1. General Results, most used to calculate the result A name "padron-afip.potenciarsgr.com.ar" is subdomain, public suffix is ".com.ar", top-level-domain is ".ar", top-level-domain-type is "country-code", Country is Argentina, tld-manager is "Presidencia de la Nación – Secretaría Legal y Técnica", num .ar-domains preloaded: 166 (complete: 175327) A Good: All ip addresses are public addresses A Good: Minimal 2 ip addresses per domain name found: padron-afip.potenciarsgr.com.ar has 2 different ip addresses (authoritative). 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: padron-afip.potenciarsgr.com.ar 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 A Good: No cookie sent via http. HSTS-Preload-Status: unknown. Domain never included in the Preload-list. Check https://hstspreload.org/ to learn some basics about the Google-Preload-List. A Good: Some urls with http status 200/404 have a complete Content-Type header (MediaType / MediaSubType + correct charset):0 complete Content-Type - header (1 urls) http://padron-afip.potenciarsgr.com.ar/ 177.234.157.191 Url with incomplete Content-Type - header - missing charset C Error - no version with Http-Status 200 H Fatal error: No https - result with http-status 200, no encryption J Fatal: BitNinja.io found. That tool blocks "check your website". So a complete check isn't possible. Deactivate or remove BitNinja if you want to check your domain. Ask BitNinja why this helpful tool is blocked. Your domain is now 28 days blocked. M http://padron-afip.potenciarsgr.com.ar/ 177.234.157.191 Misconfiguration - main pages should never send http status 400 - 499 X Fatal error: Nameserver doesn't support TCP connection: a.dns.ar / 2801:140::10: Timeout X Fatal error: Nameserver doesn't support TCP connection: ns3.hostinger-ar.com / 162.159.26.118: Refused 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 padron-afip.potenciarsgr.com.ar, 2 ip addresses. 2. Header-Checks (alpha, started 2022-10-23, may be buggy / incomplete) 3. DNS- and NameServer - Checks A Info:: 2 Root-climbing DNS Queries required to find all IPv4- and IPv6-Addresses of 4 Name Servers. A Info:: 2 Queries complete, 2 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.ns1.hostinger-ar.com (31.170.163.241), ns2.hostinger-ar.com (31.220.23.1), ns3.hostinger-ar.com (173.192.183.247), ns4.hostinger-ar.com (31.170.164.249) A Good (1 - 3.0):: An average of 0.5 queries per domain name server required to find all ip addresses of all name servers. A Info:: 4 different Name Servers found: ns1.hostinger-ar.com, ns2.hostinger-ar.com, ns3.hostinger-ar.com, ns4.hostinger-ar.com, 4 Name Servers included in Delegation: ns1.hostinger-ar.com, ns2.hostinger-ar.com, ns3.hostinger-ar.com, ns4.hostinger-ar.com, 4 Name Servers included in 2 Zone definitions: ns1.hostinger-ar.com, ns2.hostinger-ar.com, ns3.hostinger-ar.com, ns4.hostinger-ar.com, 1 Name Servers listed in SOA.Primary: ns1.hostinger-ar.com. A Good: Only one SOA.Primary Name Server found.: ns1.hostinger-ar.com. A Good: SOA.Primary Name Server included in the delegation set.: ns1.hostinger-ar.com. 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: 4 different Name Servers found Warning: No Name Server IPv6 address found. IPv6 is the future, so your name servers should be visible via IPv6.: 4 different Name Servers found Warning: All Name Servers have the same Top Level Domain / Public Suffix. If there is a problem with that Top Level Domain, your domain may be affected. Better: Use Name Servers with different top level domains.: 4 Name Servers, 1 Top Level Domain: com Warning: All Name Servers have the same domain name. If there is a problem with that domain name (or with the name servers of that domain name), your domain may be affected. Better: Use Name Servers with different domain names / different top level domains.: Only one domain name used: hostinger-ar.com A Good: Name servers with different Country locations found: 4 Name Servers, 3 Countries: CA, GB, US A Info: Ipv4-Subnet-list: 4 Name Servers, 2 different subnets (first Byte): 162., 31., 3 different subnets (first two Bytes): 162.159., 31.170., 31.220., 4 different subnets (first three Bytes): 162.159.26., 31.170.163., 31.170.164., 31.220.23. A Good: Name Server IPv4-addresses from different subnet found: A Good: Nameserver supports TCP connections: 1 good Nameserver A Good: Nameserver supports Echo Capitalization: 1 good Nameserver X Nameserver Timeout checking Echo Capitalization: a.dns.ar / 2801:140::10 X Nameserver Timeout checking Echo Capitalization: b.dns.ar A Good: Nameserver supports EDNS with max. 512 Byte Udp payload, message is smaller: 1 good Nameserver X Nameserver Timeout checking EDNS512: a.dns.ar / 2801:140::10 A Good: Nameserver has passed 10 EDNS-Checks (OP100, FLAGS, V1, V1OP100, V1FLAGS, DNSSEC, V1DNSSEC, NSID, COOKIE, CLIENTSUBNET): 1 good Nameserver Nameserver doesn't pass all EDNS-Checks: a.dns.ar / 2801:140::10: OP100: fatal timeout. FLAGS: fatal timeout. V1: fatal timeout. V1OP100: fatal timeout. V1FLAGS: fatal timeout. DNSSEC: fatal timeout. V1DNSSEC: fatal timeout. NSID: fatal timeout. COOKIE: fatal timeout. CLIENTSUBNET: fatal timeout. Nameserver doesn't pass all EDNS-Checks: ns1.hostinger-ar.com: 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. Nameserver doesn't pass all EDNS-Checks: ns3.hostinger-ar.com / 162.159.26.118: OP100: SOA expected, but NOT found, NOERR expectend and NOERR found, Version 0 expectend and found, no OPT100 expected, no OPT100 found. FLAGS: SOA expected, but NOT found, NOERR expectend and NOERR found, Version 0 expectend and found. V1: ok. V1OP100: ok. V1FLAGS: ok. DNSSEC: SOA expected, but NOT found, NOERR expectend and NOERR found, Version 0 expectend and found. V1DNSSEC: ok. NSID: SOA expected, but NOT found, NOERR expectend and NOERR found, Version 0 expectend and found (20m319). COOKIE: SOA expected, but NOT found, NOERR expectend and NOERR found, Version 0 expectend and found. CLIENTSUBNET: ok. A Good: All SOA have the same Serial Number A Good: CAA entries found, creating certificate is limited: letsencrypt.org is allowed to create certificates A Good: CAA entries found, creating certificate is limited: letsencrypt.org is allowed to create wildcard-certificates 4. Content- and Performance-critical Checks A Good: All checked attribute values are enclosed in quotation marks (" or '). 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: 165440 milliseconds, 165.440 seconds