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Checked:
14.02.2026 05:55:08

Older results

T - 13.02.2026 23:44:29

T - 13.02.2026 23:36:40

1. IP-Addresses

Host	Type	IP-Address	is auth.	∑ Queries	∑ Timeout
portal.oigpower.cz	A	178.238.45.4 Prague/Czechia (CZ) - MasterDC s.r.o. Hostname: 178-238-45-4.static.masterinter.net	yes	1	0
	AAAA		yes
www.portal.oigpower.cz		Name Error	yes	1	0
*.oigpower.cz	A	185.25.185.29	yes
	AAAA		yes
	CNAME	oigpower.cz	yes
*.portal.oigpower.cz	A	Name Error	yes
	AAAA	Name Error	yes
	CNAME	Name Error	yes

2. DNSSEC

Zone (*)	DNSSEC - Informations

Zone: (root)
(root)	1 DS RR published


	DS with Algorithm 8, KeyTag 20326, DigestType 2 and Digest 4G1EuAuPHTmpXAsNfGXQhFjogECbvGg0VxBCN8f47I0=


	• Status: Valid because published


	3 DNSKEY RR found


	Public Key with Algorithm 8, KeyTag 20326, Flags 257 (SEP = Secure Entry Point)


	Public Key with Algorithm 8, KeyTag 21831, Flags 256


	Public Key with Algorithm 8, KeyTag 38696, Flags 257 (SEP = Secure Entry Point)


	1 RRSIG RR to validate DNSKEY RR found


	RRSIG-Owner (root), Algorithm: 8, 0 Labels, original TTL: 172800 sec, Signature-expiration: 03.03.2026, 00:00:00 +, Signature-Inception: 10.02.2026, 00:00:00 +, KeyTag 20326, Signer-Name: (root)


	• Status: Good - Algorithmus 8 and DNSKEY with KeyTag 20326 used to validate the DNSKEY RRSet


	• Status: Valid Chain of trust. Parent-DS with Algorithm 8, KeyTag 20326, DigestType 2 and Digest "4G1EuAuPHTmpXAsNfGXQhFjogECbvGg0VxBCN8f47I0=" validates local Key with the same values, Key ist Secure Entry Point (SEP) of the zone

Zone: cz
cz	1 DS RR in the parent zone found


	DS with Algorithm 13, KeyTag 20237, DigestType 2 and Digest z/Dz7NvFKcHwAxuhhAv7g1hTuSCe0eUI//SEUde3eOI=


	1 RRSIG RR to validate DS RR found


	RRSIG-Owner cz., Algorithm: 8, 1 Labels, original TTL: 86400 sec, Signature-expiration: 26.02.2026, 21:00:00 +, Signature-Inception: 13.02.2026, 20:00:00 +, KeyTag 21831, Signer-Name: (root)


	• Status: Good - Algorithmus 8 and DNSKEY with KeyTag 21831 used to validate the DS RRSet in the parent zone


	2 DNSKEY RR found


	Public Key with Algorithm 13, KeyTag 20237, Flags 257 (SEP = Secure Entry Point)


	Public Key with Algorithm 13, KeyTag 37268, Flags 256


	1 RRSIG RR to validate DNSKEY RR found


	RRSIG-Owner cz., Algorithm: 13, 1 Labels, original TTL: 3600 sec, Signature-expiration: 23.02.2026, 22:21:34 +, Signature-Inception: 09.02.2026, 20:51:34 +, KeyTag 20237, Signer-Name: cz


	• Status: Good - Algorithmus 13 and DNSKEY with KeyTag 20237 used to validate the DNSKEY RRSet


	• Status: Valid Chain of trust. Parent-DS with Algorithm 13, KeyTag 20237, DigestType 2 and Digest "z/Dz7NvFKcHwAxuhhAv7g1hTuSCe0eUI//SEUde3eOI=" validates local Key with the same values, Key ist Secure Entry Point (SEP) of the zone

Zone: oigpower.cz
oigpower.cz	1 DS RR in the parent zone found


	DS with Algorithm 10, KeyTag 46074, DigestType 2 and Digest ZXi7bzo0zwphDzSi0k0ly7wt33mRizWo89PlV011MxY=


