Hostname lookup
Resolve a hostname to its addresses, and check whether those addresses point back to it.
Address
| Address | Type | Resolves back to |
|---|
Resolved over encrypted DNS by Cloudflare, straight from your browser.
Domande frequenti
Why does one hostname have several addresses?
Large sites answer with several addresses so traffic can be spread between servers, and so a failure of one does not take the site down. Your computer will usually try them in order until one answers. Content delivery networks go further and give different visitors different addresses depending on where they are.
What does "resolves back to" mean?
Whether the address has a reverse record pointing to a name, and whether that name matches what you looked up. Forward and reverse records are maintained separately, so they often disagree. For a website that is perfectly normal; for a mail server a matching pair matters, because receiving servers check it.
What is a CNAME chain?
A CNAME makes one name an alias for another, and the one it points at can itself be an alias. Following the chain to the end is how a resolver finds the actual addresses. Chains are common in front of content delivery networks, where a site points at a provider’s name which points at a regional one.