Domain report: threema.com

Registration

info

.com generic · COREhub, S.R.L. · expires 2027-10-21

Found

TLD: .com (generic)
ICANN policies apply: yes
Registrar: COREhub, S.R.L.
Registered: 21 October 2012
Last changed: 22 October 2026
Expires: 21 October 2027
Status: client delete prohibited, client transfer prohibited
Registry nameservers: ns1.threema.ch, ns2.threema.ch, ns5.threema.ch
RDAP server: https://rdap.verisign.com/com/v1/

Checks

i

.com is a generic TLD (gTLD)

Generic TLD under an ICANN registry agreement: ICANN-accredited registrars, UDRP and RDAP apply.

#1
✓ TLD delegated and signed #2

.com is delegated in the root zone and DNSSEC-signed.
✓ Expires on 2027-10-21 #3

The registration is valid until 2027-10-21 (364 days).
✓ Transfer locked #4

Registry status: client delete prohibited, client transfer prohibited.
✓ Registry and delegation match #5

The nameservers registered at the registry are the ones published in DNS.

Delegation

info

ns1.threema.ch, ns2.threema.ch, ns5.threema.ch

Found

Parent zone: com
Delegation from: a.gtld-servers.net (192.5.6.30)
NS at the parent: ns1.threema.ch, ns2.threema.ch, ns5.threema.ch
NS in the zone: ns1.threema.ch, ns2.threema.ch, ns5.threema.ch

Nameserver	Addresses	Network (AS)	Glue
ns1.threema.ch	203.56.112.65 2a14:3e40:112:312::65	AS29691 NINE - Nine Internet Solutions AG, CH AS29691 NINE - Nine Internet Solutions AG, CH	-
ns2.threema.ch	203.56.114.65 2a14:3e44:114:314::65	AS15576 NTS - NTS workspace AG, CH AS15576 NTS - NTS workspace AG, CH	-
ns5.threema.ch	194.182.188.180 2a04:c44:e00:b134:45f:56ff:fe00:1194	AS61098 exoscale - Akenes SA, CH AS61098 exoscale - Akenes SA, CH	-

Checks

✓ 3 nameservers #6

Delegated to ns1.threema.ch, ns2.threema.ch, ns5.threema.ch.
✓ 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 3 IPv6 /48s.
✓ 3 autonomous systems #11

The nameservers are spread over: AS15576 (NTS - NTS workspace AG, CH): 2 addresses; AS29691 (NINE - Nine Internet Solutions AG, CH): 2 addresses; AS61098 (exoscale - Akenes SA, CH): 2 addresses.
i

All nameserver names under .ch

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.threema.ch 203.56.112.65	NOERROR, 8 ms, authoritative	no	yes / yes	refused	No version information available (refused).
ns1.threema.ch 2a14:3e40:112:312::65	NOERROR, 9 ms, authoritative	no	yes / yes	refused	No version information available (refused).
ns2.threema.ch 203.56.114.65	NOERROR, 23 ms, authoritative	no	yes / yes	refused	No version information available (refused).
ns2.threema.ch 2a14:3e44:114:314::65	NOERROR, 24 ms, authoritative	no	yes / yes	refused	No version information available (refused).
ns5.threema.ch 194.182.188.180	NOERROR, 9 ms, authoritative	no	yes / yes	refused	No version information available (refused).
ns5.threema.ch 2a04:c44:e00:b134:45f:56ff:fe00:1194	NOERROR, 9 ms, authoritative	no	yes / yes	refused	No version information available (refused).

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.threema.ch: "No version information available (refused)."; ns2.threema.ch: "No version information available (refused)."; ns5.threema.ch: "No version information available (refused).".

#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 2026102201 · primary ns1.threema.ch

Found

Primary (MNAME): ns1.threema.ch
Contact (RNAME): hostmaster.threema.ch
Serial: 2026102201
Refresh / retry: 10800 s / 900 s
Expire: 604800 s
Negative TTL: 3600 s

Serial per nameserver

Nameserver	Serial
ns1.threema.ch (203.56.112.65)	2026102201
ns1.threema.ch (2a14:3e40:112:312::65)	2026102201
ns2.threema.ch (203.56.114.65)	2026102201
ns2.threema.ch (2a14:3e44:114:314::65)	2026102201
ns5.threema.ch (194.182.188.180)	2026102201
ns5.threema.ch (2a04:c44:e00:b134:45f:56ff:fe00:1194)	2026102201

Checks

✓ Serial 2026102201 everywhere #22

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

SOA refresh 3h, retry 15m, expire 7d, negative TTL 1h.
✓ Primary is a public nameserver #24

The primary nameserver ns1.threema.ch is one of the listed nameservers.
✓ Contact hostmaster@threema.ch #25

The SOA RNAME hostmaster.threema.ch means hostmaster@threema.ch.
✓ Date-based serial #26

The serial 2026102201 follows the YYYYMMDDnn convention (2026-10-22).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 0 iterations, 8-byte salt
Signatures valid until: 31 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
12240	ECDSAP256SHA256 (13)	SHA256 B69890539E131A3C…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
12240	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 12240 (SHA256).
✓ Modern algorithms #29

Key algorithms: ECDSAP256SHA256 (13).
✓ Signatures valid until 2026-10-31 #30

The earliest DNSKEY/SOA signature expires at 2026-10-31 09:31 UTC.
!

NSEC3 with extra iterations or salt

NSEC3 uses 0 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

pass

13 records at the apex

Found

Read from: 203.56.112.65:53

Type	Value	TTL
SOA	ns1.threema.ch. hostmaster.threema.ch. 2026102201 10800 900 604800 3600	3600
NS	ns5.threema.ch.	3600
NS	ns2.threema.ch.	3600
NS	ns1.threema.ch.	3600
A	203.56.112.78	300
AAAA	2a14:3e40:112:312::78	300
TXT	"v=spf1 -all"	300
TXT	"dbf37de8b6f793a18828fb4fbdd451b6"	300
TXT	"google-site-verification=0JtLfG4Qk0bhvlyCU9HqmlfWaUcOZX8nkWctdblaFf4"	300
CAA	0 issue "trust-provider.com"	3600
CAA	0 issue "comodoca.com"	3600
CAA	0 iodef "mailto:security@threema.ch"	3600
CAA	0 issue "sectigo.com"	3600

Checks

✓ TTLs within range #32

TTLs: A 5m, AAAA 5m, NS 1h. The NS TTL at the parent is 2d and in the zone 1h; 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: trust-provider.com, comodoca.com, sectigo.com.