	1 RRSIG RR to validate DS RR found


	RRSIG-Owner oigpower.cz., Algorithm: 13, 2 Labels, original TTL: 3600 sec, Signature-expiration: 23.02.2026, 17:47:17 +, Signature-Inception: 09.02.2026, 16:17:17 +, KeyTag 37268, Signer-Name: cz


	• Status: Good - Algorithmus 13 and DNSKEY with KeyTag 37268 used to validate the DS RRSet in the parent zone


	2 DNSKEY RR found


	Public Key with Algorithm 10, KeyTag 14645, Flags 256


	Public Key with Algorithm 10, KeyTag 46074, Flags 257 (SEP = Secure Entry Point)


	1 RRSIG RR to validate DNSKEY RR found


	RRSIG-Owner oigpower.cz., Algorithm: 10, 2 Labels, original TTL: 3600 sec, Signature-expiration: 15.03.2026, 14:43:01 +, Signature-Inception: 13.02.2026, 13:13:01 +, KeyTag 46074, Signer-Name: oigpower.cz


	• Status: Good - Algorithmus 10 and DNSKEY with KeyTag 46074 used to validate the DNSKEY RRSet


	• Status: Valid Chain of trust. Parent-DS with Algorithm 10, KeyTag 46074, DigestType 2 and Digest "ZXi7bzo0zwphDzSi0k0ly7wt33mRizWo89PlV011MxY=" validates local Key with the same values, Key ist Secure Entry Point (SEP) of the zone

Zone: portal.oigpower.cz
portal.oigpower.cz	0 DS RR in the parent zone found


	DS-Query in the parent zone has a valid NSEC3 RR as result with the hashed query name "o9602ltg5c8a50kl9ro0hkevnp73mi67" between the hashed NSEC3-owner "o9602ltg5c8a50kl9ro0hkevnp73mi67" and the hashed NextOwner "oeqllpsm2u5ldl32jitovp132n2u9kb3". So the parent zone confirmes the not-existence of a DS RR. Bitmap: A, RRSIG Validated: RRSIG-Owner o9602ltg5c8a50kl9ro0hkevnp73mi67.oigpower.cz., Algorithm: 10, 3 Labels, original TTL: 3600 sec, Signature-expiration: 15.03.2026, 14:43:01 +, Signature-Inception: 13.02.2026, 13:13:01 +, KeyTag 14645, Signer-Name: oigpower.cz


	0 DNSKEY RR found





	RRSIG Type 1 validates the A - Result: 178.238.45.4 Validated: RRSIG-Owner portal.oigpower.cz., Algorithm: 10, 3 Labels, original TTL: 1800 sec, Signature-expiration: 15.03.2026, 14:43:01 +, Signature-Inception: 13.02.2026, 13:13:01 +, KeyTag 14645, Signer-Name: oigpower.cz


	CNAME-Query sends a valid NSEC3 RR as result with the hashed query name "o9602ltg5c8a50kl9ro0hkevnp73mi67" equal the hashed NSEC3-owner "o9602ltg5c8a50kl9ro0hkevnp73mi67" and the hashed NextOwner "oeqllpsm2u5ldl32jitovp132n2u9kb3". So the zone confirmes the not-existence of that CNAME RR, but the existence of that query name (minimal one RR with that name exists). Bitmap: A, RRSIG Validated: RRSIG-Owner o9602ltg5c8a50kl9ro0hkevnp73mi67.oigpower.cz., Algorithm: 10, 3 Labels, original TTL: 3600 sec, Signature-expiration: 15.03.2026, 14:43:01 +, Signature-Inception: 13.02.2026, 13:13:01 +, KeyTag 14645, Signer-Name: oigpower.cz


	Status: Good. NoData-Proof required and found.


	TXT-Query sends a valid NSEC3 RR as result with the hashed query name "o9602ltg5c8a50kl9ro0hkevnp73mi67" equal the hashed NSEC3-owner "o9602ltg5c8a50kl9ro0hkevnp73mi67" and the hashed NextOwner "oeqllpsm2u5ldl32jitovp132n2u9kb3". So the zone confirmes the not-existence of that TXT RR, but the existence of that query name (minimal one RR with that name exists). Bitmap: A, RRSIG Validated: RRSIG-Owner o9602ltg5c8a50kl9ro0hkevnp73mi67.oigpower.cz., Algorithm: 10, 3 Labels, original TTL: 3600 sec, Signature-expiration: 15.03.2026, 14:43:01 +, Signature-Inception: 13.02.2026, 13:13:01 +, KeyTag 14645, Signer-Name: oigpower.cz


	Status: Good. NoData-Proof required and found.


