Domain report: maastricht.nl

Registration

info

.nl country-code

Found

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

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

#3

Delegation

info

sec1.rcode0.eu, sec2.rcode0.net

Found

Parent zone: nl
Delegation from: ns1.dns.nl (194.0.28.53)
NS at the parent: sec1.rcode0.eu, sec2.rcode0.net
NS in the zone: sec1.rcode0.eu, sec2.rcode0.net

Nameserver	Addresses	Network (AS)	Glue
sec1.rcode0.eu	192.174.68.100 2001:67c:1bc::100	AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT	-
sec2.rcode0.net	176.97.158.100 2001:67c:10b8::100	AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT	-

Checks

i

2 nameservers

Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: sec1.rcode0.eu, sec2.rcode0.net.

#6
✓ 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.
✓ Nameservers in different networks #10

The nameservers are spread over 2 IPv4 /24s and 2 IPv6 /48s.
i

All nameservers in one AS

All nameserver addresses are announced by one network operator (AS1921 (RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT): 4 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.

#11
✓ Nameserver names under 2 TLDs #12

Nameserver names use the TLDs .eu, .net.
✓ All reachable over IPv6 #13

Every nameserver has an IPv6 address.

Nameservers

info

4 of 4 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
sec1.rcode0.eu 192.174.68.100	NOERROR, 3 ms, authoritative	no	yes / yes	refused	RcodeZero DNS
sec1.rcode0.eu 2001:67c:1bc::100	NOERROR, 4 ms, authoritative	no	yes / yes	refused	RcodeZero DNS
sec2.rcode0.net 176.97.158.100	NOERROR, 13 ms, authoritative	no	yes / yes	refused	reg-wie1
sec2.rcode0.net 2001:67c:10b8::100	NOERROR, 13 ms, authoritative	no	yes / yes	refused	reg-wie1

Checks

✓ All respond #14

All 4 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: sec1.rcode0.eu: "RcodeZero DNS"; sec2.rcode0.net: "reg-wie1".

#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

warn

serial 2026103065 · primary sec1.rcode0.eu

Found

Primary (MNAME): sec1.rcode0.eu
Contact (RNAME): postmaster.maastricht.nl
Serial: 2026103065
Refresh / retry: 10800 s / 3600 s
Expire: 604800 s
Negative TTL: 30 s

Serial per nameserver

Nameserver	Serial
sec1.rcode0.eu (192.174.68.100)	2026103065
sec1.rcode0.eu (2001:67c:1bc::100)	2026103065
sec2.rcode0.net (176.97.158.100)	2026103065
sec2.rcode0.net (2001:67c:10b8::100)	2026103065

Checks

✓ Serial 2026103065 everywhere #22

All nameservers serve the same version of the zone.
!

Unusual SOA timers

negative caching TTL (minimum) 30s is outside 5m–1d (RFC 2308 recommends 1–3 hours). Current values: refresh 3h, retry 1h, expire 7d, negative TTL 30s.

#23
✓ Primary is a public nameserver #24

The primary nameserver sec1.rcode0.eu is one of the listed nameservers.
✓ Contact postmaster@maastricht.nl #25

The SOA RNAME postmaster.maastricht.nl means postmaster@maastricht.nl.
!

Serial date in the future

The serial 2026103065 looks like a date (YYYYMMDDnn) in the future (2026-10-30). It can only grow, so a wrong date can't be undone without a serial wrap-around.

#26

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: 5 November 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
26564	ECDSAP256SHA256 (13)	SHA256 29A99223B804B7BF…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
17633	ZSK (256)	ECDSAP256SHA256 (13)
64542	ZSK (256)	ECDSAP256SHA256 (13)
8798	KSK (257)	ECDSAP256SHA256 (13)
26564	KSK (257)	ECDSAP256SHA256 (13)

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 26564 (SHA256).
✓ Modern algorithms #29

Key algorithms: ECDSAP256SHA256 (13).
✓ Signatures valid until 2026-11-05 #30

The earliest DNSKEY/SOA signature expires at 2026-11-05 00:00 UTC.
✓ NSEC3 as recommended #31

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

Records

pass

21 records at the apex

Found

Read from: 192.174.68.100:53

Type	Value	TTL
SOA	sec1.rcode0.eu. postmaster.maastricht.nl. 2026103065 10800 3600 604800 30	3600
NS	sec1.rcode0.eu.	300
NS	sec2.rcode0.net.	300
A	31.7.1.20	300
AAAA	2a03:9700:8000:0:b4d4:766:58bb:d21e	300
MX	10 smtp1.spzl.nl.	300
MX	20 smtp2.spzl.nl.	300
TXT	"MS=ms17355381"	300
TXT	"apple-domain-verification=0QJaXYwBNxn8KrDm"	300
TXT	"1af2816d-0fc0-4005-9de9-14f942cc69c2-26072018"	300
TXT	"QuoVadis=3f85c20d-fed9-4d58-9848-a3ec5508b7ee"	300
TXT	"QuoVadis=a52c69c7-6034-4ae7-8d57-d5a4d4a398a8"	300
TXT	"QuoVadis=f4c4ac2b-dc93-400d-9eec-9d370dec8baa"	300
TXT	"bw=2bFL0D6YKYJeQ9IO2YyZyIVM1LERzknkdDHh6L9WM6N4"	300
TXT	"duo_sso_verification=h13gqIaN0Ni2m5nMjT2KyajGlnzWo9EE0CyYOkl15IbV98BChuLmeOipJQn8QDuk"	300
TXT	"QmyTJuHyRPjI0BumDUTe22baprZjKCBaVAxZmtAT0FcWuxbm526WMgxMrsXd5rN7eaMo2wOM1R32exIooYJ3JQ=="	300
TXT	"ciscocidomainverification=34dbdca0ec617030d0bc36deee5cf3dd35df5c05bc83c9f912d9b024100d6a02"	300
TXT	"v=spf1 include:reject.spf.spzl.nl ip4:193.240.184.7 ip4:212.35.124.164 ip4:212.23.45.97 ip4:109.232.42.15 ip4:34.249.196.78 ip4:34.251.157.56 ip4:34.252.27.239 ip4:35.157.154.159 ip4:35.157.187.101 " " ip4:195.20.144.0/24 include:_spf.imanager.nl include:servers.mcsv.net include:_spf.aanmelder.nl include:spf.protection.outlook.com -all"	300
CAA	0 iodef "mailto:soc@maastricht.nl"	300
CAA	0 issue "digicert.com"	300
CAA	0 issuewild "digicert.com"	300

Checks

✓ TTLs within range #32

TTLs: A 5m, AAAA 5m, MX 5m, NS 5m. The NS TTL at the parent is 1h and in the zone 5m; 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: digicert.com.