Why Does Ping Fail?
Five real causes of a ping timeout, and how to confirm whether a host is actually down.
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From the blog
What each check does
Host Check Updated
A one-click health check for a domain or an IP address. Loads the site the way a browser would and reports the HTTP status, every redirect, the HTTPS certificate, where the name points in DNS, whether it answers ping, and how long each step took.
Open the website status checker →Ping
Sends small packets to a host and measures how long they take to come back. Useful for spotting outages or high latency.
Open the ping test →DNS Lookup
Shows how a domain resolves and which records are attached. Usually the first thing to check when a domain is pointed wrong.
Open the DNS lookup →Traceroute
Maps the path a request takes across the internet, hop by hop. Useful for diagnosing slow routes or blocked regions.
Open the traceroute tool →WHOIS
Looks up who owns a domain, when it was registered, and when it expires.
Open the WHOIS lookup →SSL Check
Fetches a site's certificate to confirm it's valid, trusted, and not about to expire.
Open the SSL certificate checker →Security Headers New
Checks for the handful of security-related HTTP headers browsers look for, and reports which ones are set.
Open the security headers checker →Blacklists New
Looks up a host's IPv4 address against public spam and abuse blacklists. This is the same signal mail servers use to decide whether to bounce a message.
Open the IP blacklist check →DNS Propagation New
Asks four major public DNS resolvers for a domain's A record side by side, with how long each may keep its answer, to show whether a DNS change has reached them yet.
Open the DNS propagation checker →Email Check New
Checks a domain's SPF and DMARC records, plus common DKIM selectors. The same trio mail servers check before deciding whether to deliver, flag, or reject a message.
Open the email checker →