	AAAA-Query sends a valid NSEC3 RR as result with the hashed query name "o9602ltg5c8a50kl9ro0hkevnp73mi67" equal the hashed NSEC3-owner "o9602ltg5c8a50kl9ro0hkevnp73mi67" and the hashed NextOwner "oeqllpsm2u5ldl32jitovp132n2u9kb3". So the zone confirmes the not-existence of that AAAA RR, but the existence of that query name (minimal one RR with that name exists). Bitmap: A, RRSIG Validated: RRSIG-Owner o9602ltg5c8a50kl9ro0hkevnp73mi67.oigpower.cz., Algorithm: 10, 3 Labels, original TTL: 3600 sec, Signature-expiration: 15.03.2026, 14:43:01 +, Signature-Inception: 13.02.2026, 13:13:01 +, KeyTag 14645, Signer-Name: oigpower.cz


	Status: Good. NoData-Proof required and found.


	TLSA-Query (_443._tcp.portal.oigpower.cz) sends a valid NSEC3 RR as result with the hashed owner name "o9602ltg5c8a50kl9ro0hkevnp73mi67" (unhashed: portal.oigpower.cz). So that's the Closest Encloser of the query name. Bitmap: A, RRSIG Validated: RRSIG-Owner o9602ltg5c8a50kl9ro0hkevnp73mi67.oigpower.cz., Algorithm: 10, 3 Labels, original TTL: 3600 sec, Signature-expiration: 15.03.2026, 14:43:01 +, Signature-Inception: 13.02.2026, 13:13:01 +, KeyTag 14645, Signer-Name: oigpower.cz


	Status: Good. NXDomain-Proof required and found.


	TLSA-Query sends a valid NSEC3 RR as result and covers the hashed Next Closer Name "j2fq4145bacautv1llj651g4q1j27hlp" (unhashed: _tcp.portal.oigpower.cz) with the owner "fe70mj7ftc3c4k4eb244edcqjj4852da" and the NextOwner "kfnakmvtdg86froc0n71ik4nh7i61pco". So that NSEC3 confirms the not-existence of the Next Closer Name. TLSA-Query sends a valid NSEC3 RR as result and covers the hashed Wildcard expansion of the ClosestEncloser "fkeqsfk904urv075j4ihl89h73brbju1" (unhashed: *.portal.oigpower.cz) with the owner "fe70mj7ftc3c4k4eb244edcqjj4852da" and the NextOwner "kfnakmvtdg86froc0n71ik4nh7i61pco". So that NSEC3 confirms the not-existence of the Wildcard expansion. Bitmap: A, RRSIG Validated: RRSIG-Owner fe70mj7ftc3c4k4eb244edcqjj4852da.oigpower.cz., Algorithm: 10, 3 Labels, original TTL: 3600 sec, Signature-expiration: 15.03.2026, 14:43:01 +, Signature-Inception: 13.02.2026, 13:13:01 +, KeyTag 14645, Signer-Name: oigpower.cz


	Status: Good. NXDomain-Proof required and found.


	CAA-Query sends a valid NSEC3 RR as result with the hashed query name "o9602ltg5c8a50kl9ro0hkevnp73mi67" equal the hashed NSEC3-owner "o9602ltg5c8a50kl9ro0hkevnp73mi67" and the hashed NextOwner "oeqllpsm2u5ldl32jitovp132n2u9kb3". So the zone confirmes the not-existence of that CAA RR, but the existence of that query name (minimal one RR with that name exists). Bitmap: A, RRSIG Validated: RRSIG-Owner o9602ltg5c8a50kl9ro0hkevnp73mi67.oigpower.cz., Algorithm: 10, 3 Labels, original TTL: 3600 sec, Signature-expiration: 15.03.2026, 14:43:01 +, Signature-Inception: 13.02.2026, 13:13:01 +, KeyTag 14645, Signer-Name: oigpower.cz


	Status: Good. NoData-Proof required and found.

