🌐 Domain Health Dashboard
DNS · SSL · Email Security · Availability · Blacklist — one dashboard
About the Domain Health Dashboard
The ToolNestr Domain Health Dashboard is a comprehensive free tool that checks the technical health of any domain name from multiple angles simultaneously. Enter any domain and within seconds you get a DNS analysis, SSL/TLS certificate status, name server information, email security configuration (SPF and DMARC), website availability status, and a blacklist check — all in one place. No sign-up, no API keys, and no browser extensions required.
Domain health is a critical factor for website owners, IT administrators, and SEO professionals. A domain that fails any of these checks can result in email deliverability problems, search engine ranking penalties, security warnings in browsers, or complete inaccessibility for users. Regular domain health monitoring helps you catch and resolve these issues before they affect your visitors or business operations.
DNS and name server checks
The DNS check resolves your domain's A records (IPv4 addresses) and MX records (mail exchange servers). A records are the most fundamental part of DNS — they tell the internet which IP address to connect to when someone types your domain into a browser. Without valid A records, your website is unreachable. MX records determine which mail servers handle email for your domain; missing or misconfigured MX records mean email sent to your domain will fail to deliver. The name server check shows which DNS providers are authoritative for your domain, which is useful for troubleshooting propagation issues after DNS changes.
Email security: SPF and DMARC
SPF (Sender Policy Framework) is a DNS record that lists the mail servers authorised to send email on behalf of your domain. Without SPF, spammers can easily forge your domain in the "From" address of spam and phishing emails, damaging your domain's reputation and causing your legitimate emails to be marked as spam. DMARC (Domain-based Message Authentication, Reporting and Conformance) builds on SPF and DKIM to give domain owners control over how receiving mail servers handle messages that fail authentication. A DMARC policy with a strict enforcement mode tells receiving servers to reject or quarantine forged emails. Both SPF and DMARC records are strongly recommended for any domain that sends email.
SSL/TLS certificate status
The SSL check verifies your domain's HTTPS certificate: whether it is valid, whether it is expired or about to expire, who issued it, and when it expires. A valid SSL certificate is essential for website security — it encrypts data in transit between the browser and server. Browsers display a warning to users when a certificate has expired or is invalid, which dramatically increases bounce rates and erodes visitor trust. The SSL check also identifies whether the certificate is issued by a trusted Certificate Authority, which affects browser trust levels.
Website availability monitoring
The uptime check makes a live request to your domain and reports the HTTP status code and response time. A 200 status means the site is accessible; 3xx codes indicate redirects; 4xx and 5xx codes indicate errors. The response time gives you a basic indication of server performance from the location of the checking server. While this is a single-point-in-time check rather than continuous monitoring, it is useful for quickly confirming whether a domain is accessible and how quickly it responds.
Blacklist check
The blacklist check queries multiple DNS-based blacklists (DNSBLs) to determine whether your domain's IP address has been flagged for sending spam or other abusive behaviour. Being listed on a major blacklist can cause your emails to be rejected by many mail servers and may negatively impact search engine trust signals. If your IP is found on a blacklist, you will need to identify the cause of the listing (usually a compromised server or account sending spam), remediate the issue, and then submit a delisting request to the relevant blacklist operators.
Overall health score
The tool calculates an overall domain health score from 0 to 100 based on the results of all five checks, with each component weighted by its importance to domain health and security. A score of 80 or higher indicates a well-configured domain. Scores below 60 suggest there are significant issues that should be addressed. Each check card is colour-coded green, amber, or red to make it immediately clear which areas need attention. The score updates in real time as each check completes, so you can see the results as they come in rather than waiting for all checks to finish.