NETWORK TOOLS
SSL certificate checker
Check a website’s SSL certificate: who issued it, when it expires, which names it covers and whether the chain is trusted.
What it shows
The certificate’s issuer, valid dates, days remaining, the names it covers and the certificate chain your server sends.
Common problems
Expired certificates, a name that doesn’t match the website, and missing intermediate certificates, which make some browsers and devices show warnings.
Mail servers too
Choose port 465, 993 or 995 to check certificates on SMTP, IMAP or POP3 servers.
MORE TOOLS
Other network tools
What is my IP?
See your public IP address and its hostname.
DNS lookup
See A, MX, TXT, NS and other records for any domain, or reverse DNS for an IP.
WHOIS lookup
Registrar, expiry date and nameservers for a domain, or the owner of an IP range.
Email health check
Check MX, SPF, DKIM and DMARC in one go, with plain-English fixes.
Blacklist check
See if your mail server is on Spamhaus, Barracuda, SpamCop and other blacklists.
FREE IT REVIEW
Need help with your network or email?
Tell us a little about your business and we'll come back within one working day to arrange a review, on site or over Teams. No hard sell, just a clear picture of where your IT stands.
Prefer to talk? Call 0161 660 7471 or email hello@posilan.com