Zone: www.portal.oigpower.cz
www.portal.oigpower.cz	0 DS RR in the parent zone found


	DS-Query in the parent zone has a valid NSEC3 RR as result with the hashed query name "k7q6uidrgaao252o7a7p8mg4qv3ncbp5" between the hashed NSEC3-owner "fe70mj7ftc3c4k4eb244edcqjj4852da" and the hashed NextOwner "kfnakmvtdg86froc0n71ik4nh7i61pco". So the parent zone confirmes the not-existence of a DS RR. Bitmap: A, RRSIG Validated: RRSIG-Owner fe70mj7ftc3c4k4eb244edcqjj4852da.oigpower.cz., Algorithm: 10, 3 Labels, original TTL: 3600 sec, Signature-expiration: 15.03.2026, 14:43:01 +, Signature-Inception: 13.02.2026, 13:13:01 +, KeyTag 14645, Signer-Name: oigpower.cz


	DS-Query in the parent zone sends valid NSEC3 RR with the Hash "o9602ltg5c8a50kl9ro0hkevnp73mi67" as Owner. That's the Hash of "portal.oigpower.cz" with the NextHashedOwnerName "oeqllpsm2u5ldl32jitovp132n2u9kb3". So that domain name is the Closest Encloser of "www.portal.oigpower.cz". Opt-Out: False. Bitmap: A, RRSIG Validated: RRSIG-Owner o9602ltg5c8a50kl9ro0hkevnp73mi67.oigpower.cz., Algorithm: 10, 3 Labels, original TTL: 3600 sec, Signature-expiration: 15.03.2026, 14:43:01 +, Signature-Inception: 13.02.2026, 13:13:01 +, KeyTag 14645, Signer-Name: oigpower.cz


	The ClosestEncloser says, that "*.portal.oigpower.cz" with the Hash "fkeqsfk904urv075j4ihl89h73brbju1" is a possible Wildcard of the DS Query Name. But the DS-Query in the parent zone sends a valid NSEC3 RR With the owner "fe70mj7ftc3c4k4eb244edcqjj4852da" and the Next Owner "kfnakmvtdg86froc0n71ik4nh7i61pco", so the Hash of the wildcard is between these hashes. So that NSEC3 proves the Not-existence of that wildcard expansion. Opt-Out: False. Bitmap: A, RRSIG Validated: RRSIG-Owner fe70mj7ftc3c4k4eb244edcqjj4852da.oigpower.cz., Algorithm: 10, 3 Labels, original TTL: 3600 sec, Signature-expiration: 15.03.2026, 14:43:01 +, Signature-Inception: 13.02.2026, 13:13:01 +, KeyTag 14645, Signer-Name: oigpower.cz

3. Name Servers

Domain	Nameserver	NS-IP
www.portal.oigpower.cz	• ns.forpsi.net
portal.oigpower.cz	• ns.forpsi.net / dns-forpsi-slave-1.forpsi.org	81.2.194.130 Prague/Czechia (CZ) - INTERNET CZ	•
	•	2001:15e8:101:1::c282 Ktiš/Jihočeský kraj/Czechia (CZ) - INTERNET CZ	•
oigpower.cz	• ns.forpsi.cz / dns-forpsi-slave-2.forpsi.org	81.2.209.185 Prague/Czechia (CZ) - INTERNET CZ	•
	•	2001:15e8:201:1::d1b9 Ktiš/Jihočeský kraj/Czechia (CZ) - INTERNET CZ	•
	• ns.forpsi.it / dns-forpsi-slave-3.forpsi.org	95.110.254.165 Ponte San Pietro/Lombardy/Italy (IT) - Aruba S.p.A. Network	•
	•	2a00:6d41:2:1::5 Arezzo/Tuscany/Italy (IT) - Aruba S.p.A. Network	•
	• ns.forpsi.net / dns-forpsi-slave-1.forpsi.org	81.2.194.130 Prague/Czechia (CZ) - INTERNET CZ	•
	•	2001:15e8:101:1::c282 Ktiš/Jihočeský kraj/Czechia (CZ) - INTERNET CZ	•
cz	• a.ns.nic.cz / dns-jinx-02.nic.cz		•
	• b.ns.nic.cz / dns-sgix-01.nic.cz		•
	• c.ns.nic.cz / dns-vix-dns01.nic.cz		•
	• d.ns.nic.cz / dns-sgix-02.nic.cz		•

