DNS Spy
Connectivity: 86%
The following nameservers are available and responding correctly for DNS queries for your domain itelco.cz.
| Nameserver | IP address(es) | SOA serial |
|---|---|---|
| dns.itelco.cz. | 217.11.242.62 | 2025011701 |
| dns2.itelco.cz. | 93.185.100.244 | 2025011701 |
| dns3.itelco.cz. | 85.132.152.123 | 2025011701 |
We detected the following errors or warnings about your DNS configuration. These caused your DNS rating to be lowered. Resolving these will grant a higher DNS Spy rating for your domain.
- No IPv6 reachable nameservers were found. Users on IPv6-only networks are unable to reach you.
We could not find any recommendations at this time.
Good news, we detected the following achievements in your DNS configuration. Each of these checks has increased your DNS Spy score.
- All nameservers reply with the same SOA serial number.
- The nameserver IPs are distributed across multiple subnets.
- All nameservers are online.
- Nameservers are available over IPv4.
Performance: 100%
We tested each nameserver and measured the following response times.
| Nameserver | IP address(es) | Response time |
|---|---|---|
| dns.itelco.cz. | 217.11.242.62 | 1ms |
| dns2.itelco.cz. | 93.185.100.244 | 1ms |
| dns3.itelco.cz. | 85.132.152.123 | 1ms |
Good news, no warnings or errors were found.
We could not find any recommendations at this time.
Good news, we detected the following achievements in your DNS configuration. Each of these checks has increased your DNS Spy score.
- Nameserver dns.itelco.cz. (217.11.242.62) replied quickly (< 50ms).
- Nameserver dns2.itelco.cz. (93.185.100.244) replied quickly (< 50ms).
- Nameserver dns3.itelco.cz. (85.132.152.123) replied quickly (< 50ms).
Resilience & Security: 100%
These are the locations and providers of your nameservers.
| Nameserver | Location | ISP |
|---|---|---|
| dns.itelco.cz. | IPv4: CZ | AS15685 - CASABLANCA-AS Internet & Collocation Provider, CZ |
| dns2.itelco.cz. | IPv4: CZ | AS43541 - VSHOSTING, CZ |
| dns3.itelco.cz. | IPv4: CZ | AS24641 - FASTER-AS, CZ |
Good news, no warnings or errors were found.
We detected some possible recommendations for you to consider. No penalties were given for these, but resolving them can give you a higher DNS score.
- All IPv4 nameservers appear to be hosted in the same country (CZ). You might want to consider spreading the nameservers geographically.
Good news, we detected the following achievements in your DNS configuration. Each of these checks has increased your DNS Spy score.
- You have more than 1 nameserver.
- The IPv4 nameservers are distributed among multiple providers.
- DNSSEC is enabled.
- CAA records found.
- You are using glue records, this will speed up the initial DNS requests.
DNS records: 100%
Our scans detected the following publicly available DNS records.
| Record | TTL | Value | |
|---|---|---|---|
| A | itelco.cz | 1h | 217.11.242.62 |
| AAAA | itelco.cz | 1h | 2001:1528:132:80::102:c9 |
| CAA | itelco.cz | 1h |
0 issue "comodoca.com" 0 issue "letsencrypt.org" 0 issue "sectigo.com" 0 issuewild "letsencrypt.org" 0 issuewild "sectigo.com" |
| DNSKEY | itelco.cz | 1h |
ZSK | ECDSA Curve P-256 with SHA-256 | 14NJEZBuvyiuHMQqos12KWx4/4DPwmVDBtuByQ33W8tNIT+0frvKqDim we/n3IB3JLUL8x4Z8yB6p/tQNZj7rw== KSK | ECDSA Curve P-256 with SHA-256 | gj4qe7KXacUJ/jET4y1LoJAmytPqMBkEfaTR9uWXHIczcBw92wf3pqTD Zvw2t+oia/GoZtB1v0jaTift5Xwrfg== |
| MX | itelco.cz | 1h | 1 itelco-cz.mail.protection.outlook.com. |
| NS | itelco.cz | 1h |
dns.itelco.cz. dns2.itelco.cz. dns3.itelco.cz. |
| SOA | itelco.cz | 1h | dns.itelco.cz. hostmaster.itelco.cz. 2025011701 3600 3600 3600000 3600 |
| TXT | itelco.cz | 1h |
"MS=ms43234673" "v=spf1 mx a include:spf.protection.outlook.com -all" |
| TXT | _dmarc.itelco.cz | 1h | "v=DMARC1; p=none; pct=100; rua=mailto:[email protected]; ruf=mailto:[email protected];" |
| SRV | _sip._tls.itelco.cz | 1h | 100 1 443 sipdir.online.lync.com. |
| SRV | _sipfederationtls._tcp.itelco.cz | 1h | 100 1 5061 sipfed.online.lync.com. |
| CNAME | *.itelco.cz | 1h | srv-1.itelco.cz. |
| CNAME | autodiscover.itelco.cz | 1h | autodiscover.outlook.com. |
| TXT | default._domainkey.itelco.cz | 1h | "k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDLFszVDa9q4W9xK6necL7BuYOJEARYsJW/NJqurXuf5ZfhlzdaepNI3lfwBsPw2/AGGV+AT/qRY0/zb6davu7LFwO15GX7GuokRWEeJByQopkj8BSFlcbqONjwg04dX8MSluHQbtxXv0Q9XBe902LQYwvKlH7wi+k4+1llo9cBLQIDAQAB;" |
| A | dns.itelco.cz | 1h | 217.11.242.62 |
| A | dns2.itelco.cz | 1h | 93.185.100.244 |
| A | dns3.itelco.cz | 1h | 85.132.152.123 |
| CNAME | enterpriseenrollment.itelco.cz | 1h | enterpriseenrollment.manage.microsoft.com. |
| CNAME | enterpriseregistration.itelco.cz | 1h | enterpriseregistration.windows.net. |
| CNAME | lyncdiscover.itelco.cz | 1h | webdir.online.lync.com. |
| CNAME | mail.itelco.cz | 1h | srv-1.itelco.cz. |
| CNAME | msoid.itelco.cz | 1h | clientconfig.microsoftonline-p.net. |
| CNAME | sip.itelco.cz | 1h | sipdir.online.lync.com. |
| A | support.itelco.cz | 1h | 217.11.242.62 |
| A | www.itelco.cz | 1h | 217.11.242.62 |
| AAAA | www.itelco.cz | 1h | 2001:1528:132:80::102:c9 |
Good news, no warnings or errors were found.
We detected some possible recommendations for you to consider. No penalties were given for these, but resolving them can give you a higher DNS score.
- You have DMARC records configured, but the "p=none" policy only triggers reports to your e-mail address, the receiver is instructed to not take actions.
Good news, we detected the following achievements in your DNS configuration. Each of these checks has increased your DNS Spy score.
- Single MX record but with multiple IPs associated to it.
- The MX record for "itelco.cz" has a long TTL (1h+).
- The NS records have a long TTL (1h+).
- Your SOA serial number follows the best practice YYYYMMDDxx format.
- SPF records have been found.
- SPF records are set up restrictively.
- DMARC records have been found.
- Found a root (apex) DNS record.
- Found a www DNS record.
- Found an IPv6 root DNS record.
- The active nameservers match the NS records.
- The DNS records appear to be RFC compliant.
Have a look at other public DNS scans.