DNS lookup

Check the A record and IPv4 address of any domain online

An A record links a domain name to an IPv4 address. Enter a domain or a subdomain to see every address it resolves to and how long resolvers cache them.

What the A record shows

A domain can have one A record or several. With several records, resolvers hand out the addresses in turn, and sites use this to spread load between servers.

If the name is an alias, the answer starts with a CNAME record and ends with the A records of the target. The TTL column shows how many seconds resolvers keep each answer.

When you need it

Check where a site points after a move to new hosting
Find the address of an API or a proxy host before you add it to a whitelist
Compare the answer here with your local DNS when a site does not open
Check that a subdomain resolves before you issue an SSL certificate

Questions about DNS records

01Why does a domain return several A records?

The owner spreads visitors across several servers or a CDN. Resolvers rotate the order, so each visitor connects to one of the listed addresses.

02What does it mean if a domain has no A record?

The name may have only an IPv6 address (AAAA), point elsewhere through a CNAME, or have no zone at all. Without an A record the site will not open over IPv4.

03How do I check that a proxy host resolves correctly?

Enter the host name from your proxy list. If the list already holds IP addresses, no lookup is needed. With socks5h the proxy resolves target sites on its side, so your local DNS does not matter.

04Why does the A record show a CDN address instead of my server?

The domain runs through a proxying CDN, such as Cloudflare with the orange cloud. Visitors connect to the CDN servers, and the real IP of your server stays in the CDN settings.

05What does an A record of 0.0.0.0 or 127.0.0.1 mean?

The owner pointed the name at an empty or local address. That closes subdomains that must not open from outside: no site answers at such an address.