4. SOA-Entries

Domain:	cz
Zone-Name:	cz
Primary:	a.ns.nic.cz
Mail:	hostmaster.nic.cz
Serial:	1771044452
Refresh:	900
Retry:	300
Expire:	604800
TTL:	900
num Entries:	4

Domain:	oigpower.cz
Zone-Name:	oigpower.cz
Primary:	ns.forpsi.net
Mail:	admin.forpsi.com
Serial:	2026021302
Refresh:	14400
Retry:	3600
Expire:	2592000
TTL:	3600
num Entries:	6

Domain:	portal.oigpower.cz
Zone-Name:	oigpower.cz
Primary:	ns.forpsi.net
Mail:	admin.forpsi.com
Serial:	2026021302
Refresh:	14400
Retry:	3600
Expire:	2592000
TTL:	3600
num Entries:	2

Domain:	www.portal.oigpower.cz
Zone-Name:
Primary:
Mail:
Serial:
Refresh:
Retry:
Expire:
TTL:
num Entries:	1

5. Screenshots

No Screenshot listed, because no url-check with https + http status 200-299, 400-599 + not-ACME-check found.

6. Url-Checks

Domainname	Http-Status	Sec.	G
• http://portal.oigpower.cz/ 178.238.45.4	-14	10.017	T
Timeout - The operation has timed out.

• https://portal.oigpower.cz/ 178.238.45.4	-14	10.027	T
Timeout - The operation has timed out.

• http://portal.oigpower.cz/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de 178.238.45.4	-14	10.023	T
Timeout - The operation has timed out.
Visible Content:

• https://178.238.45.4/ 178.238.45.4	-14	10.020	T
Timeout - The operation has timed out.

