Free Domain & Network Tools

Professional DNS, SSL, WHOIS, email, and network diagnostic tools for webmasters and system administrators

🔍 Check Domain (WHOIS Lookup)

The most popular tool on CheckDomain.ie - Instantly check domain registration details, availability, and ownership information

Query DNS records (A, AAAA, MX, TXT, NS, etc.)

Check DNS propagation across global servers

Verify SSL/TLS certificates and expiry dates

Validate SPF, DKIM, and DMARC records

Check if your IP is on spam blacklists

Test SMTP, IMAP, and POP3 connectivity

Test network connectivity and DNS resolution

View DNS records and network information

Lookup IP ownership and registration

Calculate network ranges from CIDR notation

View HTTP response and security headers

Test connectivity to common network ports

Measure DNS, TTFB, and load times

Check if your Linux server is vulnerable to CVE-2026-31431