Dev & Data Tool

WHOIS & DNS Domain Lookup

Check .com and .co.uk domain expiry details, registrar data, and common DNS records, including A, TXT, CNAME, and MX records.

Supported domains

.com domains through Verisign RDAP.
.co.uk domains through Nominet RDAP.
A, TXT, CNAME, and MX records through DNS.

Privacy note

Lookups are processed on the server for the current request and are not saved by this tool.

Lookup Results

Enter a domain to check registration and DNS records.

Try a domain like example.com or nominet.co.uk to see expiry and DNS results.

How it works

The lookup checks DNS records from the server, then runs a WHOIS-style RDAP query against the relevant registry for registration dates, registrar information, and domain status where available.

This first version supports .com and .co.uk domains so the results can stay clear, useful, and predictable before expanding to more top-level domains.

Some registry fields are optional, so a missing expiry, registrar, or status value usually means the registry did not publish that field in the RDAP response.

What the records mean

A records point a domain at IPv4 addresses used by web servers and services.

MX records list mail servers, with lower priority numbers usually tried first.

TXT records often hold verification, SPF, DKIM, DMARC, and service ownership data.

CNAME records point one hostname at another canonical hostname.

Common domain lookup checks

Check when a .com or .co.uk domain is due to expire.
Confirm whether mail is configured with MX records.
Inspect TXT records used for SPF, DKIM, DMARC, and ownership checks.
See whether a root domain points directly to A records.
Find CNAME records when a hostname points to another service.

WHOIS lookup vs DNS lookup

A WHOIS or RDAP lookup is about the domain registration itself: when it was registered, when it may expire, which registrar manages it, and what registry status values are published.

A DNS lookup is about how the domain works on the internet right now, including where websites point, how email routes, and which verification records have been added.

Showing both together helps when you are checking a domain renewal, investigating an email setup, or confirming a domain is pointed at the right services.

Why expiry dates can vary

Registry data

Expiry dates come from registry RDAP data, which is more structured than classic WHOIS but still varies between registries.

Renewal timing

Renewals, transfers, and registry updates can take time to show everywhere, so treat the result as a practical check rather than a legal record.

Privacy defaults

Personal ownership data is often redacted or withheld, especially for UK domains, so this tool focuses on operational details instead.

Domain lookup FAQ

Which domains does this tool support?

This first version supports .com and .co.uk domains. Other domain endings can be added later once their registry lookup behaviour has been tested.

Is this the same as WHOIS?

It gives a WHOIS-style result, but uses RDAP where possible because RDAP returns structured registry data that is easier to read reliably.

Why is a record missing?

Some domains do not publish every record type. For example, not every domain has MX records, and CNAME records are usually used on subdomains rather than root domains.