7. Comments

	1. General Results, most used to calculate the result
A	name "portal.oigpower.cz" is subdomain, public suffix is ".cz", top-level-domain is ".cz", top-level-domain-type is "country-code", Country is Czechia, tld-manager is "CZ.NIC, z.s.p.o", num .cz-domains preloaded: 2337 (complete: 276475)
A	Good: All ip addresses are public addresses
	Warning: Only one ip address found: portal.oigpower.cz has only one ip address.
	Warning: No ipv6 address found. Ipv6 is the future with a lot of new features. So every domain name should have an ipv6 address. See https://en.wikipedia.org/wiki/IPv6: portal.oigpower.cz has no ipv6 address.
A	Good: No asked Authoritative Name Server had a timeout
A	DNS: "Name Error" means: No www-dns-entry defined. This isn't a problem
	HSTS-Preload-Status: unknown. Domain never included in the Preload-list. Check https://hstspreload.org/ to learn some basics about the Google-Preload-List.
	Info: Checking the ip addresses of that domain name not exact one certificate found. So it's impossible to check if that domain requires Server Name Indication (SNI).: Domain portal.oigpower.cz, 1 ip addresses.
B	No _mta-sts TXT record found (mta-sts: Mail Transfer Agent Strict Transport Security - see RFC 8461). Read the result of server-daten.de (Url-Checks, Comments, Connections and DomainServiceRecords) to see a complete definition. Domainname: _mta-sts.portal.oigpower.cz
	2. Header-Checks
U			No https result with http status 2 or 4 (standard-check) found, no header checked.
	3. DNS- and NameServer - Checks
A	Info:: 6 Root-climbing DNS Queries required to find all IPv4- and IPv6-Addresses of 3 Name Servers.
A	Info:: 6 Queries complete, 6 with IPv6, 0 with IPv4.
A	Good: All DNS Queries done via IPv6.
A	Good: Some ip addresses of name servers found with the minimum of two DNS Queries. One to find the TLD-Zone, one to ask the TLD-Zone.ns.forpsi.cz (2001:15e8:201:1::d1b9, 81.2.209.185), ns.forpsi.it (2a00:6d41:2:1::5, 95.110.254.165), ns.forpsi.net (81.2.194.130)
A	Good (1 - 3.0):: An average of 2.0 queries per domain name server required to find all ip addresses of all name servers.
A	Info:: 3 different Name Servers found: ns.forpsi.cz, ns.forpsi.it, ns.forpsi.net, 3 Name Servers included in Delegation: ns.forpsi.cz, ns.forpsi.it, ns.forpsi.net, 3 Name Servers included in 1 Zone definitions: ns.forpsi.cz, ns.forpsi.it, ns.forpsi.net, 1 Name Servers listed in SOA.Primary: ns.forpsi.net.
A	Good: Only one SOA.Primary Name Server found.: ns.forpsi.net.
A	Good: SOA.Primary Name Server included in the delegation set.: ns.forpsi.net.
A	Good: Consistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Ordered list of name servers: ns.forpsi.cz, ns.forpsi.it, ns.forpsi.net
A	Good: All Name Server Domain Names have a Public Suffix.
A	Good: All Name Server Domain Names ending with a Public Suffix have minimal one IPv4- or IPv6 address.
A	Good: All Name Server ip addresses are public.
A	Good: Minimal 2 different name servers (public suffix and public ip address) found: 3 different Name Servers found
A	Good: All name servers have ipv4- and ipv6-addresses.: 3 different Name Servers found
A	Good: Name servers with different Top Level Domains / Public Suffix List entries found: 3 Name Servers, 3 Top Level Domains: it, cz, net
A	Good: Name Servers with different domain names found.: 3 different Domains found
A	Good: Name servers with different Country locations found: 3 Name Servers, 2 Countries: CZ, IT
A	Info: Ipv4-Subnet-list: 3 Name Servers, 2 different subnets (first Byte): 81., 95., 2 different subnets (first two Bytes): 81.2., 95.110., 3 different subnets (first three Bytes): 81.2.194., 81.2.209., 95.110.254.
A	Good: Name Server IPv4-addresses from different subnet found:
A	Info: IPv6-Subnet-list: 3 Name Servers with IPv6, 2 different subnets (first block): 2001:, 2a00:, 2 different subnets (first two blocks): 2001:15e8:, 2a00:6d41:, 3 different subnets (first three blocks): 2001:15e8:0101:, 2001:15e8:0201:, 2a00:6d41:0002:, 3 different subnets (first four blocks): 2001:15e8:0101:0001:, 2001:15e8:0201:0001:, 2a00:6d41:0002:0001:
A	Good: Name Server IPv6 addresses from different subnets found.
A	Good: Nameserver supports TCP connections: 2 good Nameserver
A	Good: Nameserver supports Echo Capitalization: 2 good Nameserver
A	Good: Nameserver supports EDNS with max. 512 Byte Udp payload, message is smaller: 2 good Nameserver
A	Good: Nameserver has passed 10 EDNS-Checks (OP100, FLAGS, V1, V1OP100, V1FLAGS, DNSSEC, V1DNSSEC, NSID, COOKIE, CLIENTSUBNET): 2 good Nameserver
	Nameserver doesn't pass all EDNS-Checks: ns.forpsi.net: OP100: no result. FLAGS: no result. V1: no result. V1OP100: no result. V1FLAGS: no result. DNSSEC: no result. V1DNSSEC: no result. NSID: no result. COOKIE: no result. CLIENTSUBNET: no result.
A	Good: All SOA have the same Serial Number
	Warning: No CAA entry with issue/issuewild found, every CAA can create a certificate. Read https://en.wikipedia.org/wiki/DNS_Certification_Authority_Authorization to learn some basics about the idea of CAA. Your name server must support such an entry. Not all dns providers support CAA entries.
	4. Content- and Performance-critical Checks
	http://portal.oigpower.cz/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de 178.238.45.4	-14	Fatal: Check of /.well-known/acme-challenge/random-filename has a timeout. Creating a Letsencrypt certificate via http-01 challenge can't work. You need a running webserver (http) and an open port 80. If it's a home server + ipv4, perhaps a correct port forwarding port 80 extern ⇒ working port intern is required. Port 80 / http can redirect to another domain port 80 or port 443, but not other ports. If it's a home server, perhaps your ISP blocks port 80. Then you may use the dns-01 challenge. Trouble creating a certificate? Use https://community.letsencrypt.org/ to ask.
A	Info: No img element found, no alt attribute checked
A	Good: Domainname is not on the "Specially Designated Nationals And Blocked Persons List" (SDN). That's an US-list of individuals and companies owned or controlled by, or acting for or on behalf of, targeted countries. It also lists individuals, groups, and entities, such as terrorists and narcotics traffickers designated under programs that are not country-specific. Collectively, such individuals and companies are called "Specially Designated Nationals" or "SDNs." Their assets are blocked and U.S. persons are generally prohibited from dealing with them. So if a domain name is on that list, it's impossible to create a Letsencrypt certificate with that domain name. Check the list manual - https://www.treasury.gov/resource-center/sanctions/sdn-list/pages/default.aspx
A	Duration: 106163 milliseconds, 106.163 seconds

