DNS Lookup & SSL Checker

Check DNS records and verify SSL certificates for any domain. A, AAAA, MX, CNAME, TXT, NS records + certificate issuer, expiry, and TLS config.

DNS Lookup & SSL Checker: Enter a domain name and click Check. The tool queries DNS servers for all record types (A, AAAA, MX, CNAME, TXT, NS, SOA) and connects to port 443 to verify the SSL certificate — showing issuer, validity dates, days until expiry, TLS protocol, and Subject Alt Names.

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Key Takeaways

DNS records map domain names to IP addresses, mail servers, and other services
A records point to IPv4 addresses; AAAA records point to IPv6
MX records define which mail servers handle email for the domain
SSL certificates should be renewed before expiry to avoid browser warnings
TLS 1.2 or 1.3 is required for modern security standards

What is DNS Lookup & SSL Checker?

DNS Lookup & SSL Checker — A DNS Lookup tool queries Domain Name System servers to retrieve records (A, AAAA, MX, CNAME, TXT, NS, SOA) for any domain, while an SSL Checker verifies the certificate's validity, issuer, expiry date, TLS version, and trust chain.

This tool combines DNS record lookup and SSL certificate verification in one interface. Enter any domain to see all DNS records (A, AAAA, MX, CNAME, TXT, NS, SOA) and full SSL certificate details including issuer, validity period, days remaining, TLS protocol version, fingerprint, and Subject Alternative Names. Used by developers, sysadmins, and SEO professionals to debug DNS configuration and monitor certificate health.

How to Use DNS Lookup & SSL Checker

1
Enter the domain name (e.g., example.com) in the input field. No need to include https:// — it will be stripped automatically.
2
Click 'Check' to run both DNS lookup and SSL verification simultaneously.
3
Switch between the DNS Records and SSL Certificate tabs to view results.
4
Review DNS records for correct configuration and check SSL certificate expiry dates.

Key Features

A record (IPv4) and AAAA record (IPv6) lookup

MX records with priority sorting for email server configuration

CNAME, TXT, NS, and SOA record retrieval

SSL certificate issuer, subject, and validity dates

Days until SSL expiry with color-coded warnings (red < 7 days, yellow < 30 days)

TLS protocol version detection (TLS 1.2, 1.3)

Subject Alternative Names (SAN) list

SHA-256 certificate fingerprint

Combined DNS + SSL check in a single request

Use Cases

Verify DNS records after domain migration or nameserver changes

Check if MX records are correctly configured for email delivery

Monitor SSL certificate expiry dates to prevent outages

Debug DNS propagation issues after record changes

Verify TLS configuration meets security standards

Check SAN entries for wildcard and multi-domain certificates

Audit domain configuration for SEO technical checks

About DNS Lookup & SSL Checker

Understanding DNS Records

A records map a domain to an IPv4 address. AAAA records map to IPv6. MX records define mail servers with priority (lower = preferred). CNAME records create aliases pointing to another domain. TXT records hold verification strings (SPF, DKIM, domain verification). NS records specify authoritative nameservers. SOA records contain zone metadata.

SSL Certificate Health

An SSL certificate encrypts the connection between your server and visitors. Expired certificates cause browser warnings that drive away visitors. Monitor the "Days Remaining" value and renew certificates before they expire. Modern best practice requires TLS 1.2 or 1.3 — older versions (TLS 1.0, 1.1) are deprecated and insecure.

Frequently Asked Questions

What DNS record types can I look up?: A, AAAA, MX, CNAME, TXT, NS, and SOA records for any domain.
How do I check if my SSL certificate is valid?: Enter your domain and the tool connects to port 443, verifies the certificate chain, and shows issuer, expiry date, days remaining, and any configuration issues.
Why are my DNS changes not showing up?: DNS propagation can take up to 48 hours depending on TTL values. Use this tool to check if your records have updated.
Does the SSL checker verify TLS version?: Yes, it reports the TLS protocol version (1.2 or 1.3) negotiated during the connection.
What is a Subject Alternative Name (SAN)?: SAN entries list all domain names covered by a single SSL certificate, including wildcards (*.example.com) and additional domains.

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Use Cases

Verify DNS records after domain migration or nameserver changes

Check if MX records are correctly configured for email delivery

Monitor SSL certificate expiry dates to prevent outages

Debug DNS propagation issues after record changes

Verify TLS configuration meets security standards

Check SAN entries for wildcard and multi-domain certificates

Audit domain configuration for SEO technical checks

Understanding DNS Records

SSL Certificate Health

Frequently Asked Questions

What DNS record types can I look up?

A, AAAA, MX, CNAME, TXT, NS, and SOA records for any domain.

How do I check if my SSL certificate is valid?

Enter your domain and the tool connects to port 443, verifies the certificate chain, and shows issuer, expiry date, days remaining, and any configuration issues.

Why are my DNS changes not showing up?

DNS propagation can take up to 48 hours depending on TTL values. Use this tool to check if your records have updated.

Does the SSL checker verify TLS version?

Yes, it reports the TLS protocol version (1.2 or 1.3) negotiated during the connection.

What is a Subject Alternative Name (SAN)?

SAN entries list all domain names covered by a single SSL certificate, including wildcards (*.example.com) and additional domains.

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DNS Lookup & SSL Checker

Key Takeaways

What is DNS Lookup & SSL Checker?

How to Use DNS Lookup & SSL Checker

Key Features

Use Cases

About DNS Lookup & SSL Checker

Understanding DNS Records

SSL Certificate Health

Frequently Asked Questions

DNS Lookup & SSL Checker

Key Takeaways

What is DNS Lookup & SSL Checker?

How to Use DNS Lookup & SSL Checker

Key Features

Use Cases

About DNS Lookup & SSL Checker

Understanding DNS Records

SSL Certificate Health

Frequently Asked Questions