Domain report: umcn.nl

Registration

info

.nl country-code

Found

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

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

#3

Delegation

info

ns1.surfnet.nl, ns1.zurich.surf.net, umcdns05.umcn.nl

Found

Parent zone: nl
Delegation from: ns1.dns.nl (194.0.28.53)
NS at the parent: ns1.surfnet.nl, ns1.zurich.surf.net, umcdns05.umcn.nl
NS in the zone: ns1.surfnet.nl, ns1.zurich.surf.net, umcdns05.umcn.nl

Nameserver	Addresses	Network (AS)	Glue
ns1.surfnet.nl	192.87.106.101 2001:610:1:800a:192:87:106:101	AS1103 SURFNET-NL - SURF B.V., NL AS1103 SURFNET-NL - SURF B.V., NL	192.87.106.101 2001:610:1:800a:192:87:106:101
ns1.zurich.surf.net	195.176.255.9 2001:620:0:9::1103	AS559 Switch - SWITCH, CH AS559 Switch - SWITCH, CH	-
umcdns05.umcn.nl	131.174.165.10	AS1103 SURFNET-NL - SURF B.V., NL	131.174.165.10

Checks

✓ 3 nameservers #6

Delegated to ns1.surfnet.nl, ns1.zurich.surf.net, umcdns05.umcn.nl.
✓ 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: umcdns05.umcn.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 3 IPv4 /24s and 2 IPv6 /48s.
✓ 2 autonomous systems #11

The nameservers are spread over: AS1103 (SURFNET-NL - SURF B.V., NL): 3 addresses; AS559 (Switch - SWITCH, CH): 2 addresses.
✓ Nameserver names under 2 TLDs #12

Nameserver names use the TLDs .net, .nl.
i

Partly IPv6

These nameservers have no IPv6 address: umcdns05.umcn.nl.

#13

Nameservers

info

5 of 5 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns1.surfnet.nl 192.87.106.101	NOERROR, 10 ms, authoritative	no	yes / yes	refused	This is a SURFnet nameserver - dns-beheer@surfnet.nl
ns1.surfnet.nl 2001:610:1:800a:192:87:106:101	NOERROR, 11 ms, authoritative	no	yes / yes	refused	This is a SURFnet nameserver - dns-beheer@surfnet.nl
ns1.zurich.surf.net 195.176.255.9	NOERROR, 10 ms, authoritative	no	yes / yes	refused	This is a SURFnet nameserver - dns-beheer@surf.nl
ns1.zurich.surf.net 2001:620:0:9::1103	NOERROR, 10 ms, authoritative	no	yes / yes	refused	This is a SURFnet nameserver - dns-beheer@surf.nl
umcdns05.umcn.nl 131.174.165.10	NOERROR, 14 ms, authoritative	no	yes / yes	refused	-

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: ns1.surfnet.nl: "This is a SURFnet nameserver - dns-beheer@surfnet.nl"; ns1.zurich.surf.net: "This is a SURFnet nameserver - dns-beheer@surf.nl".

#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 2019400126 · primary umcdns05.umcn.nl

Found

Primary (MNAME): umcdns05.umcn.nl
Contact (RNAME): netwerkbeheerict.radboudumc.nl
Serial: 2019400126
Refresh / retry: 10800 s / 1080 s
Expire: 2419200 s
Negative TTL: 900 s

Serial per nameserver

Nameserver	Serial
ns1.surfnet.nl (192.87.106.101)	2019400126
ns1.surfnet.nl (2001:610:1:800a:192:87:106:101)	2019400126
ns1.zurich.surf.net (195.176.255.9)	2019400126
ns1.zurich.surf.net (2001:620:0:9::1103)	2019400126
umcdns05.umcn.nl (131.174.165.10)	2019400126

Checks

✓ Serial 2019400126 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 umcdns05.umcn.nl is one of the listed nameservers.
✓ Contact netwerkbeheerict@radboudumc.nl #25

The SOA RNAME netwerkbeheerict.radboudumc.nl means netwerkbeheerict@radboudumc.nl.
✓ Timestamp serial #26

The serial 2019400126 is a Unix timestamp (2033-12-28 16:28 UTC).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 10 iterations, 6-byte salt
Signatures valid until: 26 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
46591	RSASHA512 (10)	SHA256 52AEE505FD127B36…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
46591	KSK (257)	RSASHA512 (10)
16427	ZSK (256)	RSASHA512 (10)
50757	ZSK (256)	RSASHA512 (10)
57468	ZSK (256)	RSASHA512 (10)
3891	KSK (257)	RSASHA512 (10)
6443	ZSK (256)	RSASHA512 (10)

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 46591 (SHA256).
✓ Modern algorithms #29

Key algorithms: RSASHA512 (10).
✓ Short-lived signatures (online signing) #30

Signatures are valid for 96h0m0s and created on demand; the current one was made at 2026-10-22 14:23 UTC and expires at 2026-10-26 14:28 UTC.
!

NSEC3 with extra iterations or salt

NSEC3 uses 10 iterations and a 6-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

11 records at the apex

Found

Read from: 192.87.106.101:53

Type	Value	TTL
SOA	umcdns05.umcn.nl. netwerkbeheerict.radboudumc.nl. 2019400126 10800 1080 2419200 900	3600
NS	umcdns05.umcn.nl.	3600
NS	ns1.surfnet.nl.	3600
NS	ns1.zurich.surf.net.	3600
A	131.174.154.47	3600
MX	10 umcn-nl.mail.protection.outlook.com.	3600
TXT	"v=spf1 include:spf.protection.outlook.com ip4:131.174.160.96/28 ip4:131.174.165.0/24 ip4:131.174.244.11 include:spf1.radboudumc.nl -all"	3600
TXT	"HARICA-kep5WZr6oY1HmWtjEcY"	3600
TXT	"apple-domain-verification=aev6TydbndMztZCA"	3600
TXT	"MS=ms86809597"	3600
TXT	"HARICA-cGRoGZdZoHaCyLrgqiO"	3600

Checks

✓ TTLs within range #32

TTLs: A 1h, MX 1h, NS 1h.
✓ No CNAME at the apex #33

The zone apex has no CNAME record.
i

Wildcard record

A random name under the zone resolves, so there is a wildcard (*) record. Typos and non-existent hosts resolve too, which can confuse mail and certificate checks.

#34
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