04:33 UTC and expires at 2026-10-26 04:46 UTC.
✓ NSEC3 as recommended #31

The zone uses NSEC3 with 0 iterations and no salt (RFC 9276).

Records

pass

20 records at the apex

Found

Read from: 145.24.1.204:53

Type	Value	TTL
SOA	ib-gm-mgmt.hro.nl. hostmaster.hro.nl. 2026102365 10800 3600 2419200 900	28800
NS	dns-01.hro.nl.	28800
NS	dns-02.hro.nl.	28800
A	145.24.159.123	3600
MX	100 suffix04.hro.nl.	3600
MX	100 suffix03.hro.nl.	3600
MX	100 suffix02.hro.nl.	3600
MX	100 suffix01.hro.nl.	3600
MX	100 suffix06.hro.nl.	3600
MX	100 suffix05.hro.nl.	3600
TXT	"Hogeschool Rotterdam, University of Professional Education"	3600
TXT	"ZOOM_verify_N6fepCVGQo-DFyH-mXXucw"	3600
TXT	"HARICA-ZXl8qh9qmfojk1mZ22P"	3600
TXT	"v=spf1 redirect=hr.nl"	3600
TXT	"dTBWsJpASBH2i077Y1iHr05C9uV8aoyn++LGBRbfkUiUvkqab8DFF7mmHF/V4AaJ7h/JHx1gyZFb10LHvQnFtQ=="	3600
TXT	"DomainVerification=4UK2CA4GNMU2LHD343SD6JVF9QNSNLU3NN4C5C0PB5HONZQDGWT4X0ZNZN4AU2H0"	3600
TXT	"google-site-verification=6moH-YKqAnrzMXRbyby3tKNq_KaUVJomPuZNbKaDcuw"	3600
TXT	"yahoo-verification-key=JAWb8rZHvcpxYTxQ0IPFO2B2G6UWMcJr7cIFATZKe2I="	3600
CAA	0 iodef "mailto:caa-reports@hr.nl"	3600
CAA	0 issue "harica.gr"	3600

Checks

✓ TTLs within range #32

TTLs: A 1h, MX 1h, 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: harica.gr.