URL to IP Address - DNS Resolver

To find the IP address of a URL, first separate the domain name from the full URL. For example, in https://www.example.com/path, the domain is www.example.com. Then perform a DNS lookup for A records for IPv4 and AAAA records for IPv6. The result may show one IP or several. A URL can include protocol, path, query strings, and ports, but DNS resolves the hostname portion. If a CDN is involved, the IP you see may depend on your resolver location.

To resolve a domain to an IP address, query DNS for its A and AAAA records. A records return IPv4 addresses, while AAAA records return IPv6 addresses. Many domains return multiple addresses for load balancing or high availability. If the domain is an alias, you may see a CNAME first, then final A or AAAA records. For troubleshooting, note the resolver used and the TTL. Different resolvers may show different results during DNS changes, CDN routing, or propagation windows. Save the output.

A domain can have multiple IP addresses for load balancing, failover, CDN delivery, geo-routing, or dual-stack IPv4 and IPv6 support. When several A or AAAA records are returned, clients may choose one based on DNS order, resolver behavior, or application logic. With CDNs, users in different regions may receive different IPs so traffic goes to a nearby edge. This is normal. When troubleshooting, compare results from the user's resolver and a public resolver, and confirm whether all returned IPs are supposed to serve the same application.

An A record maps a domain name to an IPv4 address. For example, www.example.com could have an A record pointing to 93.184.216.34. It is one of the basic DNS record types used when a browser, server, or tool needs to find where an IPv4 service lives. A domain may have multiple A records, or it may use a CNAME that eventually points to A records. For IPv6, the equivalent address record is AAAA, not A. Knowing this helps when diagnosing DNS versus web-server issues.

To check CNAME to IP, resolve the domain and follow the CNAME chain until you reach A or AAAA records. A CNAME is an alias, so it points one name to another name, not directly to an IP address. For example, app.example.com may point to customer.cdn.example.net, which then returns final A and AAAA records. If the chain is broken, too long, or points to an unexpected provider, users may fail to reach the service. Always check the final records, not only the first alias.

To find the IPv6 address of a domain, query the AAAA records. If the domain has IPv6 enabled, the resolver returns one or more IPv6 addresses. If no AAAA record exists, the service may be IPv4-only even if the server or provider supports IPv6 somewhere else. After finding the AAAA record, test connectivity from an IPv6-capable network. DNS alone does not prove the application works. Firewalls, web server bindings, TLS configuration, and routing also need to support IPv6.

DNS lookup may show a different IP address because of caching, CDN routing, round-robin records, resolver location, split-horizon DNS, or recent changes still propagating. Two users can query the same domain and receive different valid responses. TTL controls how long resolvers may cache a record, so old data can remain briefly after a change. In troubleshooting, record which resolver was used, check authoritative DNS when needed, and compare A, AAAA, and CNAME results. The question is not only 'which IP,' but 'which resolver saw it?'