Domain report: zwolle.nl

Registration

info

.nl country-code

Found

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

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

#3

Delegation

pass

nsauth1.introweb.nl, nsauth2.introweb.nl, nsauth3.introweb.net

Found

Parent zone: nl
Delegation from: ns1.dns.nl (194.0.28.53)
NS at the parent: nsauth1.introweb.nl, nsauth2.introweb.nl, nsauth3.introweb.net
NS in the zone: nsauth1.introweb.nl, nsauth2.introweb.nl, nsauth3.introweb.net

Nameserver	Addresses	Network (AS)	Glue
nsauth1.introweb.nl	80.65.96.48 2001:1690:1:a::a	AS20847 PREVIDER-AS - Previder B.V., NL AS20847 PREVIDER-AS - Previder B.V., NL	80.65.96.48 2001:1690:1:a::a
nsauth2.introweb.nl	86.105.160.91 2a0d:8600:1::5a	AS205185 DCSPINE - Eurofiber Cloud Infra B.V., NL AS205185 DCSPINE - Eurofiber Cloud Infra B.V., NL	86.105.160.91 2a0d:8600:1::5a
nsauth3.introweb.net	62.165.127.221 2001:1690:1:c::a	AS20847 PREVIDER-AS - Previder B.V., NL AS20847 PREVIDER-AS - Previder B.V., NL	-

Checks

✓ 3 nameservers #6

Delegated to nsauth1.introweb.nl, nsauth2.introweb.nl, nsauth3.introweb.net.
✓ 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 3 IPv4 /24s and 2 IPv6 /48s.
✓ 2 autonomous systems #11

The nameservers are spread over: AS205185 (DCSPINE - Eurofiber Cloud Infra B.V., NL): 2 addresses; AS20847 (PREVIDER-AS - Previder B.V., NL): 4 addresses.
✓ Nameserver names under 2 TLDs #12

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

Every nameserver has an IPv6 address.

Nameservers

warn

6 of 6 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
nsauth1.introweb.nl 80.65.96.48	NOERROR, 11 ms, authoritative	no	yes / yes	refused	PowerDNS 3.11 for Workgroups
nsauth1.introweb.nl 2001:1690:1:a::a	NOERROR, 11 ms, authoritative	no	yes / yes	refused	PowerDNS 3.11 for Workgroups
nsauth2.introweb.nl 86.105.160.91	NOERROR, 13 ms, authoritative	no	yes / yes	refused	PowerDNS 3.11 for Workgroups
nsauth2.introweb.nl 2a0d:8600:1::5a	NOERROR, 13 ms, authoritative	no	yes / yes	refused	PowerDNS 3.11 for Workgroups
nsauth3.introweb.net 62.165.127.221	NOERROR, 11 ms, authoritative	no	yes / yes	refused	PowerDNS 3.11 for Workgroups
nsauth3.introweb.net 2001:1690:1:c::a	NOERROR, 11 ms, authoritative	no	yes / yes	refused	PowerDNS 3.11 for Workgroups

Checks

✓ All respond #14

All 6 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.
!

Software version disclosed

These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: nsauth1.introweb.nl: "PowerDNS 3.11 for Workgroups"; nsauth2.introweb.nl: "PowerDNS 3.11 for Workgroups"; nsauth3.introweb.net: "PowerDNS 3.11 for Workgroups". Hide or replace the version string.

#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 2023020201 · primary nsauth1.introweb.nl

Found

Primary (MNAME): nsauth1.introweb.nl
Contact (RNAME): postmaster.introweb.nl
Serial: 2023020201
Refresh / retry: 28800 s / 7200 s
Expire: 604800 s
Negative TTL: 86400 s

Serial per nameserver

Nameserver	Serial
nsauth1.introweb.nl (80.65.96.48)	2023020201
nsauth1.introweb.nl (2001:1690:1:a::a)	2023020201
nsauth2.introweb.nl (86.105.160.91)	2023020201
nsauth2.introweb.nl (2a0d:8600:1::5a)	2023020201
nsauth3.introweb.net (62.165.127.221)	2023020201
nsauth3.introweb.net (2001:1690:1:c::a)	2023020201

Checks

✓ Serial 2023020201 everywhere #22

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

SOA refresh 8h, retry 2h, expire 7d, negative TTL 1d.
✓ Primary is a public nameserver #24

The primary nameserver nsauth1.introweb.nl is one of the listed nameservers.
✓ Contact postmaster@introweb.nl #25

The SOA RNAME postmaster.introweb.nl means postmaster@introweb.nl.
✓ Date-based serial #26

The serial 2023020201 follows the YYYYMMDDnn convention (2023-02-02).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 1 iterations, 1-byte salt
Signatures valid until: 29 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
45823	RSASHA256 (8)	SHA256 402B5BFCD485E060…	yes
30487	RSASHA256 (8)	SHA256 1551F0BF87517668…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
30487	KSK (257)	RSASHA256 (8)
45823	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 45823 (SHA256), key tag 30487 (SHA256).
✓ Modern algorithms #29

Key algorithms: RSASHA256 (8).
✓ Signatures valid until 2026-10-29 #30

The earliest DNSKEY/SOA signature expires at 2026-10-29 00:00 UTC.
!

NSEC3 with extra iterations or salt

NSEC3 uses 1 iteration and a 1-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

18 records at the apex

Found

Read from: 80.65.96.48:53

Type	Value	TTL
SOA	nsauth1.introweb.nl. postmaster.introweb.nl. 2023020201 28800 7200 604800 86400	3600
NS	nsauth1.introweb.nl.	3600
NS	nsauth2.introweb.nl.	3600
NS	nsauth3.introweb.net.	3600
A	20.56.66.61	300
MX	10 zwolle-nl.c-v1.mx.microsoft.	3600
TXT	"miro-verification=9a0ff0a02931a95edd59c165679beb65bc90a7c4"	3600
TXT	"_globalsign-domain-verification=GtzjG2CvGUIIi3Wl9wBLv6HOPogjl1Jy8CUXxKitWy"	3600
TXT	"0bac9743-1458-4fbf-8b61-e5718bd2c574-22102019"	3600
TXT	"MS=ms70860589"	3600
TXT	"nOC3SKQPvq02FwOHKxPBtlsqq2+2wWyCzZr+dnc2fyvFdm7vr0LtK1PLEzPmT4LkYWPP15rZT0QUMtbgx5SEqg=="	3600
TXT	"mczXZ0gueKGEeOxuhE6mi1QiwG1sMo9J8baKOWJD5QM="	3600
TXT	"aa1dd37f-8b1a-4491-89fe-aacf4615c6bb-06092019"	3600
TXT	"google-site-verification=UvLnKXIvO-1jd9-p79-smQ8YVoF7xU8doUgiEKKyvSo"	3600
TXT	"DomainVerification=P6GJ19YQJ73LF1MROUUHK2FMMWEYCMTVL6R0I9F54Y4EGS8KT63PXACLN6NFWZYK"	3600
TXT	"mtzchj2577hl01t6rcqmtlh9wjsjl8nl"	3600
TXT	"Y93Z00OgFi3ykJJks4i/OjpMk5hzM+DLJuRwDsCbvUNnECDbASOYU24V5QAu+k3pRxlBcNBKU13uoV6OtaY/GQ=="	3600
TXT	"v=spf1 include:4zoq22t2ww.powerspf.com include:spf.protection.outlook.com ~all"	3600

Checks

✓ TTLs within range #32

TTLs: A 5m, 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