8. Connections

No connection informations found. Perhaps only http - connections.

9. Certificates

No certificate informations found. Perhaps only http - connections.

10. Last Certificates - Certificate Transparency Log Check

1. Source CertSpotter - active certificates (one check per day)

No CertSpotter - CT-Log entries found

2. Source crt.sh - old and new certificates, sometimes very slow - only certificates with "not after" > of the last months are listed

No CRT - CT-Log entries found

11. Html-Content - Entries

No Html-Content entries found. Only checked if https + status 200/401/403/404

12. Html-Parsing via https://validator.w3.org/nu/

No https result http status 200 and Content-Type text/html or text/xml found, no Html-Parsing - Check

13. Nameserver - IP-Adresses

Required Root-climbing DNS-Queries to find ip addresses of all Name Servers: ns.forpsi.cz, ns.forpsi.it, ns.forpsi.net

QNr.	Domain	Type	NS used
1	cz	NS	h.root-servers.net (2001:500:1::53)
	Answer: a.ns.nic.cz, b.ns.nic.cz, c.ns.nic.cz, d.ns.nic.cz
2	ns.forpsi.cz: 2001:15e8:201:1::d1b9, 81.2.209.185	NS	a.ns.nic.cz (2001:678:f::1)
3	it	NS	k.root-servers.net (2001:7fd::1)
	Answer: a.dns.it, dns.nic.it, m.dns.it, nameserver.cnr.it, r.dns.it, v.dns.it
4	ns.forpsi.it: 2a00:6d41:2:1::5, 95.110.254.165	NS	a.dns.it (2001:678:12:0:194:0:16:215)
5	net	NS	a.root-servers.net (2001:503:ba3e::2:30)
	Answer: a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net, e.gtld-servers.net, f.gtld-servers.net, g.gtld-servers.net, h.gtld-servers.net, i.gtld-servers.net, j.gtld-servers.net, k.gtld-servers.net, l.gtld-servers.net, m.gtld-servers.net
6	ns.forpsi.net: 81.2.194.130	NS	a.gtld-servers.net (2001:503:a83e::2:30)

14. CAA - Entries

Domainname	Value	∑ Queries
portal.oigpower.cz	no CAA entry found	1
oigpower.cz	no CAA entry found	1
cz	no CAA entry found	1

15. TXT - Entries

Domainname	TXT Entry	Status	∑ Queries
oigpower.cz	d7a817a9d17d8c06d2306bd0513a84ef1977d80dddc961f9f1753a2471455f2	ok	1
oigpower.cz	v=spf1 a mx ip4:185.25.185.65 ~all	ok	1
portal.oigpower.cz		ok	1
_acme-challenge.portal.oigpower.cz		Name Error - The domain name does not exist	1
_acme-challenge.portal.oigpower.cz.oigpower.cz	d7a817a9d17d8c06d2306bd0513a84ef1977d80dddc961f9f1753a2471455f2	perhaps wrong	1
_acme-challenge.portal.oigpower.cz.oigpower.cz	v=spf1 a mx ip4:185.25.185.65 ~all	perhaps wrong	1
_acme-challenge.portal.oigpower.cz.portal.oigpower.cz		Name Error - The domain name does not exist	1

16. DomainService - Entries

No DomainServiceEntries entries found

17. Cipher Suites

No results

18. Portchecks

No open Ports <> 80 / 443 found, so no additional Ports checked.

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