WHOIS, IP, rDNS, MX: A simple, effective tool for getting all the info on a domain at a glance!
Enter a domain name to obtain all public information about it.
About this domain analysis tool
This tool is a service free and independent, developed entirely by LRob, expert in web security and hosting.
It has been designed to offer everyone - professionals and private individuals alike - an easy-to-use simple, transparent access to public technical information of a domain name: WHOIS, DNS, IP, email configuration, DNSSEC, and much more.
Unlike many commercial services, the is not dependent on any advertising network or registrar.
Its objective is clear: to provide reliable, neutral and privacy-friendly analysis without abusive data collection or compulsory registration.
A free tool designed for transparency and security
Developed by LRob, a WordPress and web infrastructure security specialist, this tool is part of an approach to transparency and digital education.
By making WHOIS and DNS data accessible to all, it allows you to :
- check the ownership and validity of a domain,
- identify DNS servers and associated IP,
- control the mailbox configuration (SPF, DKIM, DMARC),
- and detect possible security or configuration problems.
This open approach makes it easy to diagnose, maintain and understand how domain names work - an essential asset for any web administrator, SEO consultant or curious user.
Why use this tool rather than another?
- 🧩 Independent developed and maintained by LRob, without influence from advertisers or third-party suppliers.
- 🔒 Respectful of privacy no user data is stored or shared.
- ⚙️ Transparent results come directly from public WHOIS and DNS queries.
- 💡 Educational Each section (WHOIS, DNS, email, DNSSEC...) is presented in a clear and understandable way.
- 🌍 Accessible to all No registration required, and the analysis is available for all public domains (.fr, .com, .net, etc.).
In a nutshell
This free domain analysis tool developed by LRob is a a complete, independent and ethical solution to explore and understand the configuration of a website or e-mail service.
Whether you are webmaster, administrator, SEO or advanced user, it helps you to save time, secure your services and better master your digital environment.
Frequently asked questions about the LRob domain analysis tool
Is this domain analysis tool free?
Yes. The tool developed by LRob is entirely free and open to all. It requires no registration, subscription or collection of personal data. It has been designed to offer a useful service to the web community, without advertising or commercial dependence.
What information can I obtain with this tool?
The analysis provides comprehensive information on a : WHOIS, DNS servers, IP addresses, rDNS, DNSSEC, and email configuration (MX, SPF, DKIM, DMARC).
The aim is to provide a clear, practical technical overview for safety diagnostics and audits.
What is the purpose of the LRob domain analysis tool?
This tool provides all public information related to a domain name WHOIS, DNS, IP, rDNS, email configuration (MX, SPF, DKIM, DMARC), DNSSEC, and much more.
It helps you check a site's technical configuration, à detect DNS errors, or to auditing safety and reputation an Internet domain.
It's a tool free, independent and respectful of privacy, developed by LRob, expert in web security and hosting.
Who is this tool for?
The tool is aimed at a wide audience:
System administrators and webmasters, to control the configuration of their servers and domain names.
Messaging managers, to check SPF, DKIM and DMARC compliance and avoid spam.
SEO consultants, to analyze the technical structure of competing domains.
Cybersecurity experts, to audit DNS and detect anomalies.
And curious users, who simply want to know who owns a site or how it's configured.
This tool has been designed to be simple, transparent and accessible to all, without registration or dependence on a third-party service.
Who develops and maintains this tool?
The tool has been developed by LRob, web hosting specialist in WordPress, DNS and web security.
This is a independent, was born out of the need for a comprehensive, fast and privacy-friendly diagnostic tool.
What is the purpose of SPF, DKIM and DMARC records?
These registrations protect your domain against spam and identity theft (phishing). They allow you to check that emails sent from your domain are authorized and authentic.
The LRob tool verifies their presence and validity to reinforce the security of your communications.
What is an MX recording?
Registration MX (Mail eXchanger) indicates the email reception server for a domain. Without this entry in the DNS zone, a domain cannot receive e-mails.
At LRob, MX servers always point to a domain name (FQDN), and not a direct IP address. Example:MX 0 mail.monsite.tld.
This means that emails to @monsite.tld will be received by the server mail.monsite.tld.
What is the purpose of the FQDN, HELO and rDNS?
When a server sends an email, it identifies itself with the message HELO.
To be considered legitimate :
The HELO must be a Valid FQDN (full domain name).
This FQDN must match reverse DNS (rDNS) server IP address.
The rDNS must not be generic (such as ip123.provider.net).
