Domain report: ziggo.nl

Registration

info

.nl country-code

Found

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

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

#3

Delegation

info

ns1.upc.biz, ns2.upc.biz, ns3.upc.biz

Found

Parent zone: nl
Delegation from: ns1.dns.nl (194.0.28.53)
NS at the parent: ns1.upc.biz, ns2.upc.biz, ns3.upc.biz
NS in the zone: ns1.upc.biz, ns2.upc.biz, ns3.upc.biz

Nameserver	Addresses	Network (AS)	Glue
ns1.upc.biz	195.34.133.133 2001:730:3e12::133	AS6830 LibertyGlobal - Liberty Global Europe Holding B.V., NL AS6830 LibertyGlobal - Liberty Global Europe Holding B.V., NL	-
ns2.upc.biz	213.47.222.133 2001:730:3e12:1000::133	AS6830 LibertyGlobal - Liberty Global Europe Holding B.V., NL AS6830 LibertyGlobal - Liberty Global Europe Holding B.V., NL	-
ns3.upc.biz	195.20.106.133 2001:678:2e4::133	AS31079 LGI - Liberty Global Europe Holding B.V., NL AS31079 LGI - Liberty Global Europe Holding B.V., NL	-

Checks

✓ 3 nameservers #6

Delegated to ns1.upc.biz, ns2.upc.biz, ns3.upc.biz.
✓ 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: AS31079 (LGI - Liberty Global Europe Holding B.V., NL): 2 addresses; AS6830 (LibertyGlobal - Liberty Global Europe Holding B.V., NL): 4 addresses.
i

All nameserver names under .biz

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
✓ All reachable over IPv6 #13

Every nameserver has an IPv6 address.

Nameservers

info

6 of 6 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns1.upc.biz 195.34.133.133	NOERROR, 18 ms, authoritative	no	yes / yes	refused	Liberty Global DNS (31004)
ns1.upc.biz 2001:730:3e12::133	NOERROR, 11 ms, authoritative	no	yes / yes	refused	Liberty Global DNS (31004)
ns2.upc.biz 213.47.222.133	NOERROR, 3 ms, authoritative	no	yes / yes	refused	Liberty Global DNS (49001)
ns2.upc.biz 2001:730:3e12:1000::133	NOERROR, 16 ms, authoritative	no	yes / yes	refused	Liberty Global DNS (41101)
ns3.upc.biz 195.20.106.133	NOERROR, 3 ms, authoritative	no	yes / yes	refused	Liberty Global DNS (49003)
ns3.upc.biz 2001:678:2e4::133	NOERROR, 13 ms, authoritative	no	yes / yes	refused	Liberty Global DNS (31292)

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.
i

Identifying string disclosed

These nameservers answer version queries with a string that is not a version number: ns1.upc.biz: "Liberty Global DNS (31004)"; ns2.upc.biz: "Liberty Global DNS (49001)"; ns2.upc.biz: "Liberty Global DNS (41101)"; ns3.upc.biz: "Liberty Global DNS (49003)"; ns3.upc.biz: "Liberty Global DNS (31292)".

#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 2026101901 · primary ns1.upc.biz

Found

Primary (MNAME): ns1.upc.biz
Contact (RNAME): digitaldomainoffice.vodafoneziggo.com
Serial: 2026101901
Refresh / retry: 14400 s / 3600 s
Expire: 2419200 s
Negative TTL: 10800 s

Serial per nameserver

Nameserver	Serial
ns1.upc.biz (195.34.133.133)	2026101901
ns1.upc.biz (2001:730:3e12::133)	2026101901
ns2.upc.biz (213.47.222.133)	2026101901
ns2.upc.biz (2001:730:3e12:1000::133)	2026101901
ns3.upc.biz (195.20.106.133)	2026101901
ns3.upc.biz (2001:678:2e4::133)	2026101901

Checks

✓ Serial 2026101901 everywhere #22

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

SOA refresh 4h, retry 1h, expire 28d, negative TTL 3h.
✓ Primary is a public nameserver #24

The primary nameserver ns1.upc.biz is one of the listed nameservers.
✓ Contact digitaldomainoffice@vodafoneziggo.com #25

The SOA RNAME digitaldomainoffice.vodafoneziggo.com means digitaldomainoffice@vodafoneziggo.com.
✓ Date-based serial #26

The serial 2026101901 follows the YYYYMMDDnn convention (2026-10-19).

DNSSEC

info

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC
Signatures valid until: 29 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
723	ECDSAP256SHA256 (13)	SHA256 3D4B86BDB9491F7C…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
723	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 723 (SHA256).
✓ Modern algorithms #29

Key algorithms: ECDSAP256SHA256 (13).
✓ Signatures valid until 2026-10-29 #30

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

NSEC

The zone uses NSEC, so its full contents can be listed by walking the NSEC chain. That is fine unless the names are sensitive.

#31

Records

info

20 records at the apex

Found

Read from: 195.34.133.133:53

Type	Value	TTL
SOA	ns1.upc.biz. digitaldomainoffice.vodafoneziggo.com. 2026101901 14400 3600 2419200 10800	86400
NS	ns1.upc.biz.	3600
NS	ns3.upc.biz.	3600
NS	ns2.upc.biz.	3600
A	213.46.237.24	300
MX	10 mxin5.ziggo.nl.	600
MX	10 mxin10.ziggo.nl.	600
TXT	"_9z3c7kxlhwtrmsd2vljsc4sgyu8t7ym"	3600
TXT	"google-site-verification=TgBrPlsGzQ4O1Lm1F-nVFOm2CASOW6tNcPvqEnljpao"	3600
TXT	"_w5ge9okwld2ycitlpgopj198urxmrvv"	3600
TXT	"google-site-verification=tA532a9TGvhn8bRA_PF02WlxRU9kcKPGxIGJwJqeOe4"	3600
TXT	"v=spf1 include:smtp.spf.ziggo.nl include:mail.ziggo.com ~all"	3600
TXT	"google-site-verification=5LAgXfYn5IJq79X1Qe1uoN1yxGkFyEBNFmqoEqIvM5s"	3600
TXT	"_gabsz71bxmqrrgfgagpfuqgjkxt2fyw"	3600
TXT	"google-site-verification=Kmcfu4lVEJWpD-xXsWazmgSUs6_vdzUzlaTuQOdtj_U"	3600
CAA	0 iodef "mailto:digitaldomainoffice@vodafoneziggo.com"	3600
CAA	0 issuewild ";"	3600
CAA	0 issue "digicert.com"	3600
CAA	0 issue "globalsign.com"	3600
CAA	0 issue "sectigo.com"	3600

Checks

✓ TTLs within range #32

TTLs: A 5m, MX 10m, 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
✓ CAA restricts issuance #35

Certificates may be issued by: none (issuance forbidden), digicert.com, globalsign.com, sectigo.com.