Domain report: tele2.nl

Registration

info

.nl country-code

Found

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

Lookup error: https://rdap.sidn.nl/domain/tele2.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/tele2.nl returned HTTP 429

#3

Delegation

info

falun.dns.swip.net, kalmar.dns.swip.net

Found

Parent zone: nl
Delegation from: ns1.dns.nl (194.0.28.53)
NS at the parent: falun.dns.swip.net, kalmar.dns.swip.net
NS in the zone: falun.dns.swip.net, kalmar.dns.swip.net

Nameserver	Addresses	Network (AS)	Glue
falun.dns.swip.net	192.71.220.13 2a00:801:103:8::f00d	AS1257 SWIPNET - Tele2 Sverige AB, EU AS1257 SWIPNET - Tele2 Sverige AB, EU	-
kalmar.dns.swip.net	192.71.180.46 2a00:801:103:f::beef	AS1257 SWIPNET - Tele2 Sverige AB, EU AS1257 SWIPNET - Tele2 Sverige AB, EU	-

Checks

i

2 nameservers

Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: falun.dns.swip.net, kalmar.dns.swip.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.
i

One address family in one network

all IPv6 addresses are in 2a00:801:103::/48, while the other address family is spread over several networks.

#10
i

All nameservers in one AS

All nameserver addresses are announced by one network operator (AS1257 (SWIPNET - Tele2 Sverige AB, EU): 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
i

All nameserver names under .net

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

pass

4 of 4 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
falun.dns.swip.net 192.71.220.13	NOERROR, 21 ms, authoritative	no	yes / yes	refused	-
falun.dns.swip.net 2a00:801:103:8::f00d	NOERROR, 22 ms, authoritative	no	yes / yes	refused	-
kalmar.dns.swip.net 192.71.180.46	NOERROR, 30 ms, authoritative	no	yes / yes	refused	-
kalmar.dns.swip.net 2a00:801:103:f::beef	NOERROR, 30 ms, authoritative	no	yes / yes	refused	-

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.
✓ 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

pass

serial 2026102111 · primary falun.dns.swip.net

Found

Primary (MNAME): falun.dns.swip.net
Contact (RNAME): hostmaster.tele2.com
Serial: 2026102111
Refresh / retry: 28800 s / 7200 s
Expire: 604800 s
Negative TTL: 3600 s

Serial per nameserver

Nameserver	Serial
falun.dns.swip.net (192.71.220.13)	2026102111
falun.dns.swip.net (2a00:801:103:8::f00d)	2026102111
kalmar.dns.swip.net (192.71.180.46)	2026102111
kalmar.dns.swip.net (2a00:801:103:f::beef)	2026102111

Checks

✓ Serial 2026102111 everywhere #22

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

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

The primary nameserver falun.dns.swip.net is one of the listed nameservers.
✓ Contact hostmaster@tele2.com #25

The SOA RNAME hostmaster.tele2.com means hostmaster@tele2.com.
✓ Date-based serial #26

The serial 2026102111 follows the YYYYMMDDnn convention (2026-10-21).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 5 iterations, 8-byte salt
Signatures valid until: 2 November 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
7619	RSASHA256 (8)	SHA256 28D1CCC51DEEC683…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
7619	KSK (257)	RSASHA256 (8)
61344	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 7619 (SHA256).
✓ Modern algorithms #29

Key algorithms: RSASHA256 (8).
✓ Signatures valid until 2026-11-02 #30

The earliest DNSKEY/SOA signature expires at 2026-11-02 20:37 UTC.
!

NSEC3 with extra iterations or salt

NSEC3 uses 5 iterations and a 8-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

warn

12 records at the apex

Found

Read from: 192.71.220.13:53

Type	Value	TTL
SOA	falun.dns.swip.net. hostmaster.tele2.com. 2026102111 28800 7200 604800 3600	3600
NS	kalmar.dns.swip.net.	600
NS	falun.dns.swip.net.	600
A	20.105.224.89	300
A	20.50.2.46	300
MX	10 mx10.se.isp-net.nl.	30
MX	20 mx20.se.isp-net.nl.	30
TXT	"_qguxj7k70t3v6lhdc7bzg27zn16j4wg"	3600
TXT	"v=spf1 include:mailplus.nl include:_spf_mx.solvinity.com include:spf.flowmailer.net include:spf1.tripolis.com include:spf2.tripolis.com include:spf.slgnt.eu ip4:212.247.154.0/23 ip4:212.247.156.0/27 ip4:94.103.21.49 ip4:94.103.21.65 ip4:193.12.60.45 ip4:1" "93.12.60.46 ip4:193.12.60.47 ip4:193.12.60.48 ip4:62.58.50.0/24 ip4:82.215.18.0/28 ip4:82.215.18.96/28 ip4:217.149.218.0/24 ip4:62.58.48.0/24 ip4:188.190.114.141 ip4:188.190.114.142 ~all"	3600
CAA	0 issue "amazon.com"	3600
CAA	0 issue "digicert.com"	3600
CAA	0 issue "sectigo.com"	3600

Checks

!

Very low TTLs

These records have a TTL below 5m, causing extra queries and slower lookups: MX (30s). Low TTLs are useful just before a planned change. The NS TTL at the parent is 1h and in the zone 10m; resolvers may use either.

#32
✓ 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: amazon.com, digicert.com, sectigo.com.