At LRob, servers reject emails with an incorrect HELO to combat spam and compromised servers.
What is SPF registration and what is it used for?
Visit SPF (Sender Policy Framework) is a TXT DNS rule that defines which servers are authorized to send emails for a domain.
Example of an SPF rule used by LRob :v=spf1 +mx include:_spf.lrob.net -all
It means: “only the domain's MX servers and those of LRob can send emails for this domain”.
A well-configured SPF greatly reduces the risk of address spoofing (phishing).
👉 Common errors: having multiple SPF rules or using an unauthorized SMTP server.
What is DKIM?
Visit DKIM (DomainKeys Identified Mail) adds a digital signature to outgoing emails.
This signature is verified by the recipient servers using a public key published in the domain's DNS zone.
This guarantees that the message has not been modified in transit.
At LRob, DKIM can be activated simply via Plesk → Mail settings → DKIM.
Once activated, a TXT entry is automatically added in :default._domainkey.monsite.tld.
What is DMARC?
Visit DMARC (Domain-based Message Authentication, Reporting and Conformance) is a complementary protocol to SPF and DKIM.
It defines how the destination server should react if an email fails both checks (reject, mark as spam, etc.).
Example of a DMARC rule used at LRob :v=DMARC1; p=reject; sp=reject; aspf=s; rua=mailto:dmarcreport@lrob.fr; ruf=mailto:dmarcreport@lrob.fr; rf=afrf; pct=100; ri=172800
This policy rejects non-compliant emails and sends audit reports to the domain administrator.
What is DNSSEC?
Visit DNSSEC (Domain Name System Security Extensions) adds a layer of security to DNS resolution.
It guarantees that DNS responses come from authorized servers and have not been modified.
When DNSSEC is enabled DS (Delegation Signer) and DNSKEY are published.
The LRob tool checks the presence and validity of DNSSEC for each domain analyzed.
What does an A or AAAA input mean?
One entry A associates a domain with an address IPv4 (e.g. A 138.201.17.216).
One entry AAAA associates the domain with an address IPv6 (e.g. AAAA 2a01:4f8:171:28e8::2).
These records determine which machine the website points to or the associated server.
A domain can include both types of entries to ensure IPv4/IPv6 compatibility.
What's the difference between CNAME and A?
A CNAME (Canonical Name) is a DNS alias redirects a sub-domain to another domain name.
For example:www CNAME site.tld.
This means that www.site.tld points to the same address as site.tld.
A recording A, points directly to a IP address.
👉 A CNAME cannot coexist with an A record for the same name.
What is a TXT record in a DNS zone?
Visit TXT records contain textual information interpreted by other services.
They are often used for :
Visit domain ownership checks (Google, Microsoft, etc.)
The rules SPF, DKIM or DMARC
Security features such as “Hosted by LRob”.”
Example:TXT "v=spf1 include:_spf.lrob.net -all"TXT "google-site-verification=abcd1234"
What is CAA registration?
Recordings CAA (Certification Authority Authorization) determine which certification authorities (CAs) are authorized to issue SSL/TLS certificates for your domain.
LRob's default configuration allows Let's Encrypt :CAA 0 issue "letsencrypt.org"
This prevents other authorities from creating an unauthorized certificate for your site.
What is a blacklist and why is it important?
Visit blacklists lists IP addresses associated with the sending of spam.
If a domain's outgoing server is listed, its emails may be rejected or marked as undesirable.
The LRob tool does more than just perform DNS analysis: it can also indicate server reputation and help identify blockages linked to these blacklists.
Why is DNS consistency crucial?
A poorly configured DNS zone (duplicate entries, inconsistent rDNS, multiple SPFs, etc.) can cause :
email sending/receiving errors,
safety issues,
and a general decline in domain reliability.
The LRob analysis tool highlights these inconsistencies, helping to quickly correct common errors.
Is the LRob analysis tool independent?
Yes. The tool is developed and maintained entirely by LRob, without advertising sales or commercial partnerships.
It is based on direct WHOIS and DNS queries, and guarantees neutral, fast and privacy-friendly analysis, and does not store any user data.
How reliable is the LRob tool?
Yes. The results come directly from public WHOIS and DNS queries, without modification or intermediary. The tool focuses on transparency and precision, while remaining independent of any registrar or hosting provider.
Can I analyze any domain?
Yes, you can analyze any public domain name, domain names, whatever their extension (.fr, .com, .net, .org, etc.). The tool relies on official WHOIS databases and DNS servers to provide the available data.
