7 free tools
Network & Email Tools
Check open ports, DNS propagation, email authentication (SPF, DKIM, DMARC), IP blacklists, whether a site is down, and TLS versions.
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Open Port Checker
Check whether a port on your server is reachable from the internet, or scan for databases and admin services that should not be public. -
DNS Propagation Checker
See whether a DNS change has reached 18 public resolvers worldwide, compared with what your domain’s own name servers say. -
Email Deliverability Checker
Check a domain’s mail setup in one go: MX, SPF, DKIM, DMARC, MTA-STS, reverse DNS of the mail servers and a live SMTP test with STARTTLS. -
IP Blacklist Checker
Check whether a server’s IP address is on 15 email and abuse blacklists, with its reverse DNS, network owner and how to get delisted. -
Website Down Checker
Is a site down for everyone or just you? Check it from Cloudhim’s server: DNS, connection, status code, response time and what went wrong. -
TLS Version Checker
See which TLS versions a server accepts (1.0, 1.1, 1.2, 1.3), the cipher for each, and whether it offers HTTP/2, HTTP/3 and HSTS. -
What Is My IP Address
See your public IP address as servers see it, with its reverse DNS name, network (ASN), provider and country.